OSB has a rough, unfinished side and a smooth side with a thin, moisture-resistant finish. When installing on a roof or subfloor , the rough side should be facing up to provide traction for walking.

However, insulated subfloor paneling, consisting of OSB sheathing backed by foam insulation, is available — for a price. Particleboard is not used as frequently as the previous two options.

However, insulated subfloor paneling, consisting of OSB sheathing backed by foam insulation, is available — for a price. Particleboard is not used as frequently as the previous two options.

Oriented strand board (OSB) is another popular subfloor material. Because it's made up of large wood chips adhered with resin, OSB offers a dense, smooth surface compared to plywood.

Oriented strand board (OSB) is another popular subfloor material. Because it's made up of large wood chips adhered with resin, OSB offers a dense, smooth surface compared to plywood.

However, insulated subfloor paneling, consisting of OSB sheathing backed by foam insulation, is available — for a price. Particleboard is not used as frequently as the previous two options.