Preservative Treatment Selector

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Issued January 2015

Preservative Treatment Selector

Selecting a timber preservative treatment is an important decision in ensuring a reliable and appropriate preservative treated timber is supplied for a particular project. The choice is dependent on various factors such as the eventual end use location of the treated timber, the final appearance of the treated timber, the availability of ready treated stocks of timber or the dimensional aspects of the timber components which may be affected by a treatment.

Specific details on the choice of treatments by Use Class (EN 335) are available in a separate document.

Following is a summary of the main high and low pressure preservative treatments that best fits your needs with a particular timber component in mind.

1. INTERNAL BUILDING/JOINERY TIMBERS ABOVE DAMP PROOF COURSE

DESCRIPTION USE CLASS TREATMENT OPTIONS

Roof Timbers (dry) UC1

• Pitched roofs • Joists

• Rafters • Sarking

• Purlins • Wall plates

Roof Timbers (hylotrupes / longhorn beetle area) UC1 or UC2

• Pitched roofs (not original) • Joists

Roof Timbers (risk of wetting) UC2

• Flat Roofs • Joists

• Exposed beams • Enclosed beams

• Tiling battens

External Walls/Ground Floor Joists UC2

• Timber frame material • Sole plates

• External walls • Ground floor joists

Specification Clauses are available as separate documents.

Desired Service Life

All these timbers will be treated to a Desired Service Life of 60 years.

Choice of Treatments

The choice of either TANALITH E or VACSOL Aqua treatment will depend to a large extent on the final colour of the treated timber.

TANALITH E treated timber has an initial pale green colouration. VACSOL Aqua treated timber maintains its natural colour.

VACSOL Aqua treatment will also better maintain the dimensional stability of the treated timbers.

1. Internal Building/Joinery Timbers above Damp Proof Course - Click here 2. External Building Timbers above Damp Proof Course - Click here 3. External Joinery - Click here

4. Plywood - Click here

5. Fencing and Outdoor Timbers Above Ground Contact - Click here 6. Fencing and Outdoor Timbers In Ground Contact - Click here 7. Heavy Duty Industrial Timbers - Click here

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1. INTERNAL BUILDING/JOINERY TIMBERS ABOVE DAMP PROOF COURSE (continued)

Treatment Code - UK only

For TANALITH E treated timber, specify TE/BI.

For VACSOL Aqua treated timber, specify VA1.

For TANALITH E treated tiling battens, specify TE/TB.

For TANALITH E treated sole plates, specify TE/BX.

For VACSOL Aqua treated sole plates, specify VA3.

2. EXTERNAL BUILDING TIMBERS ABOVE DAMP PROOF COURSE

Coated Cladding UC3 Coated

Coated Soffits UC3 Coated

Coated Fascia Boards UC3 Coated

Coated Barge Boards UC3 Coated

TANALITH E treated timber can be used externally without the need for a decorative coating but a coating can be added if desired.

VACSOL Aqua treated timber can be used externally but must have an appropriate and well maintained coating applied to maintain the integrity of the preservative protection.

For TANALITH E treated timber, specify TE/BX.

For VACSOL Aqua treated timber, specify VA3.

Uncoated Cladding UC3 Uncoated

Uncoated Soffits UC3 Uncoated

Uncoated Fascia Boards UC3 Uncoated Uncoated Barge Boards UC3 Uncoated

Cedar Shingles UC3 Uncoated

Timbers will be treated to a Desired Service Life of 30 years.

For TANALITH E treated timbers, specify TE/BX.

For TANALITH E treated cedar shingles, specify TE/CS.

For TANALITH E treated cladding, specify TE/GFb.

For TANALITH Extra treated timber, specify TE/BX with water repellent.

For TANATONE treated timber, specify TE/BX with brown colour.

Back to list of timber components.

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3. EXTERNAL JOINERY

Coated Window Frames UC3 Coated

Coated Casements UC3 Coated

Coated Doors UC3 Coated

Coated Door Frames UC3 Coated

Coated Porches UC3 Coated

Coating

VACSOL Aqua treated joinery can be used externally but must have an appropriate and well maintained coating applied to maintain the integrity of the preservative protection.

For VACSOL Aqua treated softwood timbers, specify VA3.

For VACSOL Aqua treated hardwood timbers, specify VA5.

4. PLYWOOD

Plywood - humid grade UC1/2

EN 314 Part 2 bonding class 2

Plywood - exterior grade UC3*

EN 314 Part 2 bonding class 3 or WBP (Weather and Boil Proof)

* VACSOL Aqua treated plywood for UC3 situations must have an appropriate and well maintained coating applied.

TANALITH E treated plywood will be treated to a 60 year Desired Service Life for Use Class 1/2 applications.

TANALITH E treated plywood will be treated to a 15 year Desired Service Life for Use Class 3 applications.

VACSOL Aqua treated plywood will be treated to a 60 year Desired Service Life for Use Class 1/2 applications.

VACSOL Aqua treated plywood will be treated to a 30 year Desired Service Life for Use Class 3 Coated applications.

The choice of either TANALITH E or VACSOL Aqua treatment will depend to a large extent on the final colour of the treated timber.

TANALITH E treated timber has an initial pale green colouration. VACSOL Aqua treated timber maintains its natural colour. VACSOL Aqua treated plywood treated plywood used in Use Class 3 will also require an appropriate and well maintained coating applied to maintain the integrity of the preservative protection.

For TANALITH E treated plywood for Use Class 1/2, specify TE/EPa.

For TANALITH E treated plywood for Use Class 3, specify TE/EPb.

For VACSOL Aqua treated plywood for Use Class 1/2, specify VA3.

For VACSOL Aqua treated plywood for Use Class 3 Coated, specify VA3.

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5. FENCING AND OUTDOOR TIMBER (ABOVE GROUND CONTACT)

Fence Rails UC3 Uncoated

Gates UC3 Uncoated

Post Caps UC3 Uncoated

Decking Components UC3 Uncoated

Farm Buildings UC3 Uncoated

Pergolas UC3 Uncoated

Gazebos UC3 Uncoated

Playground Equipment UC3 Uncoated

All these timbers will be treated to a Desired Service Life of 15 years. A 30 year Desired Service Life is also available - Treatment Code TE/MF.

For built-in extra water repellency, TANALITH Extra treated timber is recommended.

For a built-in brown colouration, TANATONE treated timber is recommended.

For TANALITH E treated timber, specify TE/GFa.

For TANALITH Extra treated timber, specify TE/GFa with water repellent.

For TANATONE treated timber, specify TE/GFa with brown colour.

6. FENCING AND OUTDOOR TIMBERS (IN GROUND CONTACT)

Fence, Gate and Deck Posts UC4

Deck Joists UC4

Garden Sleepers UC4

Agricultural Fencing Timbers UC4

Bridges UC4

Playground Timbers UC4

Retaining Wall Timbers UC4

Fresh Water Contact Timbers UC4

All these timbers will be treated to a Desired Service Life of 15 years. A 30 year Desired Service Life is also available - Treatment Code TE/MF.

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6. FENCING AND OUTDOOR TIMBERS (IN GROUND CONTACT) continued.

For built-in extra water repellency, TANALITH Extra treated timber is recommended.

For a built-in brown colouration, TANATONE treated timber is recommended.

For TANALITH E treated timber, specify TE/GFb.

For TANALITH Extra treated timber, specify TE/GFb with water repellent.

For TANATONE treated timber, specify TE/GFb with brown colour.

7. HEAVY DUTY INDUSTRIAL TIMBERS

Transmission Poles UC4

Railway Sleepers UC4

Highways Fencing (Above Ground) UC3 Uncoated Highways Fencing (In Ground) UC4

Cooling Tower Timbers UC4

For TANALITH E treated Highways Fencing out of ground contact, specify TE/MF.

For TANALITH E treated Highways Fencing in ground contact, specify TE/HD.

For TANALITH E treated Heavy Duty Industrial, specify TE/HD.

DESIRED SERVICE LIFE

The Desired Service Life does not provide a guarantee of performance but an indication of the expectation against which the recommendations for timber treatment are drawn up, assuming good design and normal conditions of use.

Arch Timber Protection (a Lonza company)

Wheldon Road, Castleford, West Yorkshire, WF10 2JT.

Tel: +44 (0)1977 714000 Fax: +44 (0)1977 714001

E-mail: timberprotectionadvice.ukca@lonza.com www.archtimberprotection.com