26 September 2006
Building Code. Published regulations and ordinances established by a recognized
agency describing design loads, procedures, and construction details for structures.
Usually applying to designated political jurisdiction (city, county, state, etc.). Building
codes control design, construction, and quality of materials, use and occupancy,
location and maintenance of buildings and structures within the area for which the code
was adopted (see Model Codes).
Built-Up Roofing (BUR). A continuous, semiflexible membrane consisting of plies of
saturated felts, coated felts, fabrics or mats assembled in place with alternate layers of
bitumen, and surfaced with mineral aggregate, bituminous material, or a granule
surfaced sheet (abbreviation, BUR).
Butyl Rubber. A synthetic rubber based on isobutylene and a minor amount of
isoprene. It is vulcanizable and features low permeability to gases and water vapor and
good resistance to aging, chemicals and weathering.
Capflashing. See Flashing.
Capsheet. A granule-surfaced coated felt used as the top ply of a built-up roofing
Caulk. To seal joints, seams, or voids by filling with a waterproofing compound or
of vehicle and pigment, used
at ambient temperatures for
filling joints, that remains plastic for an extended time after application.
of performance for paint systems; the ability
resist a dusty/chalky appearance over time.
Chalking. A powdery residue on the surface of a material resulting from degradation or
migration of an ingredient, or both.
Chlorinated polyethylene (CPE). Family of polymers produced by chemical reaction
of chlorine on the linear backbone chain of polyethylene. The resultant rubbery
thermoplastic elastomers presently contain 25- 45% chlorine by weight and 0-25%
crystallinity. CPE can be vulcanized but is usually used in a nonvulcanized form.
Chlorosulfonated polyethylene (CSPE). Family of polymers that are produced by
polyethylene reacting with chlorine and sulfur dioxide. Present polymers contain 25-43%
chlorine and 1.0-1.4% sulfur. They are used in both vulcanized and nonvulcanized
forms. Most membranes based on CSPE are nonvulcanized. ASTM designation for this
polymer is CSM. Best known by the DuPont Tradename "Hypalon."
Closure Strip. A resilient strip such as neoprene, flat on one side and formed to the
contour of ribbed sheets on the other, used to close openings created by joining metal
sheets and flashings.