Required Thickness Cover Board Roof

Meets the requirements of astm c 1325.

Required thickness cover board roof. Also some boards notably perlite and fiber boards don t cut cleanly and often create nuisance dust. A cover board is typically a gypsum board that is installed directly under the membrane. 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.

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. Composed of a lightweight cementicious core to provide exceptional impact resistance. 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. Without a cover board the roof is missing added durability.

Some cover boards are very heavy making them difficult to handle slowing down work and potentially adding labor costs. An exceptional fire barrier thermal barrier and re cover board used in various commercial roofing systems. Cover boards are strongly recommended on roofs where regular foot traffic or. 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. For example inch gypsum board weighs around 2 lbs sq ft. First it reduces the shank length of the fastener by as much as one half of the total insulation thickness. 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.

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. Cover boards provide a more solid backing than the insulation boards alone which improves the puncture resistance and long term durability of the roof. A cover board is a thin substrate to which a roof membrane is adhered. 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. Applying a cover board over mechanically attached insulation offers three distinct advantages. The building is more susceptible to hail fi re and wind damage.