How To Determine Osb Sheathing Thickness For Roofs

Roof will be fully vented.

How to determine osb sheathing thickness for roofs. To find the amount of plywood needed to cover a roof start by finding the area of the roof. Is 1 2 osb okay for a standing seam roof and other roofing materials or is 5 8 preferred. I m halfway though sheeting the roof of my shipping container shop and already need to redo some of it. That s considered to be the minimum.

Estimate the number of sheets needed for sheathing a wall or floor with plywood or osb. Standard dimensions are nominal 4 feet by 8 feet. The cabin is just 440 sf and is in zone 6. One sheet 32 ft.

This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load. This basically calculates the number of sheets needed for a gable roof. Can someone direct me to blogs or q a titles that address roof sheathing thickness. Number of sheets needed based on 4 x 8 sheet size.

Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. Find the area of a roof. You need to find a sheathing with a span rating of at least 32 16 which means either 15 32 or 1 2 thick osb. The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size.

Estimate the amount of plywood or osb needed for sheathing a roof. Because osb is made with wood which will expand or contract when subjected to changes in temperature and relative humidity a plus 0 minus 1 8 inch tolerance on width and. The number of sheaths needed is based on square footage of the area and the square footage of one sheath of plywood. Never attach roof sheathing with staples.

Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Not all thickness are readily available. 1 4 inch to 1 1 4 inch. With this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible.

Sheathing should be a minimum of 19 32 inch thick. My cabin trusses will be 24 oc and i will use either 1 2 or 5 8 osb sheathing and a standing seam metal roof. When this is the case experts recommend a 5 8 inch thick sheet. Watch this now to learn how to avoid this same pr.

8d ring shank nails should be used instead. Keep in mind that the load of the roof still plays a role in the plywood thickness. Multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof in square feet. Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. The typical thickness range for sheathing is 3 8 to 3 4 inch.