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

c)  Service conditions:  Grade 1, standard; Grade 2, heavy-duty.

6.1.2     Liquid-Applied Coatings.  Liquid-applied coatings are a special class of fully adhered membranes.  Chemically, they are synthetic rubbers.

6.1.2.1   Uses.  A major use of liquid-applied coatings is on a substrate of sprayed polyurethane foam (PUF) roofs, which require a waterproof coating.  Liquid-applied coatings for sprayed PUF roofs include polyurethane, neoprene, hypalon, acrylic, and silicone. Other acceptable substrates for these coatings are bare concrete and plywood.

6.1.2.2   Advantages.  Within their narrow range of applicability, fluid-applied membranes have these notable advantages:

a)  conformance to irregular roof surfaces with good adhesion and little waste;

b)  continuous, seamless waterproofing (including base flashing at penetrations and edges for some systems).

6.1.2.3   Disadvantages.  They have:

a)  Overwhelming dependence on high-quality field work. In a concrete deck, cracks must be located, marked, and either sealed or taped.  Cracks and seams greater than 1/64 inch (0.4 millimeters) must be sealed.  A viscous mastic and seams greater than 1/64 inch (0.4 millimeters) must be sealed.  A viscous

mastic material seals cracks between 1/64 and 3/8 inches wide (0.4 and 9.5 millimeters), and because of mastic shrinkage, satisfactory joint filling may require two mastic applications. Cracks or joints over 3/8 inches (9.5 millimeters) require taping.

b)  Cast-in-place concrete decks must be steel-troweled and then cured for at least four weeks to reduce repairs of post- application shrinkage cracks.

c)  To prevent moisture entrapment in the liquid- applied membrane, at least two days must be allowed between the latest rainfall on the substrate and membrane application.

6.2       Perimeter Anchorage.  With the possible exception of liquid-applied systems, single-ply systems are anchored at their

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