11:50AM | 04/21/07
Member Since: 04/20/07
1 lifetime posts
I have installed hardwood floor in my livingroom. I have a 3/4" plywood subfloor underneath but I realize now I did not install the hardwood perpendicular to my floor joises.

My room is about 22 x 13'.

Is there something I should do? Should I get underneath the floor and reinforce it?


11:04AM | 04/22/07
Member Since: 10/28/05
312 lifetime posts
The Wood Flooring Manufacturers Association (NOFMA) recommends that when 3/4" solid hardwood flooring is installed parallel to the joists, that the joists have blocking installed installed at a maximum spacing of every 24 inches between all joists under the hardwood system IF the subfloor is properly-installed plywood and below a thickness of one and one-eighth inches OR if the subflooring is properly-installed Oriented Strand Board (OSB) and is below a thickness of one and one-quarter inches.

If the properly-installed subfloor panels is at or above the above thickness(es), then no blocking is required).

Particle board is not a suitable subfloor material for nail down hardwood flooring.

More information can be found in: NOFMA Nail-Down hardwood Installation Information Tip-Sheet:


There are two ways to do any job.

The right way and the wrong way.

Do it right everytime.


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