SECTION 07510 Mod2.doc

SOLICITATION AG-91T5-S-09-0014

VALYERMO STATION ROOFING

15 JUNE 2009

SECTION 07510

MODIFIED BITUMEN ROOFING

PART 1 - GENERAL

1.01 SCOPE: This work consists of re-roofing the designated building with a modified bitumen roof. The work includes removing the existing built-up roofing down to the wood deck, disposal of old roofing material and seal all pipes, vents and protrusions with an approved sealing compound.

1.02 SUBMITTALS: Catalog data on materials specified in this section shall be submitted to the Contracting Officer for approval. Contractor shall also submit complete installation instructions for review by the Contracting Officer.

1.03 MEASUREMENT AND PAYMENT: The work will be measured as one job, as shown in the SCHEDULE OF ITEMS, complete and accepted in accordance with this specification.

Payment for work performed under this section will be made on a LUMP SUM BASIS at the CONTRACT UNIT PRICE designated in the SCHEDULE OF ITEMS.

Payment will constitute full compensation for furnishing all labor, materials, and equipment necessary to complete the work in accordance with the drawings and specifications.

PART 2 - PRODUCTS

2.01 GENERAL

A. Products indicated herein are the brand names and designations of the Johns Manville. Commercial products of other manufacturer’s certified equivalent in writing may be substituted upon approval of the Contracting Officer.

B. All products shall be new and shall be delivered to the job site in original packages bearing Manufacturer’s labels. All products are subject to inspection prior to use.

2.02 ROOFING MATERIALS

A. Base sheet shall be DeckPro Nailable Base Sheet, nailable felt base sheet with a non-woven polyester mat and an aluminum foil facer that allows for superior adhesion to self-adhering bitumen sheets.

B. Intermediate Ply shall be JMCleanBond SBS Base which is a self-adhering, fire-resistant modified bitumen sheet incorporating the features of a fiberglass mat. The Sheet shall be a blend of SBS (Styrene-Butadiene-Styrene) rubber, fire-retardant additives and asphalt.

C. The cap sheet shall be JMCleanBond SBS Cap Sheet. Which is a fire-resistant, modified bitumen sheet incorporating the features of a strong fiberglass mat with a blend of SBS (Styrene-Butadiene-Styrene) rubber, asphalt and fire-retardant additives.

D. Mechanical fasteners, sealing compounds and other materials shall be compatible products of the roofing manufacturer.

PART 3 - EXECUTION

3.01 PREPARATION

A. Remove existing built-up roofing down to the wood deck. The wood deck shall be securely nailed, smooth, dry, clean, free of sharp projections and depressions.

B. Care shall be taken not to further damage the wood deck. Any surface defects shall be repaired in accordance with good roofing practices. Such work shall be inspected and approved by the contracting officer prior to installation of the new roofing material.

3.02 APPLICATION: The modified bitumen roofing shall be installed in accordance with the manufacturer’s specifications No. 3FND-SA1 FR.

A. BASE SHEET: The wood deck shall be covered with one ply of base sheet. The base sheet shall be mechanically fastened in accordance with manufacturer’s fastenings specifications. Lap each base sheet as specified by the manufacture.

B. MEMBRANES: Membranes shall not be applied during adverse weather. Membranes shall be installed strictly in accordance with the manufacture’s instructions. Membrane shall begin at the low point of the roof and be accurately aligned with the roof edge. Membrane shall be installed perpendicular to the slope of the roof. The end and side laps shall be lapped as specified by the manufacture

C. Sealing compounds: All pipes, vents and protrusions shall be sealed with an approved sealing compound.

3.03 CLEAN-UP: The Contractor shall at all times keep the project site free of waste materials, rubbish, unused tools and equipment. Disposal of waste material and rubbish from the contruction operation shall be at the Contractor’s expense.

3.04 Protection of Property and Facilities: When the weather does not permit continuation of work, in order to prevent water damage to the interior, the Contractor shall provide protection on the building where removal operations are in progress. The Contractor shall be held responsible for any interior damage that occurs due to migration of water into the building. Care shall be taken to protect all surrounding surfaces and facilities.

END OF SECTION