Quote:
Originally Posted by trekkor
Start with the original subfloor.
Install a long screw next to each nail. ( 2" or longer )
The hardie backer must be embedded in modified thin set with a 1/4x1/4 notched trowel or you will:
1. void the manufacturer's warranty.
2. likely get cracks in the tile
3. may hear pops or creaks in the floor when walked on.
I fasten the backer with 1.25" roofing nails. Tape the joints with fiberglass mesh using high quality thinset.
You may need to use a self leveling material to assure that the floor is very flat, given the type of tile you have selected.
With marble use a 1/2x1/2 or 3/4x3/4 notched trowel with a high quality thinset.
Take you time. Do not let the installation creep out of square.
Any lippage from adjoining tile to tile will look and feel awful ( especially on bare feet )
Pre-seal the marble with 511 Impregnator prior to grouting.
Use a stiff non-sanded grout and do not over wash or use excessive water in your sponges.
Do not attempt to remove all of the grout streaks, rather concentrate on a quality grout joint fullness and finish.
Re-apply a coat of sealer and buff dry.
Have fun~ Don't rush!
Marble or granite tiles are among the most difficult to install properly.
KT
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So I remove the plywood, screw the existing sub-floor to the studs, and put the Hardi board on the subfloor with thin-set?