How to Compare OSB Plywood Sheathing

OSB panels provide structural integrity and protection from the elements.

Oriented strand board (OSB) is a manufactured wood product that takes chips of wood and presses them together mixed with an adhesive and a coating to limit moisture absorption. OSB panels can be manufactured to larger dimensions if needed.

Identification

OSB can be identified by the multiple strands or chips of wood visible on the surface and throughout the board. This is in comparison to plywood which has multiple plys of wood pressed together.

Types

OSB panels come in varied thicknesses. The panels that are available for subflooring have a tongue and groove so the flooring can be locked together.

Uses

OSB is used for exterior walls, roof sheathing and thicker panels are used for flooring. Most flooring panels also have a greater resistance to moisture.

Comparisons

OSB compared to plywood is more economical by several dollars per sheet. OSB has greater strength when compared to plywood shear. The main disadvantage to OSB is the edge expansion experienced when the board's edge is exposed to moisture.

Warning

As with anything, there are inferior and superior products available. Consumers need to look at moisture variances as well as structural integrity of the panels to determine which best suits their needs.

References

• OSB versus Plywood Website
• University of Massachusetts Construction Department