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unlevel garage floor

My garage floor is made up of 2"x12" planks that vary in thickness by 1/2". There are also gaps between the planks of up to 1/2". What can I do to level this floor and eliminate the gaps so I can lay down plywood as a sub floor. The garage is
20'x20' and is elevated by 2' on cement blocks,posts and beams.

A. Spruce
Re: unlevel garage floor

Just overlay the existing floor with plywood. I would recommend at least 5/8 - 5 ply (Home Depot 5/8 is a 4 ply and not as rigid ). If you're going to be driving on it you may want to go with 3/4" plywood.

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