Required Thickness Cover Board Roof

It can be used with single ply roof systems as well as bur and mod bit.

Required thickness cover board roof.

A cover board is typically a gypsum board that is installed directly under the membrane. Applying a cover board over mechanically attached insulation offers three distinct advantages. 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. A cover board is a thin substrate to which a roof membrane is adhered.

Meets the requirements of astm c 1325. Composed of a lightweight cementicious core to provide exceptional impact resistance. Superior dimensional stability over competitive gypsum fiber boards is due to their low coefficient of thermal and hygrometric expansion. Some cover boards are very heavy making them difficult to handle slowing down work and potentially adding labor costs.

Cover boards provide a more solid backing than the insulation boards alone which improves the puncture resistance and long term durability of the roof. 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. Without a cover board the roof is missing added durability. 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 fastener is only required to penetrate through the bottom layer of the insulation. Cover boards are strongly recommended on roofs where regular foot traffic or. The 1 architecturally specified fiberglass mat gypsum roof cover board for nearly 30 years 1.

The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. Also some boards notably perlite and fiber boards don t cut cleanly and often create nuisance dust. Densdeck roof board. An exceptional fire barrier thermal barrier and re cover board used in various commercial roofing systems.

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. 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.