Osb Thickness For Roof Uk

Thicknesses range from 5 16 to 3 4 inch and the proper one to use depends on the spacing of the rafters.

Osb thickness for roof uk.

They can range from the standard 4 x 8 piece to a 4 x 9 or even a 4 x 10. For shed construction there are two commonly used grades of osb. However you might find that osb can better suit your needs than plywood for the roof. Half inch osb is suitable for rafter spacings up to 24 inches whether or not the edges are.

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. We have the right sized osb3 board for almost every job. Sterling board is resistant to water with the osb3 option being particularly suitable for humid conditions. 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.

18mm was initially chosen for its strength. The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24. 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. It is a long document with many parts and subsections.