MIL-HDBK-1001/5A
maximum 12-inch (305-millimeter) curb height, with base and counterflashing.
2.2.4 Roof Assemblies. Design roof assemblies to satisfy established fire ratings, and Factory Mutual (FM) or Underwriters Laboratories, Inc., (UL) requirements. (Refer to Section 11.)
2.2.5 General Precautions
a) If the building is expected to have high interior moisture, refer to Section 4 and consult deck material manufacturer for information and recommendations;
b) Wood blocking around openings and drains must be installed before insulation and roofing is installed.
2.3 Precautions for Specific Roof Decks
2.3.1 Precast Concrete Panel Roof Decks
a) Camber differentials that exceed 1/8 inch (3 millimeters) must be corrected by using a Portland cement fill or grout, feathered to a maximum slope of 1/8 inch per foot (one percent);
b) To prevent bitumen drippage, joints should either be stripped in with felt or tape material recommended by roofing system manufacturer or grouted with cement fillings where openings occur.
2.3.2 Prestressed Precast Concrete Roof Decks. If rigid insulation is used, differentials in adjacent prestressed
concrete units must be corrected by fill or grout, feathered to a maximum slope of 1/8 inch per foot (one percent).
2.3.3 Wood Board or Plywood Roof Decks. For all wood decks, a barrier of rosin sized sheathing paper or similar material should be placed between the roof membrane and the deck to allow relative movement.
2.3.4 Cement-Wood Fiber Panel Roof Decks
a) Resistance to wind uplift and lateral movement should be provided by one of the following anchorage techniques: (1) Clips, nails, or other devices anchoring the deck directly to the roof framing; or (2) Sub-purlins anchored to the roof framing
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