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

GLOSSARY

Aggregate.  Gravel, crushed stone, washed round river gravel slag or mineral granules either (a) embedded in a conventional built- up membrane's bituminous flood coat, or (b) laid on a membrane as a protective ballast.  Crushed stone should be avoided if possible.

Alligatoring.  Deep shrinkage cracks, progressing down from the surface, in smooth-surfaced membrane coatings and sometimes in bare spots of aggregate-surfaced membranes, a consequence of photo-oxidative hardening, shrinkage due to loss of aromatics.

Asphalt.  A dark brown to black, highly viscous, hydrocarbon produced from the residuum left after the distillation of petroleum, used as the waterproofing agent of built-up roofs and other building components.

Atactic polypropylene.  High molecular-weight, thermoplastic, amorphous polymers used as a chemical ingredient to improve flexibility, elasticity, and ductility of bitumen, used in some single-ply modified bitumen membranes for torching applications.

Backnailing.  Slippage-preventing technique of "blind" (i.e., concealed) nailing in addition to hot-mopping.

Ballast.  Aggregate, concrete pavers, or other material designed to prevent wind uplift or flotation of a loose-laid roof or insulation system.  Aggregate should be smooth, round, without flat faces and sharp edges.

Base Flashing.  See Flashing.

Base ply.  A felt or mat, usually coated, placed as the first non-shingled ply in a multi-ply built-up roof membrane.

Batten.  Narrow metal or wood band used to anchor a membrane against wind uplift.

Bitumen.  Generic term for an amorphous, semisolid mixture of complex hydrocarbons derived from petroleum or coal.  In the roofing industry there are two basic bitumens: asphalt and coal- tar pitch.  Before application, they are either (l) heated to a liquid state, (2) dissolved in a solvent, or (3) emulsified.

Blindnailing.  Nailing of felts with nail heads covered by overlapping top felts.

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