Amend001.doc

Solicitation No. AG-95CV-S-09-0020, RECOVERY—Replace or Repair/Resurface Roofs, Main

Amendment 001

Bldg (N.Wing), WAB & Service Bldg, WRRC, Albany, CA

09 September 2009 General

The following revisions shall be made part of this solicitation. All other project requirements remain unchanged.

WAB (Labs) Roof Section 01732, Selective Demolition Paragraph 3.5.A. – Replace sentence, “Remove all existing metal flashings and dispose of properly.”, with, “Snap even/uniform line on existing poured-in-place counterflashing and carefully trim off leaving one (1) inch leg. Existing two-piece counterflashing on stucco walls shall be re-used.”

Paragraph 3.5.B. – Replace sentence, “Remove all existing roofing and base flashings to concrete deck.”, with, “Remove all existing roofing, insulation, and base flashings to substrate.”

Paragraph 3.5.D – Insert this new paragraph, following Paragraph 3.5.C.:

“Remove all ‘dead’/unused sleepers and dispose of properly.”

Section 06105, Miscellaneous Carpentry Paragraph 3.2.A. – Replace sentences, “Provide to replace like kind and where required for attaching other work. Coordinate locations with other work involved.”, with, “Replace all existing ‘in use’ wood sleepers with new.”

Section 07540, TPA Membrane Roofing Paragraph 1.9.A.1. – Replace sentence, “Special warranty includes roofing membrane, base flashings, roof insulation, fasteners, and other components of membrane roofing system.”, with, “Manufacturer’s warranty shall provide coverage for the roofing system, consisting of roof assembly components, including membrane, insulation, flashings, all sheet metal related details and terminations details.”

Paragraph 1.9.A.3. – Insert this new paragraph, following Paragraph 1.9.A.2.:

“Inspections, housekeeping, and preventative maintenance shall be performed in years two (2), five (5), ten (10), fifteen (15), and twenty (20) following Government Final Acceptance:

a. Inspections – Perform inspection of roof assembly, metal edge flashings, base flashings, counterflashings, and terminations.

b. Preventative maintenance – Perform maintenance on metal edge flashings. Repair splits and breaks in membrane. Repair/seal open flashings, exposed fasteners, counterflashings, and terminations.

c. Housekeeping – Perform rooftop housekeeping, to include removal of debris from roof.

All inspection, preventative maintenance, and housekeeping services shall be defined in Manufacturer’s warranty.”

Paragraph 2.4.B. – Replace, “one (1) inch”, with, “two (2) inches.”

Paragraph 2.4.C. – Replace, “Fiberboard:…in thickness.”, with, “Recover Board: ¼-inch Dens

Deck meeting ASTM C1177.”

Paragraph 3.5.H. – Add sentence, “Provide tapered edge on uphill side of curbs/sleepers to provide positive slope to direct water around curbs/sleepers.”, following the sentence, “…walk pads.”

Paragraph 3.5.M. – Insert this new paragraph, following Paragraph 3.5.L.:

“Existing L steel support base: Provide coated metal pitch pan at base of existing L steel support base. Fill pan 75% full with cementitious filler. Top off with minimum 1 inch liquid urethane sealant. Strip in base of pan by heat welding to metal base and filed membrane.”

Main Building (N. Wing), WAB (Directors Wing), and Service Building Roofs Section 01736, Selective Demolition

Paragraph 3.5.A. – Replace sentence, “Existing Caulking: Remove all existing caulking and backer rod from joints.”, with, “Existing Caulking: Remove all existing caulking from areas that have failed.”

Paragraph 3.5.B. – Replace sentence, “Existing Coating: Remove all existing coating to expose a clean, sound substrate.”, with, “Existing Coating: Remove all existing coating that is loose, non-adhered on roof membrane and related flashings, to expose a clean, dry membrane.”

Paragraph 3.5.C. – Replace sentence, “Remove all non-adhered repair materials.”, with, “Repair all non-adhered repair materials.”

Paragraph 3.5.D. – Insert this new paragraph, following Paragraph 3.5.C.:

“Remove all wood blocking and dispose of properly.”

Section 07543, Roof Restoration with Title 24 ‘Energy Star’ Coating System Paragraph 1.2.A.6. – Replace sentences, “Gravelstop Joints – Spud clean to roof membrane. Install six (6) inch wide strip of composite ply set in fibrated mastic over joint.”, with, “Gravelstops – Neatly trim roofing back in a two (2) inch wide strip from gravelstop rise. Set six (6) inch wide band of composite reinforcing ply in a continuous application of fibrated mastic, and roll in for maximum adhesion.”

Paragraph 1.2.A.7. – Replace sentences, “Walkpads – Remove prior to roof work. Set aside for re-use. Re-install to original locations upon completion of roof work.”, with, “Walkpads – Existing walkpads are to remain in place.”

Paragraph 1.2.A.9. – Revise, “…over entire field of roof.”, to read, “…over entire field of roof, to include base flashings.”

Paragraph 1.9.A.1. – Replace sentence, “Special warranty includes roofing membrane, base flashings, roof insulation, fasteners, and other components of roofing system.”, with, “Manufacturer’s warranty shall provide coverage for the roofing system, consisting of roof assembly components, including membrane, insulation, flashings, all sheet metal related details and terminations details.”

Paragraph 1.9.A.3. – Insert this new paragraph, following Paragraph 1.9.A.2.:

“Inspections, housekeeping, and preventative maintenance shall be performed in years two (2), five (5), and ten (10) following Government Final Acceptance:

a. Inspections – Perform inspection of roof assembly, metal edge flashings, base flashings, counterflashings, and terminations.

b. Preventative maintenance – Perform maintenance on metal edge flashings. Repair splits and breaks in membrane. Repair/seal open flashings, exposed fasteners, counterflashings, and terminations.

c. Housekeeping – Perform rooftop housekeeping, to include removal of debris from roof.

All inspection, preventative maintenance, and housekeeping services shall be defined in Manufacturer’s warranty.”

Paragraph 2.2.A. – Replace sentence, “Polyester Ply: ASTM D 3776; High Tensile trilaminate fabric with fiberglass scrim and polyester mats laminated with an acrylic binder.”, with, “Polyester Ply: High Tensile trilaminate fabric with two (2) polyester mats laminated with acrylic and infused with quick break additive meeting ASTM D 3776.”

Paragraph 2.2.B.3.b. – Replace “33 lb.” with “31 lb.”

Paragraph 2.2.B.3.c. – Replace sentence, “Breaking Strength: 90 lbf/in MD. 70 lbf/in XMD”, with, “Breaking Strength: 130 lbf/in MD and XMD.”

Paragraph 2.5.F. – Replace sentence, “’Cool Roof’ Coating: Fire retardant, styrenated acrylic latex roof coating, reflectance 90%.”, with, “’Cool Roof’ Coating: High solids, waterbased, heavy-bodied elastomeric coating with acrylic polymer base utilizing nanotechnology.”

Paragraph 3.2.D. – Following the last sentence, add, “(estimated quantity of roof membrane repair is 300 square feet.)” Paragraph 3.4.A.2. – Delete sentence, “Apply top coat of emulsion at same rate as base, four (4) gallons per 100 square feet.”

Paragraph 3.4.B.2. – Replace sentences, “Over entire roof surface, apply uniform and continuous application of white ‘cool roof’ coating at a rate according to roof system manufacturer’s written instructions. Coating to be applied at rate of one (1) gallon per 100 square feet, two (2) coats required at this rate.”, with, “Over entire roof surface, apply uniform and continuous application of white ‘cool roof’ coating. Coating to be applied per manufacturer’s recommended timeframe after quick break emulsion and reinforcing mat are installed.

Coating to be applied at the rate of two (2) gallons per 100 square feet, two

(2) coats required at this rate.”

Article 3.5 – Replace header, “FLASHING AND STRIPPING INSTALLATION

(installation of new base flashings and repair of existing damaged base flashings)”, with, “FLASHING AND STRIPPING INSTALLATION

(installation of new base flashings and repair of existing damaged base flashings; estimated quantity of base flashing repair/replacement is 300 lineal feet)” Paragraph 3.6.F. – Replace sentences, “Walkpads: Remove and set aside for re-use. Re-install to original locations upon completion of roof work. If unable to remove walkpad, directly abut system to walkpad edge.”, with, “Walkpads: Existing walkpads are to remain in place. Directly abut system to walkpad edge.”

Paragraph 3.6.I. – Insert this new paragraph, following Paragraph 3.6.H.:

“Existing Equipment Isolator Base and Unistrut Pipe/Conduit Supports: At isolator base and unistrut supports, loosen and back out bolts anchoring equipment and pipe/conduit. Provide flexible membrane sheet. Cut sheet to fit, one (1) piece for end to fit directly under base or unistrut where anchored.

Sheet shall extend a minimum of six (6) inches in all directions from that location. Provide minimum 45 mil reinforced flexible membrane by roofing system manufacturer. Set sheet in bonding adhesive. Tie reinforced maintenance system into sheet around perimeter edge of sheet. Set base or unistrut into original position, set new bolt with washers into caulking and secure.”

Paragraph 3.6.J. – Insert this new paragraph, following Paragraph 3.6.I.:

“WAB Directors Wing Roof: Along the entire east and west perimeters of the roof, where roof drains exist, starting from the base of the parapet wall and continuing up the slope of the roof for six (6) feet, apply white adhesive in a uniform manner at the rate of four (4) gallons per 100 square feet, over the reinforced system furnished. Broadcast White Lucas rock at the rate of 250 pounds per 100 square feet, and broom in for maximum adhesion.”

Paragraph 3.6.K. – Insert this new paragraph, following Paragraph 3.6.J.:

“Sleeper Caps: Run new reinforced system to base of existing sleeper caps.

Trim off neatly around base. Provide white elastomeric mastic to form a

45-degree angle cant around perimeter of base.”

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