SPF that has excess isocyanate or resin. Off-ratio will not exhibit the full physical properties of normal SPF.
The period of time after an adhesive has been applied and allowed to dry, during which an effective bond can be achieved by joining the two surfaces.
A method of valley construction in which the steep-slope roofing on both sides are trimmed along each side of the valley, exposing the metal valley flashing.
In SPF roofing, a condition of the foam in which the surface shows a fine texture and is compared to the exterior skin of an orange. This surface is considered acceptable for receiving a protective coating.
Being or composed of hydrocarbons or their derivatives, or matter of plant or animal origin.
An asphalt roofing base material manufactured from cellulose fibers.
An asphalt shingle reinforced with material manufactured from cellulose fibers.
Oak Ridge National Laboratory
Component in a roof drainage system used to protect the roof against damage from a water load imposed by blocked or partially blocked primary drainage system; e.g., overflow scupper, overflow interior drain.
Undesirable depositions of airborne spray.
In SPF roofing, a condition of the foam in which the surface shows a linear coarse textured pattern and/or a pebbled surface. This surface is generally downwind of the sprayed polyurethane path and, if severe, unacceptable for proper coating coverage and protection.
A triatomic form of oxygen that is a bluish gas of pungent odor; is formed naturally in the upper atmosphere by a photochemical reaction with solar ultraviolet radiation.
The ability of a material to resist the deteriorating effects of ozone exposure.