I want to install porcelain tile in my glass enclosed porch. Presently there is a 6” x 5/4” pressure treated lumber for the floor. The floor is only 2 years old and in very good condition. Can I use 1/4” cement board as underlayment?
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What is the span of the 6” x 5/4” pt lumber? – Lee Sam Jul 29 '18 at 4:23
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