Osb Thickness For Roof Uk

Bob225 wrote why waste ply on a roof unless its rough shuttering ply 12mm wbp is perfectly fine if your feeling really tight osb 3 aka stirling board will do the trick i figured hardwood plywood would be a better choice since it s more substantial. Osb sold in the uk is made to comply with bs en 300 oriented strand board osb definitions classifications and specifications. Half inch osb is suitable for rafter spacings up to 24 inches whether or not the edges are.

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Because of its construction some manufacturers actually make larger sheets of osb.

Osb thickness for roof uk.

For shed construction there are two commonly used grades of osb. The recommended minimum thickness of osb panels for timber frame walls is 12mm when the cells in the supporting frame measure up to 62 5cm on a side and 15mm for frame members spaced up to 83 3cm apart. They can range from the standard 4 x 8 piece to a 4 x 9 or even a 4 x 10. So i will try and simplify what you need to know.

We have the right sized osb3 board for almost every job. For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load. However you might find that osb can better suit your needs than plywood for the roof. It is a long document with many parts and subsections.

The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24. 18mm was initially chosen for its strength. Sterling board is resistant to water with the osb3 option being particularly suitable for humid conditions. Thicknesses range from 5 16 to 3 4 inch and the proper one to use depends on the spacing of the rafters.

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