What Is Better for Hardwood Floors Plywood or Osb?

Subfloors are one of the most important elements of floor installation.

OSB is Less Expensive than Plywood

OSB is an approved product for sub-flooring by the National Wood Flooring Association.

In most cases OSB, or Oriented Strand Board, is less expensive than traditional plywood sub-flooring. This product grew out of wafer-board, which was commonly used as a building material in the 1970's. OSB is fire resistant, impact resistant, and can help control both noise and temperature. It is approved as an acceptable form of sub-flooring by the National Wood Flooring Association, and others. The only noted problem with OSB is in the area of weatherproofing. While exposure 1 OSB can stand up to the elements, the cut edges are likely to be susceptible to moisture damage and decay.

Plywood is Tried and True

Not all types and grades of plywood are recommended for use in sub-flooring.

Builders and contractors have been relying CDX 3/4 inch plywood for use in sub-flooring for more than 30 years, as of 2010. This product is most recommended by manufacturers of hardwood floors, for use with products. While there are different grades and types of plywood available, not all of which are recommended for use as sub-flooring, sticking with a trusted variety such as luan has worked for many builders throughout the years.

Bottom Line

Both products are accepted by the National Wood Flooring Association.

Both products are considered durable, weather resistant, and both can be considered "green" or eco-friendly. The National Oak Flooring Manufacturer's Association, and the National Wood Flooring Association lists both products among the top four "best to use." When these sources ranked products from best to worst, however, 3/4 inch tongue and groove Sturdi Floor plywood sub-flooring came in above 3/4 inch OSB (Orientated Strand Board) tongue and groove sub-flooring.

References

• Ask the Builder: Plywood and OSB
• WoodInstaller.com: Hardwood Installer: Subfloors