How To Determine Osb Sheathing Thickness For Roofs

Estimate the number of sheets needed for sheathing a wall or floor with plywood or osb.

How to determine osb sheathing thickness for roofs.

Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. This basically calculates the number of sheets needed for a gable roof. Once the area is known divide by the area of a 4 8 sheet to find how much sheathing is needed. 1 4 inch to 1 1 4 inch.

Never attach roof sheathing with staples. Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. The typical thickness range for sheathing is 3 8 to 3 4 inch. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

Number of sheets needed based on 4 x 8 sheet size. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. 8d ring shank nails should be used instead. Roof will be fully vented.

The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size. I m halfway though sheeting the roof of my shipping container shop and already need to redo some of it. The cabin is just 440 sf and is in zone 6. To find the amount of plywood needed to cover a roof start by finding the area of the 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. When this is the case experts recommend a 5 8 inch thick sheet. Find the area of a roof. 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. Check with suppliers to determine availability. 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. 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.

That s considered to be the minimum. Sheathing should be a minimum of 19 32 inch thick. One sheet 32 ft. Is 1 2 osb okay for a standing seam roof and other roofing materials or is 5 8 preferred.

The number of sheaths needed is based on square footage of the area and the square footage of one sheath of plywood. Standard dimensions are nominal 4 feet by 8 feet. 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. Not all thickness are readily available.

Watch this now to learn how to avoid this same pr. Can someone direct me to blogs or q a titles that address roof sheathing thickness.