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It is critical (especially at the lap areas) to apply adequate heat to both the membrane being installed and the area of membrane being overlapped onto. Granuled APP membranes require treatment of the underlying lap granules by heating and removal or heating and pressing to insure a proper end lap weld. A warm trowel should be used to check laps for an adequate seal. Any unbonded areas must be lifted and retorched. Do not attempt to reseal by torching the top surface of the membrane.

Flashing Details: Flintlastic APP Modified Bitumen

Flashing details are accomplished using cut pieces of Flintlastic APP modified bitumen in combination with appropriate prefabricated flashing components. The same sidelap and endlap rules apply to flashing details as to field membrane. Examples of typical flashing details are as follows:

Parapet Wall Noncombustible cant strip must be installed at the base of the parapet wall. Field membrane plies must extend a minimum of 2" beyond the top of the cant strip.

For nailable walls, appropriate base sheet must also cover parapet wall and extend to the top of cant strip. Base sheet extends over the top of parapet and is mechanically fastened.

Parapet wall flashing membrane (Flintlastic APP modified bitumen) not exceeding roll width must extend to the outside edge of the parapet wall if coping is used, or a minimum of 8" above the top of the cant strip if termination bar and counterflashing are installed, and a minimum of 4" onto the completed field membrane.

Concrete wall with metal counterflashing

Wood parapet wall with metal coping


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