When installing sub-flooring, you’ll want the rough side facing up as well for traction when working. This is especially true when you have OSB that has been treated with a sealant or moisture barrier. Moisture resistant resins can create even more slippery surfaces.

Which side of OSB floor goes up?

When installing sub-flooring, you’ll want the rough side facing up as well for traction when working. This is especially true when you have OSB that has been treated with a sealant or moisture barrier. Moisture resistant resins can create even more slippery surfaces.

Which direction is OSB stronger?

OSB panels are stronger in one direction than another. In the outer face layers the fibres run in the long direction of the panel. In the core the fibres run in the short direction of the panel.