TOTAL ADD ALTERNATES
TABLE IV LIST OF EQUIPMENT
T. I 1.1 PROJECT MOBILIZATION AND GENERAL CONDITIONS
6.1 ROUGH CARPENTRY
A. Scope of Work
1. Work consists of replacing deteriorated wood nailers and providing new nailers and other wood assemblies as required.
2. Install replacement wood nailers where deteriorated components were removed.
3. Add wood nailers along roof edges and other conditions as directed to accommodate increases in insulation thickness and other roofing replacement conditions.
4. Install new curbs and platforms as necessary to provide a minimum of 8 inch freeboard as required by the membrane manufacturer at removable equipment.
5. For bidding purposes, assume that 10% of existing wood nailers will require replacement.
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1. Lumber, plywood, and other wood accessories as directed.
C. Drawings and Specifications
1. Refer to Sheets R2.0 and R2.1 for location of work. Refer to
specification section “Rough Carpentry” for work requirements, materials, and procedures.
7.1 SUBSTRATE BOARD AND VAPOR BARRIER
A. Scope of Work
1. Work consists of providing a new mechanically fastened substrate board with an adhered asphaltic vapor barrier over areas of metal roof deck, providing a new mechanically fastened cover board only at areas of cementitious wood fiber roof deck, or providing a vapor barrier only at areas of concrete roof deck.
Extents of Installation:
a. CLB Sections E, F, G: Vapor barrier only.
2. Install single-ply modified bitumen membrane in hot asphalt, cold adhesive, or provide a self-adhering sheet to serve as a vapor barrier on top of substrate board. Extend vapor barrier minimum 8-inches up all vertical surfaces. Terminate as directed by sheet manufacturer. Seal all edges and at all penetrations.
3. All membrane materials and accessories shall be VOC compliant. Coordinate with Owner prior to use of solvent based primers to prevent infiltration of odor through intake louvers and the building HVAC systems.
B. Materials
1. Modified bitumen membrane, with hot asphalt, adhesive, fasteners and other accessories.
C. Drawings and Specifications
1. Refer to Sheet R2.0 and R2.1 for locations of work. Refer to Sheets R3.0 through R3.7 for installation details. Refer to specification section “Modified Bituminous Membrane Roofing” for work requirements, materials, and procedures.
7.2 ROOFING INSULATION – POLYISO INSULATION
A. Scope of Work
1. Work consists of providing new fully adhered flat stock polyisocyanurate insulation board at areas sloped roof deck and tapered polyisocyanurate insulation at areas of flat roof deck, along with sumps, crickets, and
JCCC ROOFING REPLACEMENTS TASK ITEMS – CLB E, F, G
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diverters where indicated.
Extents of Installation:
a. CLB Section E, F, G: Flat stock with tapered polyiso.
2. Insulation shall meet following minimum requirements:
a. Minimum insulation = R – 25.0 continuous insulation
Prior to start of work, Contractor shall take field measurements and submit a roof slope plan taking into account all roof curb, penetration, and wall heights for Engineer’s review and approval. After Engineer’s review, modify slope plan as necessary based on existing conditions.
3. Install insulation in a minimum of two fully-adhered layers. Bottom layer shall be minimum 1-1/2-inch thick. Bottom layer of insulation shall be 1/2- inch minimum at roof drains or as needed to tie into height of existing drain bowl.
4. Where tapered insulation is required, top layer shall be tapered polyisocyanurate insulation, fully adhered, at 1/4-inch per foot. Stagger joints between layers of insulation.
5. Install tapered insulation crickets as follows:
a. 1/4-inch per foot tapered insulation at the high side of the rooftop equipment curbs.
b. Other areas as indicated on project plan sheets R2.0 and R2.1.
6. Insulation attachment to substrate shall be designed to resist the wind uplift pressures specified in the General Notes.
7. Provide 48-inch square tapered sumps to the drains. Extend length of sum as needed to accommodate overflow drains were present.
B. Materials
1. Polyisocyanurate insulation, flat stock and tapered, with adhesive and other accessories.
C. Drawings and Specifications
1. Refer to Sheet R2.0 and R2.1 for locations of work. Refer to Sheets R3.0 through R3.7 for installation details. Refer to specification section “Modified Bituminous Membrane Roofing” for work requirements, materials, and procedures.
7.3 PROTECTION BOARD – 1/2-INCH SILICONIZED GYPSUM BOARD
A. Scope of Work
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2. Over the new insulation, install a new 1/2-inch thick protection board, fully adhered to the top layer of insulation board.
3. Protection board attachment to substrate shall meet the wind pressures specified in the General Notes.
B. Materials
1. 1/2-inch siliconized gypsum cover board, with fasteners and other accessories.
C. Drawings and Specifications
1. Refer to Sheet R2.0 and R2.1 for locations of work. Refer to Sheets R3.0 through R3.7 for installation details. Refer to specification section “Modified Bituminous Membrane Roofing” for work requirements, materials, and procedures.
7.4 TWO PLY SBS MODIFIED BITUMEN ROOFING MEMBRANE
A. Scope of Work
1. Work consists of installation of a 2-ply SBS modified bitumen roofing membrane, all membrane flashings, and other accessories.
2. Install modified bitumen base sheet on top of the protection board substrate in accordance with the membrane manufacturer’s instructions. Fully adhere in cold adhesive. Electric heat weld all seams.
3. Install modified bitumen cap sheet in accordance with the membrane manufacturer’s instructions. Fully adhere in cold adhesive to substrate. Electric heat-weld all seams.
Add Alternate: Provide a reflective “cool roofing” membrane cap sheet
only if add alternate pricing is accepted in writing by Owner.
4. Install base flashing per manufacturer’s specifications.
5. Install sacrificial sheet membrane under all pipe, duct, and conduit supports.
6. Membrane attachment to substrate shall meet the wind pressures specified in the General Notes.
5. Install walkway protection layer at locations as shown on the project drawings.
B. Materials
1. Base ply and granulated cap sheet of SBS modified bitumen, with all flashings, adhesives, fasteners, and other accessories.
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1. Refer to Sheet R2.0 and R2.1 for locations of work. Refer to Sheets R3.0 through R3.7 for installation details. Refer to specification section “Modified Bituminous Membrane Roofing” for work requirements, materials, and procedures.
7.5 FLASHING AND SHEET METAL TRIM
A. Scope of Work
1. Work consists of providing new sheet metal flashings, counterflashings, copings, trim, and other sheet metal roofing accessories as required.
2. Install new edge metal and flashing. See drawings for flashing details at roof parapet.
3. Install new counter-flashings.
4. Install new metal pitch pans, filler and collars. Bonnets shall be installed on all pitch pans.
5. Install new continuous sheet metal caps for all new curbs. Provide a minimum vertical lip of 4” on the cap.
6. Install new formed metal flashings at flue, pipes, etc.
7. Install new drain lead flashings.
8. Install new soil pipe lead flashings.
9. Provide gooseneck hoods at all HVAC line penetrations to eliminate gang pitch pans. All shall extend above the finished roof system a minimum of 18”.
10. Provide all necessary sealants, sealant tapes, and fasteners to ensure a watertight installation,
11. Flashing attachment to substrate shall be designed to resist the wind uplift pressures specified in the General Notes.
B. Materials
1. Sheet metal flashing fabrications, fasteners, and other accessories.
C. Drawings and Specifications
1. Refer to Sheets Sheets R2.0 and R2.1 for location of work. Refer to Sheets R3.0, R3.1, R3.2 and R3.3 for details. Refer to specification section “SBS Modified Bitumen Membrane Roofing” and “Sheet Metal Flashing and Trim” for work requirements, materials, and procedures.
7.6 ROOFING SYSTEM WARRANTY
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1. Work consists of providing a material and labor warranty for the new roofing system.
2. Provide a 20 year material and labor warranty for the new roofing systems. Warranty shall be the shared responsibility of the Roofing Contractor and the Roofing Membrane Manufacturer.
3. The Contractor shall make all necessary notices for warranty purposes to the primary roofing manufacturer, to secure timely inspections and issuance of the warranty.
B. Materials
1. Not applicable.
C. Drawings and Specifications
1. Refer to Sheet R2.0 and R2.1 for locations of work. Refer to Sheets R3.0 through R3.7 for installation details. Refer to specification section “Modified Bituminous Membrane Roofing” for work requirements, materials, and procedures.
22.1 PLUMBING WORK
A. Scope of Work
1. Work consists of restoring existing roof drains to an operable condition.
2. Clean and rod out all drains. Check drain bowl to deck connection to ensure watertight connection prior to roofing tear-off. Check drain bowl to interior downspout connection to ensure watertight connection prior to roofing tear-off. Contact Engineer if existing interior drain connections may lead to interior water leakage.
3. Reuse existing drain bowls and deck plates. Reuse existing clamping rings, fasteners, and strainers unless damaged. Clean and coat steel all required.
4. Install piping extensions as required to raise curbs, vents, stacks, and soil pipes to a minimum of 8” above the finished roof surface.
5. Install new pipe supports on top of new roofing membrane with sacrificial pad or sacrificial layer of cap sheet.
B. Materials
1. Not applicable.
C. Drawings and Specifications
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