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Title
High-Density Polyisocyanurate Cover Boards (and How They Compare to Gypsum-Based Cover Boards)
High-Density Polyisocyanurate Cover Boards (and How They Compare to Gypsum-Based Cover Boards)
Date
4/2022
4/2022
Author(s)
Page(s)
1-6
1-6
Keyword(s)
cover; board; assembly; low-rise; foam
cover; board; assembly; low-rise; foam
Abstract
A cover board is an integral product of a roofing assembly. For a typical roofing assembly, a cover board is installed above the thermal insulation and directly under the membrane and provides a suitable, stable, high compressive substrate for placement of the roof membrane. A cover board can be attached with fasteners or adhered with low-rise foam adhesive or hot asphalt. Utilizing a cover board can increase roof longevity and durability by increasing protection from roof loads (e.g. roof-top traffic, service loads, power carts, trade damage) and weather (i.e. wind, hail) as well as increase fire resistance and energy efficiency. Cover boards also protect against the inherent limitations of polyisocyanurate insulation which may have low facer peel strength leading to facer-sheet delamination, edge cavitation, cupping or bowing, shrinkage, and/or crushing or powdering, according to reported problems directed to the National Roofing Contractors Association (NRCA) circa 2000. “…NRCA recommends that designers specify a suitable cover board over polyisocyanurate insulation in all low-slope membrane roof systems. The use of a cover board should help reduce problems whether directly related to the manufacturing process or due to other causes”1 . Depending on the application, the most appropriate type of cover board for the assembly should be considered.
A cover board is an integral product of a roofing assembly. For a typical roofing assembly, a cover board is installed above the thermal insulation and directly under the membrane and provides a suitable, stable, high compressive substrate for placement of the roof membrane. A cover board can be attached with fasteners or adhered with low-rise foam adhesive or hot asphalt. Utilizing a cover board can increase roof longevity and durability by increasing protection from roof loads (e.g. roof-top traffic, service loads, power carts, trade damage) and weather (i.e. wind, hail) as well as increase fire resistance and energy efficiency. Cover boards also protect against the inherent limitations of polyisocyanurate insulation which may have low facer peel strength leading to facer-sheet delamination, edge cavitation, cupping or bowing, shrinkage, and/or crushing or powdering, according to reported problems directed to the National Roofing Contractors Association (NRCA) circa 2000. “…NRCA recommends that designers specify a suitable cover board over polyisocyanurate insulation in all low-slope membrane roof systems. The use of a cover board should help reduce problems whether directly related to the manufacturing process or due to other causes”1 . Depending on the application, the most appropriate type of cover board for the assembly should be considered.