The first course of roofing installed. Sometimes trimmed from main roof material.
Modified bitumen based roofing underlayments. Designed to seal to wood decks and waterproof critical leak areas. Also known as ice and water shield.
The internal intersection of two sloping roof planes that runs from the eaves to the ridge. This intersection collects the most water run-off. See Open Valley, Closed-Cut Valley, and Woven Valley.
See Polyvinyl Chloride.
Horizontal secondary structural member used to transfer loads from the primary structural members.
The ability of a material to withstand being pierced by a sharp object.
An instrument that uses the difference in readings between two thermometers, one having a wet bulb and the other having a dry bulb, to measure the moisture content or relative humidity of air.
A roof assembly in which the insulation and ballast are placed on top of the membrane component. Commonly referred to as an “inverted roof assembly.”
A pumping unit comprised of two (2) positive displacement pumps that is designed to dispense two (2) components at a precise ratio. Used in SPF and plural component coating applications.
A material that is applied to a surface in order to increase that surface’s ability to adhere to or work in conjunction with a subsequently applied material.