Required Thickness Cover Board Roof

Applying a cover board over mechanically attached insulation offers three distinct advantages.

Required thickness cover board roof.

For example inch gypsum board weighs around 2 lbs sq ft. Meets the requirements of astm c 1325. The fastener is only required to penetrate through the bottom layer of the insulation. Superior dimensional stability over competitive gypsum fiber boards is due to their low coefficient of thermal and hygrometric expansion.

Densdeck roof board. It can be used with single ply roof systems as well as bur and mod bit. An exceptional fire barrier thermal barrier and re cover board used in various commercial roofing systems. The thickness is often chosen based on the need for the board to provide integrity over the roof deck such as at flute spans on steel roof decks.

Without a cover board the roof is missing added durability. Composed of a lightweight cementicious core to provide exceptional impact resistance. A cover board is typically a gypsum board that is installed directly under the membrane. However the use of a cover board far exceeds that of a substrate it also serves as a critical component that helps to extend the life of a roof.

The building is more susceptible to hail fi re and wind damage. First it reduces the shank length of the fastener by as much as one half of the total insulation thickness. Structodek hd with primed red coating is a high density wood fiber roof cover board with a proprietary red primer on two sides that provides an optimal bonding surface for single ply adhesives hot asphalt and unlike other wood fiber boards firestone mb cold adhesive. Compared to inch hd polyiso board at 0 34 lbs sq ft.

For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. The type of substrate board should be chosen based on the roof deck type interior building use installation time of year and the cover material to be placed upon it. The 1 architecturally specified fiberglass mat gypsum roof cover board for nearly 30 years 1. Also some boards notably perlite and fiber boards don t cut cleanly and often create nuisance dust.

The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. Exceptionally high compressive strength improves overall roof system performance cement board is able to withstand prolonged exposure to moisture and is ideal for systems where wind uplift and puncture resistance are a concern. A cover board is a thin substrate to which a roof membrane is adhered.