The Use Of Concrete Form Boards For Roof Sheathing

It spans the rafters to support the roofing and in the case of panel sheathing such as plywood or osb it acts as a diaphragm with the walls to resist horizontal loads.

The use of concrete form boards for roof sheathing.

1 by 8 boards commonly used on the eave and rake overhangs when soffits will not be installed rather than as roof sheathing. Plywood particle board or wafer board roof sheathing is most commonly used being low in cost and easy to apply. The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing. Sheathing should be a minimum of 19 32 inch thick.

The most basic function of sheathing in any application is to form a surface onto which other materials can be applied. The boards are more attractive when viewed from underneath than rough plywood. Sheathing is the board or panel material used in floor wall and roof assemblies of both residential and commercial construction. Sheathing sheathing forms the surface of the concrete.

Oriented strand board isn t plywood nor is it a type of particleboard fiberboard or wafer board and although it is a newcomer to a plywood dominated market its use for exterior sheathing is. Tongue and groove lumber or plywood gives a. Never attach roof sheathing with staples. Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof.

It should be smooth especially if the finished surface is to be exposed. There are several types of sheathing each having a specific function based on its application. 8d ring shank nails should be used instead. The typical thickness range for sheathing is 3 8 to 3 4 inch.

With wood roofs slats are a must to avoid rotting the wood shakes. When i built my house years ago i poured my basement walls using my subfloor as forms and hundreds of feet of 2x4 s for the walers it worked real nice any tile was layed over concrete board also i poured my garage foundation using my 5 8 roof sheathing for its forms. Concrete is plastic when placed in the form so sheathing should be watertight. It is normally 1 inch 3 4 inch dressed tongue and groove lumber or 3 4 inch plywood.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.