- (a) All state facilities of new construction shall be required to have roof surfaces with a minimum slope of one-quarter inch per foot (1/4”/ft.) for positive drainage.
- (b) Where possible, roof slopes shall be accomplished structurally in lieu of large amounts of tapered insulation fill to reduce costs and weight on the structural system.
(c)
- (1) Avoid excessive slopes in excess of one-half inch per foot (1/2”/ft.) in built-up and modified bitumen roof assemblies which cause slippage and bitumen run-offs.
- (2) Use proper fasteners and bitumen for the slope of the roof and the type of roof assembly.
(d)
- (1) On reroofing of existing facilities, the roof slope may be reduced to one-eighth inch per foot (1/8”/ft.).
- (2) The existing roof should be surveyed for areas which pond water.
- (3) These areas should be leveled or filled as required and practical for the type of substrate.
- (4) Verify that equipment curbs, counterflashing heights, and the like are of sufficient height for reflashing after the installation of new tapered insulation and roof membrane.