Subfloor waterproofing


Old 07-10-00, 04:00 PM
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I am replacing carpet in an entry way and dining area with slate tile. The subfloor is 3/4" plywood on waferboard I-beams 16" OC. The entry may see occasional water from tracked in rain/snow. Is it necessary to put a waterproofing (resistant) sealer down befor the Wonderboard.
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Old 07-10-00, 08:46 PM
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I see no reason to put down a waterproofing material before the wonderboard. I normally do not. Thinset goes on the subfloor before the cement board and this could interfere with the thinset bonding to the subfloor. Someone else might have other thoughts.
Old 07-10-00, 09:26 PM
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Thank you, I always appreciate your insight.

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