SECTION 07510 - AMENDMENT 1.doc

SOLICITATION AG-91T5-S-09-0014

VALYERMO STATION ROOFING

9 JUNE 2009

AMENDMENT 1

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.

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 U.S. INTEC INC., Roofing and Waterproofing Products. 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 Workhorse Ultra Base Sheet, asphalt saturated or polymer modified fiberglass, 23 pound per square or heavier fiberglass base.

B. Roof membrane shall be BRAI Supreme APP Modified Bitumen Roofing Membranes torch-applied with a mineral surface. Color shall be tan.

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

D. Summary of Materials per 100 square feet:

Intec Base or Intec Modified Base, Base Sheet (1 ply) Pounds BRAI Supreme App Smooth (Block House Only) Pounds

BRAI Supreme App Granule Pounds Approximate Total Finished Weight Pounds

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 accoreance with the manufacturer’s specifications No. B-SP-4000-N.

A. BASE SHEET: The wood deck shall be covered with on ply of base sheet. The base sheet shall be mechanically fastened in accordance with manufacturer’s fastenings specifications. Lap each base sheet three inches.

B. MEMBRANE: Membrane shall be heat welded with a propane torch or electric healt welded over entire surface of base sheet. Membrane shall not be applied during adverse weather or without precautionary measures in temperatures below 30º F. 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 laps shall be lapped s inches, and the side laps shall be lapped three inches. A compound flowout approximately 3/8” to 5/8” must be obtained at all seam areas. All seams shall receive a finished trowel sealing.

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