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Per the Armstrong subfloors and underlayment manual, all Armstrong vinyl tile installations require an underlayment. If you don't have an approved underlayment, you may not receive full warranty coverage for the tiles. Further, the underlayment is secured using mechanical fasteners through the old tiles to the subfloor, so you don't have to worry about ...


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Underlayment is not required for Ditra, although you may need it to make sure your tile is at the same level as the flooring outside the bathroom. In either case your need to level and smooth the sub-floor first because Ditra mat will not fix a bad sub-floor. Self leveling gypsum like Encerwal said is a good fix but if the ripples in your decking are ...



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