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Wonderboard or not?

Posted by Larry L. Graham on January 1st, 2000 06:17 PM

A wooden, second story lounge has been built in my concrete floor metal hangar. The wooden structure (twelve inch manufactured floor joists on sixteen inch center with one and one quarter inch tongue and groove plywood sub-floor) supported by eighteen inch glue-lam beam and four by four inch steel verticle columns. Question: will this structure support floor tiles directly or is Wonderboard necessary between floor tiles and plywood?

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