07-03-2008, 08:16 PM
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Handy, Man
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Join Date: Mar 2006
Location: North Carolina
Posts: 492
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What "cross member" under the toilet are you referring to ? there should be the floor joists and thats about it.
Your plan is good except if it were me I'd be bolting the sistered joists, tat is a much stronger way.
Don't be cutting the CCA or CCQ or any treated lumber around your little fella, but once it is covered there should be no problems.
The best way I'd see would be to use the 3/4" CCA/CCQ as the sub floor covering then use a standard grade floor covering of ply, this would be a much better base for stick on tiles.
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