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/SA

factor, overall thermal transmittance, the R-value for either materials or constructions must first be evaluated because, by definition, the evaluated because, by definition, the U-factor is the reciprocal of the R-value.

Thermal shock.  Stress-producing phenomenon resulting from sudden temperature  drop in a roof membrane when, for example, a rain shower follows brilliant sunshine.

Thermal shock factor (TSF).  Mathematical expression for calculating the theoretical temperature drop required to split a rigidly held membrane sample under tensile constructive stress. (TSF = tensile strength at 0 divided by load strain modules at 0F times coefficient of expansion in temperature range of 0 to 30 degrees F.)

Thermal transmittance (U-factor). The time rate of heat flow per unit area under steady conditions from the fluid on the warm side of a barrier to the fluid on the cold side, per unit temperature difference between the two fluids.  It is evaluated by first evaluating the R-value and then computing its reciprocal.

Thermoplastic. Changing viscosity under thermal cycling (fluid when heated, solid when cooled).

Thermosetting.  Hardening permanently when heated, owing to cross-linking of polymeric resins into a rigid matrix.

Through-wall flashing.  Water-resistant membrane or material assembly extending through a wall's horizontal cross section, and designed to direct flow through the wall toward the exterior.

Tiles.  Roofing tiles are produced by baking plates of molded clay into tile, with density determined by the length of time heated and by heating temperatures.  Clay tile offers a wide range of design possibilities for residential roofs due to the variety of tiles available, i.e. roll tile and flat tile.

U-factor.  See Thermal transmittance.

Vapor barrier.  See Vapor Retarder.

Vapor migration.  Flow of water vapor from a region of high vapor pressure to a region of lower vapor pressure.

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