waterproof before tile

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Old 01-12-10, 10:20 PM
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waterproof before tile

I am redoing my front porch.
It is approx. 8ft by 3ft.
I have put down 3/4in ply. with joists spaced at 14in, the short way.
I want to put down tile, what is my best way to waterproof the ply. before I lay the tile?
I have thought of using a membrane type of product.
Does what you lay have to have some roughness for the mortar to take.
 
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Old 01-13-10, 04:20 AM
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You won't lay your tile on plywood. You will lay down another 3/4" layer of plywood and 1/4" or 1/2" concrete backer underlayment wherever your tile will be, properly screwing to the plywood per manufacturer's instructions. It comes in 3x5 sheets, so you will only have one seam, unless you plan on wrapping the edges. Some would probably recommend the use of Redguard painted on the cbu to enhance the waterproofness of the cbu, since it will be hit with water with every shower or storm.
 
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