Flex Thermoplastic Mechanically Attached Roof Membrane - Manual (Page 2)

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1.2 Wood Blocking
A.) Install wood blocking as indicated by the project specifications and in accordance with
current Flex Details and Specifications. Blocking is always required at roof edges and roof
penetrations.
B.) The wood blocking is installed so the top of wood is flush with the top surface of the roof
insulation or cover board.
C.) The wood blocking width is to exceed the width of flange to be attached to the blocking.
D.) The securement of the blocking shall be in a manner to meet or exceed the local building
code requirements and the wind uplift pressure resistance required in the project
specifications.
1.3
Insulation/Recover Board
A.) Only install as much insulation or recover board that can be covered with roofing
membrane and be made watertight in the same day.
B.) Insulation/recover boards are to be installed butted together with no gaps larger than ¼” in
the joints acceptable. Gaps in the joints larger than ¼” must be filled.
C.) Top surfaces of the insulation/recover boards are to be aligned and flush with each other.
Differences in the top edge alignment greater than 1/8” are not acceptable.
D.) Insulation/recover board that is to be installed in multiple layers must have the joints
staggered between each layer.
E.) Insulation /recover board is mechanically attached to the roof deck with Flex Fasteners and
Insulation Plates.
F.) Insulation/recover board is adhered to an approved roof deck with Hot Steep Asphalt or
Flex Insulation Board Adhesive.
1.4 Restrictions
A.) Precautions must be taken when installing materials with Hot Steep Asphalt in
temperatures lower than 40°F. The hot asphalt must be delivered to the application point at
the asphalt manufacturer’s recommended EVT.
B.) Adhesives and sealants must be protected when ambient temperatures are lower than 40°F.
Insulated, heated storage boxes must be provided to store the products on the roof for
temporary storage.
C.) Insulation and underlayment must be stored in a manner to keep the products dry and
protected from the elements. The products must be stored off the roof surface on skids and
covered with a breathable watertight cover.
2.0
Mechanically Attached Membrane Placement and Securement
A.) The substrate must be clean and dry prior to installing the Flex Roof Membrane.
B.) The type of Flex fastener is dependent upon the membrane width and the deck type. The
specific type of approved fastener is found in the components section of Flex’s Technical
Manual. If the proper fastener cannot be determined, contact the Flex Technical Service
Department.