approved_construction_details_uk

(1)

Approved Construction Details

for Part L2 (England and Wales) and Part J (Scotland)

Building Regulations & Standards for Conservation of Fuel & Power (Non-Domestic Buildings)

Insurer Approved

Systems

(2)

Part L2: 2002 Conservation of Energy includes four major

changes to traditional insulated metal roofing and cladding.

a. Reduced heat loss by improved U-values and

limits on thermal bridging.

b. Limit on air leakage for building envelope.

c. Measures to quantify the risk of condensation.

d. Certificate or declaration by a suitably qualified

competent person(s) that the as-built roof and walls

comply with the requirements of Part L2.

Architects and designers now need to take an integrated

and holistic design approach to achieve regulatory

compliance.

The design will need to be based on a complete integrated system

solution for roof and/or wall cladding. Kingspan can provide

construction solutions and details to achieve regulatory compliance

with U-values, thermal bridging, air leakage and insulation continuity

to the approved standard suitable for the intended use of the

building e.g. industrial, office, swimming pool, etc.

Architects or designers have to calculate the

a-value (alpha)

for the building envelope to achieve compliance of

a equal to

or less than 0.10 or demonstrate compliance via the alternative

trade off route. In order to make the

a calculation, the

architects or designers as competent person(s) will most likely

need the assistance of the envelope system manufacturer to

provide f and

Y values for the roof and wall cladding design.

Any changes to specification of the cladding after the

a-value

is calculated will mean that the value has to be recalculated.

If the

a-value is too high the design and/or products will have

to be amended to achieve compliance.

The architects or designers have to specify roof and wall

cladding systems which can achieve compliance with the

requirement to minimise heat loss at all junctions or thermal

bridges.

Detailed drawings should be provided for each part of the roof

and wall system, including all junctions, penetrations,

abutments, internal gutters, smoke vents, louvres, soakers,

doors, windows, rooflights, curtain walling, brickwork and floor

slab edge etc.

Kingspan as a roof and wall system manufacturer provide a

comprehensive package of details for which the f,

Y and air

leakage seals have been optimised for differing building uses.

STEP 1 - DESIGN

STEP 3 - TENDER

STEP 2 - BUILDING

CONTROL APPLICATIONS

Building Regulations Compliance in 7 steps

2 Parts L2 and J Project Design,

4 Specification, Construct ion,

Testing & Handover Compliance Checklist

Building Regulations 2000 Part L2

6

Conservation of Fuel & Power (England & Wales)

Building Regulations 2000 Part L2

7

Elemental Method Kingspan Roof & Wall Solutions

Building Standards 1990 Part J

8

6th Amendments: Conservation of Fuel & Power (Scotland)

Building Standards 1990 Part J

9

Elemental Method Kingspan Roof & Wall Solutions

Building Heating Loss through

10 Thermal Bridging

Thermal Bridging & Heat Loss

12 Calculation Example

Air Leakage Risk Areas

14 Standard Construction Details

16 Enhanced Construction Details

50 Two sets of details have been produced to

give the Building Designer flexibility within the

calculation for the total building heat loss.

The decision on the choice of standard or

enhanced

details is taken by the Building

Designer and is determined from the total

building heat loss methodology demonstrated on

pages 10 & 11 of this guide.

A mixture of both standard and

enhanced

details maybe required for some projects.

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Provide a declaration that appropriate design and installation

has been carried out to achieve reasonable conformity.

Alternatively carry out a thermographic survey by competent

person to demonstrate that the insulation is reasonably

continuous over the visible envelope of the building and that

excessive thermal bridging is avoided.

Note: Building Control should be asked to confirm in advance who they consider is competent to complete the various declarations required before the completion certificate is issued.

Failure to achieve regulatory compliance will result in project

handover delays and subsequent rectification costs.

STEP 7 - CONTINUITY

OF INSULATION

Construction Solutions Service

• Industry awareness and education programme

for property investors, agents/advisers, design

teams, constructors, installers and building control.

• Project specific roof and wall system solutions and

construction details for designers, contractors and

installers.

• Contractor and site installer training programme.

• Specialist site service support.

• Independent design - construction,

air leakage testing and infra-red

service available through alliance

with Building Sciences Ltd.

KINGSPAN PARTS L2 & J

SERVICE AND TOOLKIT

www.kingspanpanels.com

All construction details are available in AutoCAD and

DXF format from the Kingspan website.

For further information contact our

Technical Services Department on:

Hotline: 01352 716101

or Email: [email protected]

The duties of competent person(s) may be carried out by the

developer/main contractor from step 4 onwards. The

competent person(s) will be responsible for ensuring that the

approved design is built and that workmanship quality also

achieves compliance. Should alternative roof and wall systems

or products be substituted to that specified it is necessary that

they are fully regulatory compliant.

Kingspan’s construction details have been designed to be

installer friendly and robust so that a high level of workmanship

quality can be achieved combined with fast installation speed.

Materials being installed and workmanship quality will need to

be checked during construction so that the competent

person(s) can provide the required certificate or declaration

following air pressurisation testing and thermographic

inspection survey.

STEP 4 - CONSTRUCTION

STEP 5 - INSPECTION & TESTING

On buildings of any size, an air leakage test has to be carried

out to provide a declaration from a competent person(s) that

the test result demonstrates regulatory compliance.

Alternatively for buildings of less than 1000m

2

_{floor area a}

declaration that appropriate design and installation has been

carried out to achieve conformity to specification for regulatory

compliance.

STEP 6 - AIR TIGHTNESS TESTING

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DESIGN

PRE-TENDER

SPECIFICATION

PARTS L2 & J ELEMENTAL

METHOD REQUIREMENTS

1 Calculation by Elemental method.

2 Select type of roof and wall systems.

3 Select U-Value requirements.

4 Determine insulation continuity integrity.

5 Determine solar gain and rooflight

requirements.

6 Determine cold bridges and heat loss

risk areas.

7 Determine airtightness standard (Part

L2 only).

8 Develop compliant designs and details

for envelope joints, junctions, internal

gutters, penetrations, rooflights and

abutment details.

9 Calculate f-factor value for intended

building use (see Table A) and details

indicated in 8 above.

10 Calculate

Y-values for envelope system

and details indicated in 8 above.

11 Calculate whole building’s

a-value and

check this is within the limits for

building use (see Table B).

12 Determine lifecycle durability

warranties.

• U-Value and insulant integrity

• Airtightness level

• External coatings

• Structural performance

13 Determine design parameters for

heating, ventilation and HVAC system

and subsequent energy usage levels

and operating costs.

1 Specify selected roof and wall system

• Roof products

- Type and reference.

• Wall products

- Type and reference.

• U-Value requirements.

• Thermal and insulation continuity

requirements.

• Solar gain and rooflight

requirements.

• Air tightness requirement

(Part L2 only).

2 Specify ancillary components i.e.

doors, windows, rooflights, gutters,

smoke vents, louvres and soakers etc.

3 Specify f-factor and Y-values for all

junctions, penetrations, abutments,

internal gutters and provide project

specific design solutions, construction

details and specifications.

4 Indicate whole building’s

a-value for

specified envelope system.

5 Specify lifecycle durability

requirements.

6 Agree with building control body that

the design and specification complies

with Part L2 or J requirements and that

the person providing certificates or

declarations for insulation

standards/continuity, air tightness and

testing is suitably qualified and

competent.

7 Incorporate compliant design(s) and

specification(s) into employer’s tender

package.

U-Value Requirements (W/m

2

_K)

Part L2

Part J

(England & Wales)

(Scotland)

Roofs

0.25

0.25 Walls

0.35

0.30 Rooflights

Max 20% Area

2.20 2.20

Max 12% Area*

3.00 3.00

* Rooflights may be permitted up to 12% of roof area at 3.0W/m2_{K however, there is significant risk of}

condensation.

Part L2 Additional Calculation Requirements

• Calculation to assess risk of surface

mould growth and condensation

introduced -

Surface Temperature f-factor.

Internal humidity classes and the

minimum temperature factor necessary

to prevent condensation.

Table A

Humidity Minimum

Class Building Type f value 1 Storage areas 0.30 2 Offices & shops 0.50 3 Dwellings with low occupancy 0.65 4 Dwellings with high occupancy, 0.80

sports halls, kitchens, canteens; buildings heated with un-flued gas heaters

5 Special buildings, e.g. laundries 0.90 breweries, swimming pools

The BS EN 13788 methodology leads to the temperature factors necessary to avoid condensation shown in the table above.

• Calculation to establish extent of heat

losses through thermal bridges at details

-

Y Value (psi).

• Calculation to assess total heat loss

through all thermal bridges

a-value must

not exceed limits stated in BRE

Information Paper 17/01.

Table B

a-value must be less than or equal to:

0.16 domestic buildings

0.10 non-domestic buildings

Part L2 Completed Building

Compliance Testing

Air Leakage Testing Requirements

• Maximum air leakage rate up to

30 September 2003 is 11.5m

3

_/hr/m

2

_{@ 50PA}

• Maximum air leakage rate from

1 October 2003 is 10m

3

_/hr/m

2

_{@ 50PA}

Infra-Red Thermographic Surveys

• Infra-red thermographic report confirming

that insulation “is reasonably

continuous over the whole visible

envelope”. where required.

(5)

1 Obtain from employer or employer

agent(s) project specific Part L2 or J

envelope compliant pre-tender

package which includes:

• U-values, insulation continuity integrity,

cold bridges and heat loss solutions.

• Airtightness standard (Part L2 only).

• Solar gain and rooflight requirements.

• Calculated f-factor and

Y-values for

all junctions, penetrations, abutments,

internal gutters and approved design

and construction details (Part L2 only).

• Calculated whole building’s

a-value

(Part L2 only).

• Parts L2 or J compliant solutions for

doors, windows, rooflights, smoke

vents, louvres, soakers, brickwork,

curtain walling, floor slab and other

elements.

• Windows, doors and other openings

maybe treated as adiabatic junctions.

2 Plan airtightness testing (Part L2 only).

3 No infra-red thermographic testing is

required with Kingspan roof and wall

systems as insulation continuity is

guaranteed within the panels.

4 Agree with building control body prior

to work starting suitably qualified

competent person(s) who can audit

and verify design, sub-contractor’s

workmanship quality and give

certificates or declarations for

insulation/thermal continuity and

airtightness testing (Part L2 only).

5 Select tender list from suitably qualified

roofing and cladding contractor’s .

6 Audit returned bids for Parts L2 or J

compliance prior to contract award.

7 Alternatively

Establish own project specific Part L2

or J compliant design and

specification pre-tender package in

conjunction with a suitably qualified

competent person(s).

1 Obtain from employer or employer

agent(s) Part L2 or J compliant design

and envelope specification package

including:

• Roof products

- Type and reference.

• Wall products

- Type and reference.

• U-values.

• Insulation/thermal continuity solutions.

• Solar gain and rooflight requirements.

• Airtightness requirement

(Part L2 only) and sealing methods.

• f-factor and Y-values for junctions,

penetrations, abutments, internal

gutters, smoke vents, louvres and

soakers etc.

• Whole building’s envelope

a-value.

• Specified doors, windows, rooflights,

internal gutters, smoke vents,

penetrations, soakers, curtain

walling, brickwork and floor slab

edge systems/solutions and details.

2 Any change to selected or specified

system or product will alter system

compliance. Assess and verify

alternative systems/solutions for

compliance.

3 Agree method of compliance with suitably

qualified competent person(s) appointed

by main contractor. Obtain details of

airtightness testing (Part L2 only), insulation

continuity and infra-red thermographic

surveys where appropriate.

4 Agree lifecycle durability warranty

package.

5 Provide site installation team(s) with

project specific construction assembly

specifications, details and instructions/

training to achieve Parts L2 and J

compliant site workmanship quality

standards.

6 Agree site supervision and workmanship

quality control audit requirements.

7 Alternatively

Establish own project specific Part L2

or J compliant design and

specification pre-tender package in

conjunction with a suitably qualified

competent person(s).

1 All Buildings

Suitably qualified competent person(s)

to prepare written report confirming

design, specification and site

workmanship quality compliance with

regard to U-Values, insulation continuity,

limiting thermal bridges and air leakage.

2 Buildings larger than 1,000m

2

_{floor area}

Airtightness test (Part L2 only) in

accordance with CIBSE TM 23, the

whole building envelope has a maximum

air leakage rate of 10m

3

_/hr/m

2

_{@ 50 Pa.}

Note: Until 30 September 2003 reasonable provision in the event that initial airtightness test results are unsatisfactory would be the results of further tests carried out after appropriate remedial work showing:-an improvement of 75% of the difference between the initial test result and the target standard of 10m3_/hr/m2 @ 50 Pa; or, if less demanding a performance no worse than 11.5m3_/hr/m2_{@ 50 Pa.}

3 A suitably qualified person(s) to issue a

certificate or declaration that appropriate

design details and building techniques have

been used and that the work has been

carried out in ways that can be expected to

achieve reasonable conformity with the

specifications that have been approved for

the purpose of compliance with Part L2

.

Alternatively an infra-red thermographic survey of completed building envelope to show that the insulation is reasonably continuous over the whole building envelope by a competent person in accordance with BRE Report 176 and BS EN 13187.

4 CDM - Health and Safety File for the

building including COSHH data sheets

for products incorporated in building

and copies of maintenance

recommendations plus guarantee

certificates.

5 Written report on commissioning of all

HVAC plant and controls by a suitably

qualified competent person(s).

6 Building log-book - the owner and/or

occupier of the building to be provided

with a log-book giving details of the

installed building services plant and

controls, their method of operation and

maintenance and other details that

collectively enable energy consumption

to be monitored and controlled.

7 Buildings less than 1,000m

2

_{floor area}

Air leakage testing is not compulsory on

buildings below 1000m

2

_{floor area}

provided that a suitably qualified

competent person(s) issues the required

certificates or declarations.

MAIN OR DESIGN - BUILD

CONTRACTORS

ROOFING & CLADDING

CONTRACTORS

PROJECT APPROVAL,

TESTING & HANDOVER

(6)

Part L2 Compliance Requirements Effective from 1st April 2002

Standard U-Values of Construction Elements

(U-Value W/m

2

_K)

• Flat roof (not exceeding 10˚) or roof with integral insulation

0.25

• Walls, including basement walls

0.35

• Floors, including ground floors and basement floors

0.25

• Windows, roof windows and personnel doors (area weighted average

2.20 for the whole building), glazing in metal frames

3

• Windows, roof windows and personnel doors (area weighted average

2.00 for the whole building), glazing in wood or PVC frames

3

• Rooflights

4,5

_2.20

• Vehicle and similar large doors

0.70

Boundary Wall & Valley Gutters

0.25

(For pre melt applications 0.35)c Rooflights 2.20d Roofs 0.25 External Side Walls 0.35 Overhanging Eaves or Soffits 0.35

(When soffits are part of a floor 0.25)

Floors

0.25

Vehicle - Large Doors

0.70

Windows & Personnel Doors

2.00a_/2.20b

Notes:

a. If windows have wood or PVC frames.

b. If windows have metal frames.

c. For pre melt gutter specifications obtain building control approval at design stage.

d. Rooflights may be permitted up to 12% of roof area at 3.0W/m

2

_{K by using the ‘Whole building’ or}

‘Carbon emission’ method of calculation, however, there is a significant risk of condensation.

Standard U-Values (W/m

2

_{K) for Insulated Metal Roof & Wall Cladding Systems –}

Elemental Method Part L2

Notes to table:

1. Any part of a roof having a pitch greater or equal to 70° can be considered as a wall.

2. For the sloping parts of a room-in-the-roof constructed as a material alteration, a U-value of 0.30W/m

2

_K

would be reasonable.

3. Display windows, shop entrance doors and similar glazing are not required to meet the standard given in

this table.

4. This standard applies only to the performance of the unit excluding any upstand. Reasonable provision

would be to insulate any upstand, or otherwise isolate it from the internal environment.

(7)

Wall Systems – U-Values

Product

Thickness

Air Leakage*

0.35 W/m

2

_K

_{KS600/900/1000 - MR/EB/FL-S/WV/CX/MM}

_{70mm (0.35 W/m}

2

_K)

_5m

3

_/h/m

2

0.35 W/m

2

_K

_{KS900/1000 Optimo}

_{70mm (0.35 W/m}

2

_K)

_5m

3

_/h/m

2

0.35 W/m

2

_K

_{KS1000 RW}

_{60mm (0.35 W/m}

2

_K)

_5m

3

_/h/m

2

**Notes: *To achieve a building air leakage performance of 10m**

3

_/h/m

2

_{@ 50 Pa, the air leakage performance of the}

roof/wall system has to be lower to allow for leakage at openings/junctions.

Air leakage solutions are available for 2m

3

_/h/m

2

_{, consult Kingspan Technical Services Department.}

Approved Document L2 Compliance – Kingspan Roof and Wall Systems – CFC Free

Roof Systems – U-Values

Product

Thickness

Air Leakage*

Flat roof or roof with integral

KS1000 RW - TS

80mm (0.25 W/m

2

_K)

_5m

3

_/h/m

2

insulation 0.25 W/m

2

_K

KS1000 LP - CR

80mm (0.25 W/m

2

_K)

_5m

3

_/h/m

2

KS500/1000 ZIP Kingzip

90mm (0.25 W/m

2

_K)

_5m

3

_/h/m

2

(8)

Roofs 0.25 External Side Walls 0.30 Floors 0.25

Vehicle - Large Doors

0.70

Windows & Personnel Doors

2.00a_/2.20b

Standard U-Values (W/m

2

_{K) for Insulated Metal Roof & Wall Cladding Systems –}

Elemental Method Part J

Boundary Wall & Valley Gutters

0.25

(For pre melt applications 0.35)c Rooflights 2.20d Overhanging Eaves or Soffits 0.30

(When soffits are part of a floor 0.25)

Part J Compliance Requirements Effective from 4th March 2002

Maximum U-Values of Exposed Building Elements when using the Elemental Method (Note1)

Exposed Building Element

Maximum U-Value (W/m

2

_K)

• Roof (all roof slopes)

0.25

• External Wall (Note 2)

0.30

• Floor

0.25

• Windows, personnel doors and rooflights (area weighted

2.20 average for the whole building) (Note 3), glazing in metal frames (Note 4)

• Windows, personnel doors and rooflights (area weighted

2.00 average for the whole building) (Note 3), glazing in wood or PVC frames

• Vehicle access and similar large doors (Note 5)

0.70 Notes:

a. Windows, personnel doors and rooflights (area weighted average for the whole building), glazing in wood

or PVC frames.

b. Windows, personnel doors and rooflights (area weighted average for the whole building), glazing in

metal frames.

c. For pre melt gutter specifications obtain building control approval at design stage.

d. Rooflights may be permitted up to 12% of roof area at 3.0W/m

2

_{K, by using the ‘Whole building’ or}

‘Carbon emission’ method of calculation, however, there is a significant risk of condensation.

Notes to table:

1. When an element is exposed to the outside via an unheated space, the unheated space may be

disregarded or the U-value of the element calculated using BS EN ISO 13789: 1999.

2. Solid area of element only (i.e. excluding windows, doors and rooflights).

3. For method of calculation, see Appendix E.

4. Metal framed windows have slimmer frames and therefore provide a passive solar benefit, justifying a less

onerous U-value standard.

(9)

Wall Systems – U-Values

Product

Thickness

0.30 W/m

2

_K

_{KS600/900/1000 - MR/EB/FL-S/WV/CX/MM}

_{80mm (0.30 W/m}

2

_K)

0.30 W/m

2

_K

_{KS900/1000 Optimo}

_{80mm (0.30 W/m}

2

_K)

0.30 W/m

2

_K

_{KS1000 RW}

_{70mm (0.30 W/m}

2

_K)

Part J Standards Compliance – Kingspan Roof and Wall Systems – CFC Free

Roof Systems – U-Values

Product

Thickness

0.25 W/m

2

_K

_{KS1000 RW - TS}

_{80mm (0.25 W/m}

2

_K)

KS1000 LP - CR

80mm (0.25 W/m

2

_K)

KS500/1000 ZIP Kingzip

90mm (0.25 W/m

2

_K)

(10)

Introduction

The Amendments to Part L2 of the Building

Regulations 2000 came into force on 1st April 2002.

The amendments require that thermal bridges at

junctions and around openings be minimised (Items

1.9). Two means of meeting this requirement are

described. The first (Item 1.10) requires the use of

standard robust “details and practices independently

demonstrated as being satisfactory.” This option

primarily applies to domestic type constructions. The

second option (Item 1.11) is to prove compliance by

calculation in accordance with BRE Information Paper

IP 17/01 for which MCRMA Technical Report No 14

provides specific guidance for profiled metal roofing

and cladding.

Means of Proving Compliance

A methodology for proving that an acceptable level of

heat loss through thermal bridging in buildings has

been achieved is contained within MCRMA Technical

Paper 14. The methodology is based upon BRE

Information Paper IP 17/01 – Assessing the Effects of

Thermal Bridges at Junctions and Around Openings.

The basic procedure for proving compliance is best

shown using a typical worked example:

The calculation process which should be followed is

as follows:

The total heat loss through each plane element in the

external envelope (including the floor) of the building is

calculated by multiplying the U-value of each element

by the total square meterage (m

2

_{) of that element}

within the building.

The heat loss for each element is then added

together to provide the total heat loss for the plane

elements of the building (Total A).

The linear meterage of thermal bridge junctions within

the external envelope of the building is then

measured/calculated. These junctions include

window/door jambs, eaves details, corner details, cill

details etc. The linear meterage of each junction is

then multiplied by a calculated Y

value (measurement

of linear thermal transmittance) for that specific

junction. This provides the total heat loss through

each junction type for the building. The losses for

each junction are then added together to give the

total heat loss through thermal bridge junctions within

the building (Total B).

To achieve compliance, the total heat loss for the

thermal bridge junctions (Total B) should be equal to

or less than 10% of the total heat loss through the

plane elements of the building (Total A).

Example Building Area U-value Heat Element (m2₎ _(W/m2_K) _Loss

Total Roof Area 2647.00 -

-Roof 2382.30 0.25 595.58

Rooflights (10%) 264.70 2.20 582.34

Total Wall Area 1194.80 -

-Exposed Walls 1164.80 0.35 407.68 Windows & Personnel Doors 14.00 2.00 28.00 Vehicle Unloading Bay Doors 16.00 0.70 11.20 Ground Floor 2400.00 0.25 600.00 Total Heat Loss (A) = 2224.80

Length

Y

-value Heat Detail Junction _(m) _(W/mK) _Loss

A Ridge 120.00 0.01 1.20 B Eaves 120.00 0.31 37.20 C Verge 80.00 1.01 80.80 D Valley Gutter 60.00 1.38 82.80 E1 Cladding Drip 195.00 0.86 167.70 E2 Ground Floor 195.00 0.16 31.20 F Corner 24.00 0.18 4.32

G1Cladding Window or personnel door head 34.00 0.97 32.98 G2 Window Frame Head 30.00 0.04 1.20 G3 Personnel Door Head 4.00 0.04 0.16 H1 Cladding Window Sill 30.00 0.48 14.40 H2 Window Frame Sill 30.00 0.04 1.20 I1 Window & Personnel Door Jambs 20.00 0.80 16.00 I2 Window Frame Jambs 4.00 0.04 0.16 I3 Personnel Door Jambs 16.00 0.04 0.64 J1 Cladding Head to Vehicle Bay Door 4.00 0.68 2.72 J2 Vehicle Unloading Bay Door Head 4.00 0.04 0.16 K1 Cladding Jamb to Vehicle Bay Door 8.00 1.70 13.60 K2 Vehicle Unloading Bay Door Jambs 8.00 0.04 0.32 Total Heat Loss (B) = 488.76

i.e

Heat loss through

thermal bridging (Total B)

Heat loss through the

= must be less than 0.1

plane elements (Total A)

For the example above:

488.76 (Total B)

2224.8 (Total A)

= 0.22

Therefore the example building has failed to comply

through this route as the total heat loss through the

thermal bridges equals 22% of the total heat loss

through the plain elements. If a building fails to comply

two options exist:

60m 40m 6m

STEP 1

STEP 2

STEP 3

(11)

1. Improvements can be made to the junction details

to reduce the levels of heat losses until the 10%

threshold is achieved. In some instances it may not

be possible or economically viable to minimise the

total additional heat losses through the thermal

bridges to this level. This may be particularly true with

some specific building uses (e.g. Warehouses or

Industrial Units) and/or junction detail configurations.

2. Follow the alternative permitted means of

compliance outlined below.

Alternative Means of Proving Compliance

BRE Information Paper 17/01 permits compliance to

be proven via a trade off calculation (paragraph 5.4).

This methodology can provide a significantly easier

route to compliance for many buildings.

If the building in question does not contain the full

allowable percentage of rooflights (20%) and

windows/personnel doors (15% in industrial/storage

buildings or 40% in places of assembly/offices/

shops) and these allowances have not been traded

off elsewhere, then they can be used as a trade off

against heat losses at thermal bridge junctions to

prove overall compliance. Additional improved

thermal standards of envelope plane elements can

also be traded off in this manner.

As the Total B is greater than 10% of Total A in the

example building, then the trade off route should be

followed. The means of proving compliance via this

route is as follows:

A further calculation for the plane element heat losses

should be undertaken for a “notional building” of

identical size and form but which contains the

maximum permissible areas of windows/personnel

doors and rooflights. The areas of opaque roof and

wall elements require to be reduced to allow for the

additional rooflight and window/personnel door areas

within the notional building.

e.g. If the actual building has a total roof area of

1000m

2

_{with 10% rooflights it would break down into}

plane elemental areas of:

900m

2

_{of roof @ U value of 0.25}

100m

2

_{of rooflights @ U value of 2.2}

Total roof area = 1000m

2

With the notional building, the areas of rooflights can

be the maximum permitted 20%.

Therefore the revised elemental areas would be:

800m

2

_{of roof @ U value of 0.25}

200m

2

_{of rooflights @ U value of 2.2}

Total roof area = 1000m

2

A similar trade off would be undertaken for windows

and personnel doors within the wall areas. The total

heat losses for each element are then calculated and

added together to provide the total plane element

losses for the notional building. (Total C).

The total plane element heat loss in the notional

building (Total C) is then multiplied by 1.1. This allows

for the 10% additional heat loss permitted at thermal

bridge junctions and provides the total allowable heat

losses for the notional building (Total D).

For the example building:

Total Allowable Notional Losses (D)

= 3013.57 x 1.1 = 3314.93

The total heat losses for the actual building are

obtained by adding the heat loss through the plane

elements (Total A) and the thermal bridge junctions

(Total B). If A + B (total heat losses for the actual

building) is less than Total D (allowable heat losses for

the notional building) then compliance is proven.

For the example building:

As the total heat losses for the actual building [(A+B)

= 2713.36] are less than the total allowable losses for

notional building [(D) = 3314.93], the building has

complied with the requirements of IP 17/01 and Part

L2 of the Building Regulations.

Conclusion

In many industrial and commercial buildings, the

thermal bridging at junctions will not require any

significant level of improvement over existing practice

in order to prove compliance with IP17/01. This will

be particularly true where the areas of rooflights and

personnel doors/windows are below the maximum

permitted areas within the regulations.

The risk of condensation formation at thermal bridges

is potentially of greater importance and must be

considered. The risk of condensation formation is

related to the building use and the internal surface

temperatures at details. The minimum surface

temperatures at details are defined as ‘f’ factors.

Generic building types have minimum ‘f’ factor

requirements which are laid down in IP17/01 (See

Table A, page 4). Care must be taken to ensure that

the degree of thermal bridging present at a detail

does not lead to an unacceptable ‘f’ factor for the

building use.

For the example building:

Notional Building Area U-value Heat Element (m2₎ _(W/m2_K) _Loss

Total Roof Area 2647.00 -

-Roof 2117.60 0.25 529.40

Rooflights (20%) 529.40 2.20 1164.68

Total Wall Area 1194.80 -

-Exposed Walls 999.58 0.35 349.85 Windows & Personnel Doors (15%) 179.22 2.00 358.44 Vehicle Unloading Bay Doors 16.00 0.70 11.20 Ground Floor 2400.00 0.25 600.00 Total Heat Loss (C) = 3013.57

STEP 4

STEP 5

(12)

Standard Details - Specification: Roof KS1000 RW 80mm - Walls KS1000 MR 70mm

Actual Building - U-values Actual Building -

Y

Values

Area U-value A.U

Object Name Length

Y

Value L.

Y

Element (m2₎ _(W/m2_K) _(W/K) _(m) _(W/mK) _(W/K)

Total Roof Area 2647.00 - - A Ridge 120.00 0.01 1.20

Roof 2382.30 0.25 595.58 B Eaves 120.00 0.31 37.20

Rooflights (10%) 264.70 2.20 582.34 C Verge 80.00 1.01 80.80

Total Wall Area 1194.80 - - D Valley Gutter 0.35 U-Value (2mm Galv. Steel) 60.00 1.38 82.80 Exposed Walls 1164.80 0.35 407.68 E1 Cladding Drip 195.00 0.86 167.70 Windows & Personnel Doors 14.00 2.00 28.00 E2 Ground Floor* 195.00 0.16 31.20 Vehicle Unloading Bay Doors 16.00 0.70 11.20 F Corner 24.00 0.18 4.32 Ground Floor 2400.00 0.25 600.00 G1Cladding Window or Personnel Door Head 34.00 0.97 32.98 Actual SA.U = 2224.80 G2 Window Frame Head* 30.00 0.04 1.20

G3 Personnel Door Head* 4.00 0.04 0.16

Total Heat Loss for Actual Building 2713.36

H1 Cladding Window Sill 30.00 0.48 14.40

Notional Building - U-values H2 Window Frame Sill* 30.00 0.04 1.20

Area U-value A.U I1 Window & Personnel Door Jambs 20.00 0.80 16.00

Element (m2₎ _(W/m2_K) _(W/K) _{I2 Window Frame Jambs*} _4.00 _0.04 _0.16

Total Roof Area 2647.00 - - I3 Personnel Door Jambs* 16.00 0.04 0.64 Roof 2117.60 0.25 529.40 J1 Cladding Head to Vehicle Bay Door 4.00 0.68 2.72 Rooflights (20%) 529.40 2.20 1164.68 J2 Vehicle Unloading Bay Door Head* 4.00 0.04 0.16 Total Wall Area 1194.80 - - K1 Cladding Jamb to Vehicle Bay Door 8.00 1.70 13.60 Exposed Walls 999.58 0.35 349.85 K2 Vehicle Unloading Bay Door Jambs 8.00 0.04 0.32 Windows & Personnel Doors (15%) 179.22 2.00 358.44 * Assumed value SL.

Y

= 488.76 Vehicle Unloading Bay Doors 16.00 0.70 11.20 Alpha Value SL..

Y

/Actual SA.U = 0.22 Ground Floor 2400.00 0.25 600.00

Notional SA.U = 3013.57 Vertical panel joints for KS 1000 MR Notional Total Heat Loss inc. 10% = 3314.93 are included within U-Value for the panel

Total Heat Loss Compliance with MCRMA Technical Paper No. 14 = FAILS Notional Building Heat Loss 3314.93 carry out calculation against notional building

Actual Building Heat Loss 2713.36 Compliance (Actual Heat Loss < Notional Building) = complies Approved Document L2 40m 60m 6m A D B C E F G H I J K G

Parts L2 & J

To illustrate the relative effect of different components,

junctions and air leakage loss the following has to be

considered at design stage:

• Provide continuity of insulation at junctions, joints,

penetrations and abutment interfaces.

• Prevent missing insulation or gaps.

• Minimise thermal or cold bridges.

Part L2

• Assess condensation and mould growth risk

(surface temperature f-factor).

• Assess impact of thermal bridging throughout

the building envelope, calculate linear thermal

transmissions -

Y-value and calculation of whole

building’s

a-value).

(13)

Enhanced Details - Specification: Roof KS1000 RW 80mm - Walls KS1000 MR 70mm

Actual Building - U-values Actual Building -

Y

Values

Area U-value A.U

Object Name Length

Y

Value L.

Y

Element (m2₎ _(W/m2_K) _(W/K) _(m) _(W/mK) _(W/K)

Total Roof Area 2647.00 - - A Ridge 120.00 0.004 0.48

Roof 2382.30 0.25 595.58 B Eaves 120.00 0.10 12.00

Rooflights (10%) 264.70 2.20 582.34 C Verge 80.00 0.01 0.80

Total Wall Area 1194.80 - - D Valley Gutter* 60.00 0.83 49.80 Exposed Walls 1164.80 0.35 407.68 E1 Cladding Drip 195.00 0.60 117.00 Windows & Personnel Doors 14.00 2.00 28.00 E2 Ground Floor* 195.00 0.16 31.20 Vehicle Unloading Bay Doors 16.00 0.70 11.20 F Corner 24.00 0.01 0.24 Ground Floor 2400.00 0.25 600.00 G1Cladding Window or Personnel Door Head 34.00 0.62 21.08 Actual SA.U = 2224.80 G2 Window Frame Head* 30.00 0.04 1.20

G3 Personnel Door Head* 4.00 0.04 0.16

Total Heat Loss for Actual Building 2474.00

H1 Cladding Window Sill 30.00 0.10 3.00

Notional Building - U-values H2 Window Frame Sill* 30.00 0.04 1.20

Area U-value A.U I1 Window & Personnel Door Jambs 20.00 0.08 1.60

Element (m2₎ _(W/m2_K) _(W/K) _{I2 Window Frame Jambs*} _4.00 _0.04 _0.16

Total Roof Area 2647.00 - - I3 Personnel Door Jambs* 16.00 0.04 0.64 Roof 2117.60 0.25 529.40 J1 Cladding Head to Vehicle Bay Door 4.00 0.62 2.48 Rooflights (20%) 529.40 2.20 1164.68 J2 Vehicle Unloading Bay Door Head* 4.00 0.04 0.16 Total Wall Area 1194.80 - - K1 Cladding Jamb to Vehicle Bay Door 8.00 0.71 5.68 Exposed Walls 999.58 0.35 349.85 K2 Vehicle Unloading Bay Door Jambs 8.00 0.04 0.32 Windows & Personnel Doors (15%) 179.22 2.00 358.44 * Assumed value SL.

Y

= 249.24 Vehicle Unloading Bay Doors 16.00 0.70 11.20 Alpha Value SL..

Y

/Actual SA.U = 0.11 Ground Floor 2400.00 0.25 600.00

Notional SA.U = 3016.57 Notional Total Heat Loss inc. 10% = 3314.93

Total Heat Loss Compliance with MCRMA Technical Paper No. 14 = FAILS Notional Building Heat Loss 3314.93 carry out calculation against notional building

Actual Building Heat Loss 2474.00 Compliance (Actual Heat Loss < Notional Building) = complies Approved Document L2 40m 60m 6m

A

B

C

E

F

G

H

I

J

K

G

D

(14)

40m 60m 6m

A

B

C

E

F

G

H

I

J

K

G

Parts L2 & J

To illustrate the relative effect of different components,

junctions and air leakage loss the following has to be

considered at design stage:

• Limit air leakage loss within the envelope fabric

and at junctions, joints, penetrations and abutment

interfaces to comply with regulatory requirements.

• Roof and wall cladding air leakage will be required

to be less than that indicated in Part L2 as the

regulations refers to the whole building air leakage

level. i.e. including doors, windows, dado walls and

floor slab junctions.

• The air leakage performance of Kingspan’s roof

and wall panels is 5m

3

_/hr/m

2

_{when installed to}

specification.

The

red lines

highlight the air leakage risk

areas where air seals are required

(15)

(16)

Two sets of details have been produced to give the Building Designer flexibility within the calculation for

the total building heat loss.

The decision on the choice of standard or

enhanced

details is taken by the Building Designer and is determined

from the total building heat loss methodology demonstrated on pages 10 & 11 of this guide.

A mixture of both standard and

enhanced

details maybe required for some projects.

KS1000 RW Roof Systems Standard Details

Panel End Lap Detail

17 Ridge Detail

17 Parapet Details - Boundary Wall Gutter

18-19

Eaves Details - External Gutter

20 Verge Details - Wall Cladding

21-22

Valley Gutter Detail

23 Valley Hip Detail

24 Hip Detail

24 End Lap Detail (Panel to GRP Rooflight)

25 End Lap Detail (GRP Rooflight to Panel)

25 Rooflight Intermediate Detail

26 Rooflight Side Lap - Fastener Location Detail

26 KS1000 LP Roof Systems Standard Details

Panel End Lap Detail

27 Ridge Detail

27 Parapet Details - Boundary Wall Gutter

28-29

Eaves Details - External Gutter

30 Valley Gutter Detail

31 Valley Hip Detail

32 Hip Detail

32 Verge Details - Wall Cladding

33-34

Barrel Vault End Lap Details

35 Barrel Vault Side Lap Detail

36 End Lap Detail (Panel to GRP Rooflight)

37 End Lap Detail (GRP Rooflight to Panel)

37 Rooflight Intermediate Detail

38 Rooflight Side Lap - Fastener Location Detail

38 KS1000 RW Wall (Vertically Laid) Systems Standard Details

Drip Detail

39 External Corner Detail

39 Window Head and Cill Detail

40 Window Jamb Detail & Alternative Option Detail

40 Personnel Door Detail (Door head panel site cut)

41 Door Jamb & Door Head Detail

41 Up and Over Door Head Detail

42 Door Jamb Detail

42 KS1000 MR/EB/FL-S/MM/CX/WV Wall (Horizontally Laid) Systems Standard Details

External Corner Detail

43 Vertical Joint Details

44 Window Head and Cill Detail

45 Window Jamb Detail

45 Personnel Door Detail - (Door head panel site cut)

46 Door Jamb & Door Head Detail

46 Drip Detail - Above Floor Level & Below Floor Level

47 Up and Over Door Head Detail

48

(17)

150mm

Nominal 10mm Max. 20mm

50mm

Min. 10mm

3 runs of 4mm Ø butyl rubber sealant (Site applied)

Purlin Fixing screw

KS1000 RW/LPCB roof panel

PANEL END LAP DETAIL

Internal ridge flashing with 150mm overlap sealed with air seal, Vapourflex or gun-grade sealant

Purlin

Air seal - 8mm Ø butyl rubber sealant

RIDGE DETAIL

KS1000 RW/LPCB insulated roof panel Profiled filler sealed top and

bottom with gun-grade sealant Ridge flashing with 150mm sealed butt straps

Profiled filler set back 80 to 100mm to prevent bird attack Mineral fibre insulation site applied

Building Regulations Part L2 Thermal Data fmin= 0.97

Y

= 0.01 W/mK

The above values are only applicable to the components on this detail. Changes to the components will have an effect on the given values.

Max. 50mm

(18)

PARAPET DETAIL - BOUNDARY WALL GUTTER

35mm Min

60mm

Parapet flashing with 150mm sealed butt straps

Parapet rail with air seal, Vapourflex tape to rail joints Mineral fibre insulation site applied Butyl rubber sealant

Profiled filler sealed top and bottom with gun-grade sealant

Sheeting rail

Mineral fibre insulation site applied

Purlin

Gutter outlet Eaves beam gutter support

Building Regulations Part L2 Thermal Data 0.25 W/m2_{K gutter fmin}_{= 0.48}

_Y

_{= 1.63 W/mK} 0.35 W/m2_{K gutter fmin}_{= 0.48}

_Y

_{= 1.72 W/mK}

0.35 sole width 300mm and depth 150mm, values for other widths available on request. The above values are only applicable to the components on this detail. Changes to the components will have an effect on the given values.

KS1000 RW/LPCB insulated roof panel

2mm external non-thermally broken factory made gutter with PIR insulation to 0.25 or 0.35 W/m2_{K U-value} KS1000 RW/ LPCB wall panel vertically laid Profiled filler sealed top and bottom with gun-grade sealant

(19)

PARAPET DETAIL - BOUNDARY WALL GUTTER

35mm Min

60mm

Air seal - 6mm Ø butyl rubber sealant Air seal - 6mm Ø bead of gun-grade sealant

Parapet rail with air seal, Vapourflex tape to rail joints Mineral fibre insulation site applied Butyl rubber sealant

Sheeting rail

Purlin

Gutter outlet Eaves beam gutter support

_Y

_{= 1.72 W/mK}

2mm external non-thermally broken factory made gutter with PIR insulation to 0.25 or 0.35 W/m2_{K U-value} KS1000 RW/ LPCB wall panel vertically laid KS1000 MR/ LPCB wall panel horizontally laid

(20)

Double sided Plastisol “Highline” type gutter

Eaves beam

Mineral fibre insulation site applied 20 mm 35 mm 20 mm

Gutter support 0.7mm thick doubled sided plastisol coated

75mm Approx

200mm fixing centres

EAVES DETAIL - EXTERNAL GUTTER

9mm x 3mm butyl rubber sealant

Air seal - 8mm Ø butyl rubber sealant Air seal - 6mm Ø butyl rubber sealant

*

Y

= 0.27 W/mK

*

Air seal - Vapourflex sealant is to be applied over any breaks in supporting secondary steelwork to give a continuous bearing face.

Double sided Plastisol “Highline” type gutter

Eaves beam

Mineral fibre insulation site applied 20 mm 35 mm 20 mm

Gutter support 0.7mm thick doubled sided plastisol coated

75mm Approx

EAVES DETAIL - EXTERNAL GUTTER

9mm x 3mm butyl rubber sealant

*

Y

= 0.31 W/mK

*

Air seal - Vapourflex sealant is to be applied over any breaks in supporting secondary steelwork to give a continuous bearing face.

(21)

Profiled filler sealed top and bottom with gun-grade sealant Purlin Verge flashing with 150mm sealed butt straps

Cleader angle by steel sub-contractor with air seal - Vapourflex sealant applied at joints

Verge zed support with 150mm sealed overlaps 9mm x 3mm butyl rubber sealant

Direction of Lay

VERGE DETAIL - WALL CLADDING (END OF ROOF SHEETING)

Y

= 1.01 W/mK

(22)

Air seal - 6mm Ø bead of gun-grade sealant 4mm Ø butyl sealant KS1000 MR/ LPCB wall panel horizontally laid Purlin Verge flashing with 150mm sealed butt straps

Direction of Lay

VERGE DETAIL - WALL CLADDING (START OF ROOF SHEETING)

Y

= 1.01 W/mK

Air seal - 6mm Ø bead of gun-grade sealant

4mm Ø butyl sealant KS1000 MR/ LPCB wall panel horizontally laid Purlin

Verge flashing with 150mm sealed butt straps

VERGE DETAIL - WALL CLADDING (END OF ROOF SHEETING)

Mineral fibre insulation site applied Site cut panel to suit

Y

= 1.01 W/mK

(23)

Purlin

Gutter outlet offset to miss stanchion head tie

VALLEY GUTTER DETAIL

_Y

_{= 1.38 W/mK}

Stanchion head tie if necessary as steelwork design

2mm external non-thermally broken factory made galvanised sheet gutter with PIR board insulation to 0.25 or 0.35 W/m2_{K U-value}

(24)

HIP DETAIL

Panels site cut to suit rake angle

Purlin Hip rafter

Internal ridge flashing with 150mm overlap sealed with Vapourflex or gun-grade sealant

Profiled filler set back 80 to 100mm to prevent bird attack Cleader angle by steel

sub-contractor Hip flashing with 150mm sealed butt straps

Rake cut profiled filler sealed top and bottom with gun-grade sealant

Y

= 0.01 W/mK

VALLEY HIP DETAIL

Double sided Plastisol coated flashing

Purlin Hip rafter

Edge protection lacquer applied to all panels cut on site to suit rake angle Cleader angle by steel

sub-contractor

Y

= 0.41 W/mK

2mm external non-thermally broken factory made galvanised sheet gutter with PIR board insulation to 0.25 or 0.35 W/m2_{K U-value}

(25)

150mm Min. end lap

Position of 6 No. main fixings with 29mm Ø washers at end laps

Sealant

5mm expansion gap Triple skin GRP integral

rooflight system

Support bearing plate (Ref: LP2) Silicone or mastic sealant strip at bottom of lap 9mm x 3mm sealant strip or bead either side of fixing

KS1000 RW/LPCB roof panel

150mm Min. end lap

Position of 6 No. main fixings with 29mm Ø washers at end laps

Sealant

5mm expansion gap KS1000 RW/LPCB roof panel

Support bearing plate (Ref: LP2) Silicone or mastic sealant strip at bottom of lap 9mm x 3mm sealant strip or bead either side of fixing

Triple skin GRP integral rooflight system

END LAP DETAIL - (PANEL TO GRP ROOFLIGHT)

(26)

ROOFLIGHT INTERMEDIATE DETAIL

Triple skin GRP integral rooflight system

Position of 6 No. main fixings with 29mm Ø washers

Purlin High density filler

Galvanised steel plate at filler positions for high thread fixing

ROOFLIGHT SIDE LAP - FASTENER LOCATION DETAIL

Direction of Prevailing Wind Direction of Lay

Stitcher screw into aluminium 3mm Ø hole to be drilled prior to fixing/p side lap fixings at 300mm centres KS1000 RW/LPCB roof panel Triple skin GRP

rooflight system

Aluminium strip in underlap 4mm Ø butyl rubber sealant 4mm Ø butyl rubber sealant

Position of main fixings 6 No. with 29mm Ø washers at: i) Ridge

ii) Intermediate iii) End laps

Note: The GRP translucent rooflight illustrated above is generic in detail. Kingspan GRP rooflight details to comply with Part L2 and Part J will be made available later.

(27)

END LAP DETAIL

Continuous run of non-setting gun-grade sealant

End lap stitching plate

Min. of 300mm between panel end lap and cover cap end lap

18mm x 4mm ‘U’ shaped butyl sealant Cover cap complete with

joggle factory applied

Outer sheet turned up with roof slopes below 4˚

Profiled filler sealed top and bottom with gun-grade sealant KS1000 LP/LPCB insulated roof panel

Purlin Profiled filler set back 80 to

100mm to prevent bird attack

Apex dam (Ref: LP1) Cover cap

RIDGE DETAIL

2 No. runs silicone sealant 20mm x 3mm butyl rubber sealant Mineral fibre insulation site applied

Internal ridge flashing with 150mm overlap sealed with Vapourflex or gun-grade sealant

Y

= 0.01 W/mK

Ridge flashing with 150mm sealed butt straps

Max. 50mm

(28)

PARAPET DETAIL - BOUNDARY WALL GUTTER

75mm

35mm Min

60mm

Parapet rail with air seal - Vapourflex tape to rail joints Mineral fibre insulation site applied Butyl rubber sealant

Purlin

Gutter outlet Eaves beam gutter support KS1000 LP/LPCB insulated roof panel

KS1000 RW/ LPCB wall panel vertically laid KS1000 MR/ LPCB wall panel horizontally laid 4mm Ø butyl rubber sealant Sheeting rail Mineral fibre insulation site applied Gun-grade seal at panel joints inline with 8mm butyl Top sheet turned down on site with roof pitches below 4˚

_Y

_{= 1.72 W/mK}

Direction of Lay

2mm external non-thermally broken factory made gutter with PIR insulation to 0.25 or 0.35 W/m2_{K U-value}

(29)

PARAPET DETAIL - BOUNDARY WALL GUTTER

75mm

35mm Min

60mm

Parapet rail with air seal - Vapourflex tape to rail joints Mineral fibre insulation site applied Butyl rubber sealant

Purlin

Gutter outlet Eaves beam gutter support KS1000 LP/LPCB insulated roof panel

KS1000 RW/ LPCB wall panel vertically laid KS1000 RW/ LPCB wall panel vertically laid 4mm Ø butyl rubber sealant Sheeting rail Mineral fibre insulation site applied Gun-grade seal at panel joints inline with 8mm butyl Top sheet turned down on site with roof pitches below 4˚

_Y

_{= 1.72 W/mK}

Direction of Lay

2mm external non-thermally broken factory made gutter with PIR insulation to 0.25 or 0.35 W/m2_{K U-value}

(30)

Mineral fibre insulation site applied Top sheet turned down on site with roof pitches below 4˚ 9mm x 3mm butyl rubber sealant

20 mm 20 mm 35 mm Eaves beam KS1000 MR/LPCB wall panel horizontally laid

75mm Approx

EAVES DETAIL - EXTERNAL GUTTER

Gutter support 0.7mm thick double sided plastisol coated

Double sided plastisol Highline type gutter

Gun-grade seal at panel joints inline with 8mm butyl KS1000 LP/LPCB insulated roof panel Stitching screw fixings for gutter brackets

Y

= 0.31 W/mK

*

Air seal - Vapourflex sealant is to be applied over any breaks in supporting secondary steelwork to give a continuous bearing face.

*

Air seal - 8mm Ø butyl rubber sealant Air seal - 6mm Ø butyl rubber sealant

Mineral fibre insulation site applied Top sheet turned down on site with roof pitches below 4˚ 9mm x 3mm butyl rubber sealant

20 mm 20 mm 35 mm Eaves beam KS1000 RW/ LPCB wall panel vertically laid

75mm Approx

EAVES DETAIL - EXTERNAL GUTTER

Gutter support 0.7mm thick double sided plastisol coated

Double sided plastisol Highline type gutter

Gun-grade seal at panel joints inline with 8mm butyl KS1000 LP/LPCB insulated roof panel Stitching screw fixings for gutter brackets

Y

= 0.27 W/mK

*

Air seal - Vapourflex sealant is to be applied over any breaks in supporting secondary steelwork to give a continuous bearing face.

(31)

75mm

Cover cap

VALLEY GUTTER DETAIL

Purlin Gun-grade seal at panel joints inline with 8mm butyl

Gutter outlet offset to miss stanchion head tie

Air seal - 8mm Ø butyl rubber sealant Stanchion head tie if necessary as steelwork design Air seal - 8mm Ø butyl rubber sealant

_Y

_{= 1.38 W/mK}

Top sheet turned down on site with roof pitches below 4˚ 2mm external non-thermally broken factory made gutter with PIR insulation to 0.25 or 0.35 W/m2_{K U-value}

(32)

Cleader angle by steelwork contractors

Edge protection lacquer applied to all panels cut on site to suit rake angle

Purlin Hip rafter

VALLEY HIP DETAIL

Cover cap

KS1000 LP/LPCB insulated roof panel

Double sided plastisol coated flashing Gun-grade seal at panel joints inline with 8mm butyl

Y

= 0.41 W/mK

2mm external non-thermally broken factory made gutter with PIR insulation to 0.25 W/m2_{K U-value}

HIP DETAIL

20mm x 3mm butyl rubber sealant Cover cap

2 No. runs of silicone sealant Panels site cut to suit rake angle

Apex dam (Ref: LP1/A)

Purlin

Hip rafter Internal ridge flashing with 150mm overlap

sealed with Vapourflex or gun-grade sealant

Cleader angle by steelwork contractor Outer sheet turned up on site with roof pitches below 4˚ Hip flashing with 150mm

sealed butt straps

Rake cut profiled filler sealed top and bottom with gun-grade sealant KS1000 LP/LPCB

insulated roof panel

Y

= 0.01 W/mK