Roof Osb Sheathing 24 Truss Spacing

These little changes can effect the maximum spans allowed by code and you can find the label stamped on the sheathing.

Roof osb sheathing 24 truss spacing.

Boards require a minimum of two nails per truss while sheathing requires six nails due to face width and nail spacing. Lay sheets in rows with the long edge horizontal to the roof bottom. It will support roof. Spacer type panel edge clips are available from some manufacturers.

The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. With edge support and the same snow load 3 8 inch osb can be used. Provide a 1 8 inch gap. I would first verify what you actually have by looking for a stamp on the roof sheathing.

Apa e30 01 american plywood association engineered wood construction guide e 30 indicates that 7 16 osb for roof sheathing with supports 24 o c. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. If the roof live load exceeds 40 psf alternate roof sheathing must be utilized. If the wood structural panels are tightly butted there is no room for expansion and buckling can occur.

Apa recommends a 1 8 inch space between panel edge and end joints. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. The minimum osb panel size is 24 inches in any direction and each sheet end must rest on a rafter. May only be used where the roof live load design snow load is 40 psf or less.

Each of these factors plays a role in determining how many nails you ll need to use per board during roof sheathing application. Roof sheathing panel spacing hints. A structure s roof truss spacing can vary from every 12 to 24 inches. That can mean costly time consuming callbacks.

Plywood and oriented strand board osb like all wood products will expand or shrink slightly with changes in moisture content.