Required Thickness Cover Board Roof

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.

Required thickness cover board roof.

A cover board is typically a gypsum board that is installed directly under the membrane. 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. Cover boards are strongly recommended on roofs where regular foot traffic or.

Applying a cover board over mechanically attached insulation offers three distinct advantages. 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. For example inch gypsum board weighs around 2 lbs sq ft.

The fastener is only required to penetrate through the bottom layer of the insulation. Compared to inch hd polyiso board at 0 34 lbs sq ft. Superior dimensional stability over competitive gypsum fiber boards is due to their low coefficient of thermal and hygrometric expansion. Without a cover board the roof is missing added durability.

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. Some cover boards are very heavy making them difficult to handle slowing down work and potentially adding labor costs. A cover board is a thin substrate to which a roof membrane is adhered. 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.

An exceptional fire barrier thermal barrier and re cover board used in various commercial roofing systems. First it reduces the shank length of the fastener by as much as one half of the total insulation thickness. The building is more susceptible to hail fi re and wind damage. Meets the requirements of astm c 1325.

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