Quote:
1000 Lbs of Thinset Mortar for the backerboard
1000 Lbs of Modified Thinset for the tile
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You will use twice as much thinset when setting the slate than setting the backer.
Figure 80-90 square feet with the 1/4x14 trowell for the backer.
45 feet using the 1/2x1/2 trowell when installing the slate.
Use acrylic modified for the whole job, not just the slate.
Are you using a modified thinset with the additive in the powder? The "just add water" kind?
you may have a s much as 400#'s of thinset left over from the backer install.
KT