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All roofs shall have an overflow system adjacent to drains or scuppers to collect and direct water off the roof should one or more water collection device fail. Overflows are required by most local building codes and should be incorporated into any roof design.

Substrate Preparation

All surfaces to which the Flintlastic modified bitumen is to be installed must be smooth, dry, free from dust or debris, free from settling or distortion, and free from cracks, knotholes, or other defects.

Primer Concrete decks must be properly primed with suitable asphalt primer (meeting ASTM D-41) and the primer must be thoroughly dry. FlintPrime SA, water-based primer is recommended when installing self-adhering systems.

Metal flashings must also be primed with a suitable asphalt primer for metal, and primer must be thoroughly dry and any solvents evaporated prior to application of membrane flashing.

Base Sheet Application

In new construction or re-roofing applications, an appropriate CertainTeed base sheet must be installed over the substrate. Unless otherwise specified, base sheet must be overlapped min. 4" at endlaps and 2" at sidelaps. For mechanical attachment of the base ply on insulated steel substrates, the base sheet at a minimum may be fastened with approved fasteners 12" o.c. on 4" side laps and 18" o.c. in two staggered rows in the field of the sheet 12" in from the edge.

For nailable substrates, base sheet must be mechanically fastened in accordance with NRCA standards (fasteners placed every 9" o.c. at sidelaps and every 18" o.c. in two staggered rows in the field of the sheet; the two stag- gered rows are placed 12" from each sidelap).

For non-nailable sur- faces, spot mopping with hot asphalt at the minimum rate of one 12" circle every 24" o.c. in all directions, using appropriate type asphalt at the


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