Osb Which Side Up Roofing

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Osb which side up roofing.

I m halfway though sheeting the roof of my shipping container shop and already need to redo some of it. Builders use osb to sheath. Roof trusses must be dry when sheathing a roof with osb to prevent mold growth in the roof and coverage gaps as the trusses dry and shrink. Sheets made from aspen or poplar which are common have more rot susceptibility than those made from rot resistant.

Avoid installing osb with the textured side down. The screened surface also provides a little more traction for construction workers during installation. When the grade stamp is covered by roofing the building inspector will not be able to confirm that the correct osb roofing panel was used. The textured surface helps flashing and waterproof underlay stay in place effectively.

Be particular about your framing you cannot install your osb sheathing directly. Osb sheathing has different textures on both sides as well. Install osb textured side up. Avoid putting osb on wet roof trusses.

One side has a polyurethane coating that shields the object from natural elements such as moisture but the opposite side does not have a finish at all.