26 September 2006
DEFINITIONS. See UFC 310-100-10N DESIGN: GENERAL
ARCHITECTURAL AND INTERIOR DESIGN REQUIREMENTS for a more complete list
Aggregate. (1) Crushed stone, crushed slag, or water-worn gravel used for surfacing a
built-up roof; (2) Any granular mineral material.
or more polymers, e.g.,
a rubber and
improve a given property, e.g., impact strength.
Asphalt. A dark brown to black elastomeric cementitious material whose
predominating constituents are bitumen's that occur in nature or are obtained in
Asphalt felt. An asphalt-saturated felt.
Atactic. A chain of molecules in which the position of the side methyl groups is more or
less random. (Amorphic; Low Crystallinity)
Ballast. Loose aggregate, concrete pavers,
or other material designed
to prevent wind
uplift or flotation of a loose-laid roof system.
Base sheet. A saturated or coated felt placed as the first ply in a multi-ply bituminous
Batten. (1) Raised rib, in a metal roof, or a separate part or formed portion in a metal
roofing panel. (2) One of a series of strips laid in a matrix under tile roof applications.
Bitumen. (1) A class of amorphous, black or dark colored, (solid, semisolid, or viscous)
cementitious substances natural or manufactured, composed principally of high
molecular weight hydrocarbons, soluble in carbon disulfide, and found in asphalts, tars,
pitches, and asphaltites; (2) A generic term used to denote any material composed
principally of bitumen; (3) In the roofing industry there are two basic bitumens: asphalt
and coal-tar pitch. Before application they are either (a) heated to a liquid state, (b)
dissolved in a solvent, or (c) emulsified.
Bituminous (adj.). Containing or treated with bitumen. Examples: bituminous concrete,
bituminous felts and fabrics, bituminous pavement.
Bond. The adhesive and cohesive forces holding two roofing components in intimate
Boot. A bellows type covering to exclude dust, dirt, moisture, etc., forming a flexible
British thermal unit (BTU). Heat energy required to raise the temperature of one
pound of water by 10F (= 1055 joules).