Q A 3 PV.doc

DESIGN-BUILD OF A BUILDING INTEGRATED PHOTOVOLTAIC ROOF AT CLEVELAND FEDERAL BUILDING AND AN EXTENSIVE VEGETATIVE ROOF AT THE RUDMAN FEDERAL COURTHOUSE IN CONCORD NH.

GS-01P-10-BZ-C-0013

Questions & Answers

(Current as of 25 February 2010)

1. Question: Referencing Vol 2/ 6.2.5.8 & 11.6.8-11.6.16 …If mechanical fastening of any roof component is required to meet the criteria of warranties (11.6.8-11.69.16), will this be acceptable and not contradictory of (6.2.5.8)

Answer: Means of mechanical fastening as required to meet warranty requirements is permissible. However, given known substrate and assumed roofing assembly system- new roof system should be able to meet ASCE-7 design requirements without need for mechanical fastening of coverboard or insulation. Offeror shall coordinate and submit letter from proposed manufacture noting system assembly and warranty rating.

2. Question: Referencing Vol 2 11.6.8 through 11.6.16 …please clarify these sections as they seem to contradict…Is a 90 MPH warranty required for Rudman and a 100 mph at Cleveland or is a 100 mph required at both or 90 mph at both?

Answer: A peak gust of 100 MPH is required for Rudman and a 100 mph peak gust warranty is sought at the Cleveland.

3. Question: Referencing Vol 2/6.2.2.0& 6.2.5.0 & 6.7.2 …Guidelines appear to indicate that R=50 is requested and minimum R=31 is required.

a. Please confirm composite R value should not consider the concrete slab and or any other existing building component.

b. At Rudman courthouse please confirm that R=50 includes roof insulation and green roof components only.

c. At Cleveland Penthouse please confirm it is acceptable to raise the perimeter parapet to allow for R=50 of insulation to be installed.

d. At Cleveland main roof, link, and NE low roof; if by using R=50 insulation, the heights of base flashings shall be reduced to less than 8”, will R=31 be acceptable?

Answer: (3a, b) In figuring the composite target insulation value R-50. The total assembly components value shall be considered - (i.e. Inside face, existing slab, vapor barrier, insulation, coverboard, membrane, [green roof components] outside face).

3c- Yes, this is acceptable as noted in Scope of Work Criteria.

3d- Yes, this is acceptable as noted in scope of work criteria. Offerors are to provide increased insulation value to maximum extent practical given limitations of existing throughwall flashings, and other limitations, while still obtaining warranty requirements from proposed manufacture.

Note: Offeror's shall coordinate and submit letter(s) from proposed manufacture noting all proposed roof system assemblies and warranty ratings.