Osb Roof Sheathing Thickness

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Osb roof sheathing thickness.

Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. Sheets of 7 16 inch thick with no edge support can be used in an area where the snow load is 30 pounds per square foot. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. When this is the case experts recommend a 5 8 inch thick sheet.

Keep in mind that the load of the roof still plays a role in the plywood thickness. What size plywood for the roof. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. 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.

1 inch 25 4 mm. I m halfway though sheeting the roof of my shipping container shop and already need to redo some of it. Loads will vary with the. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.

In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood. A flatter roof with rafters farther apart may need a thickness of up to inch. With edge support and the same snow load 3 8 inch osb can be used. With this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible.

Thicknesses range from 5 16 to 3 4 inch and the proper one to use. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. Allowable spans for lumber floor and roof sheathing a b for si.