My problem is that one of the joists is about 12" from the wall. I have screwed on a 4x4 to the joist but when I lay the 1/4" plywood and the 1/2" hardybacker is still flexes alot and I'm sure will brake if you bounced on it.
My question is can I used another 4x4 to make up this gap or is there another way to do it? I will be installing 1/4" Pergo on top of all of this.
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