MIL-HDBK-1001/SA
Psychrometry. The branch of physics concerned with the measurement or determination of atmospheric conditions, particularly the moisture in air.
R-Value. In thermal insulation, the thermal resistance of insulation materials or constructions. See thermal resistance.
Re-covering. Covering an existing roof assembly with a new membrane instead of removing the existing roof system before installing the new membrane.
Rake. Edge of a roof at a gable.
Reglet. A horizontal groove in a wall or other vertical surface for anchoring flashing.
Relative humidity. Ratio (expressed as percentage) of the mass per unit volume (or partial pressure) or water vapor in an air- vapor mixture to the saturated mass per unit volume (or partial pressure) of the water vapor at the same temperature.
Rep. Unit of vapor-permeance resistance, reciprocal of perm. Replacement. Process of removing and replacing an existing roof
system (as opposed to mere re-covering, see above), also called
tearoff-replacement.
Reroofing. The re-covering or replacement of an existing roof. Resin. Basic raw material for manufacturing polymers, a
synthetic polymer containing no deliberately added ingredients.
Ridging. Membrane defect characterized by upward displacement of the membrane, usually over insulation board joints (see Picture Framing).
Roll roofing. Coated felts, sometimes mineral-surfaced, supplied in rolls and designed for use without field-applied surfacing.
Roofer. Roofing contractor or subcontractor.
Roofing system. An assembly of interacting components designed to weatherproof, and normally to insulate, a building's top surface.
R-Factor. See Thermal Resistance.
77
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business