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Hi pauleckler,

I would not use spackling compound under tile. It is not solid enough.

The adhesive would not stick well to it.

Spackling compound is more susceptable to moisture damage, losing all strength and breaking down when it dries.


I would look at the use of a bonding agent prior to putting down the leveling concrete. Also, see if it is available with strengthening fiber or if it can be added.

If you are going to have ceramic tile, using the leveling concrete may be unnecessary since the tile can be adjusted for level even if you have KERDI, DITRA or other underlayment.


Gene
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