MIL-HDBK-1001-5 Roofing And Waterproofing S/S By Mil-Std-3007This handbook sets forth guidelines for design of roofing, LAYOUT 1 and waterproofing systems for building construction. It covers design of new low-slope and steep roof systems, reroofing of existing buildings, and waterproofing, and dampproofing systems.

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MIL-HDBK-1001/5A

system.  Voids around tees should be grouted with material recommended by the deck manufacturer.

b)  Because of the vulnerability to moisture, insects, and in some cases fire, these panels may be prohibited by some Military Construction Offices.  Request specific permission to use before specifying.

c)  Approved mechanical fasteners should be used for anchorage of the roof membrane to the deck.  The anchorage recommendations of the manufacturer and insurance rating agencies should be followed.  Above-deck insulation board should be solid- mopped to a mechanically anchored coated base sheet. Insulation may also be mechanically anchored if provided in two layers

(e.g., bottom anchored, top set in hot bitumen).

2.3.5     Poured Gypsum Concrete Roof Decks

a)  When insulation requirements and thicknesses permit, insulation is generally incorporated in the formboards. Because of the difficulties in applying a vapor retarder to this material, poured gypsum should be avoided where upward vapor flow is predominant.  However, a vapor retarder should be considered when specifications require the installation of additional insulation on the top side of the deck.

b)  The ceiling plenum should be adequately ventilated to the exterior or supplied with dehumidified air to prevent moisture buildup.

2.3.6     Lightweight Insulating Concrete Fills

a)  To promote drying of the wet mix, lightweight insulating concrete should be limited to decks with underside venting:  slotted, galvanized steel decks (minimum 1.5 percent open area) or permeable formboards (e.g., fiberglass).

b)  Where high thermal resistance is required, additional, specially designed, closed cell insulation should be incorporated into the concrete. The practice of installing additional preformed insulation boards directly upon the deck is not recommended because it inhibits the drying of the concrete fill by solar radiation.

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