The Use Of Concrete Form Boards For Roof Sheathing

There are several types of sheathing each having a specific function based on its application.

The use of concrete form boards for roof sheathing.

Each type of roof board is uniquely designed to help protect your roof when used as a fire barrier thermal barrier coverboard recoverboard or parapet wall. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. Securock roof boards are a portfolio of high performance roof boards to meet the needs of your low slope commercial roofing project.

Tongue and groove lumber or plywood gives a. Concrete is plastic when placed in the form so sheathing should be watertight. 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. It is normally 1 inch 3 4 inch dressed tongue and groove lumber or 3 4 inch plywood.

Never attach roof sheathing with staples. With wood roofs slats are a must to avoid rotting the wood shakes. 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.

Plywood particle board or wafer board roof sheathing is most commonly used being low in cost and easy to apply. Sheathing sheathing forms the surface of the concrete. 8d ring shank nails should be used instead. 1 by 8 boards commonly used on the eave and rake overhangs when soffits will not be installed rather than as roof sheathing.

The typical thickness range for sheathing is 3 8 to 3 4 inch. 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 boards are more attractive when viewed from underneath than rough plywood. If you have chosen to use a rigid roofing metal wood shakes or shingles tile etc you can use 1 x 4 slats instead.

The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing.