definition
strict definition
polyurethane foam
Insulating foam made from polyurethane and sprayed onto a surface or into a cavity.
Polyurethane foam is an insulating material made from a synthetic polymer with organic units joined by urethane links. It is applied from a gun as an expanding spray, and can be applied to the surface of a wall or panel, or blown into wall or roof cavities. It has a high insulation rating, but gives off toxic fumes when burned.
The material is applied in place as an expanding foam. A prefabricated polyurethane board has a different insulation form.
Wall surfaces and wall or roof cavities are included application locations. The polymer identity distinguishes polyurethane from the other sprayed foams.
Related definitions
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cellulose spray
A mass of fine particulate plant fiber sprayed into wall and roof cavities for thermal insulation. -
cementitious foam
Thermal and acoustic insulation formed from magnesium oxide cement with air pockets introduced during foaming. -
phenolic foam
Phenolic polymer foam applied in place within wall or roof cavities for thermal insulation. -
polyethylene foam
Thermal insulation made from polyethylene plastic foam containing gas-filled cavities. -
polyisocyanurate foam
Insulating foam made from polyisocyanurate, a plastic similar to polyurethane. -
urea-formaldehyde foam
Sprayed insulation consisting of urea-formaldehyde, a yellowish synthetic resin.