Figure 1: Oriented Strand Board

OSB Frequently Asked Questions

Q How does OSB perform as floor sheathing?

A Sheathing grade OSB subfloors are well suited for most floors and are intended to have an additional layer of flooring material such as an OSB underlayment panel, wood strip flooring or concrete topping.

Single Floor grade panels used as combination subfloor/underlayment do not require an additional layer. The edges of Sheathing or Single Floor panels must be supported with approved tongue and groove joints or solid blocking.

Performance of OSB floor systems can be enhanced, if in addition to nailing, sheathing is glued to the joists with elastomeric glue and the tongue and groove edges are glued together.

Use of thicker subfloors or reduced fastener spacing will also enhance the performance of OSB floors.

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