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 MIL-HDBK-1001/5A
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.
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