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Unread 01-31-2019, 01:15 PM   #76
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,057
Ardex Liquid Backerboard is probably your best bet for filling and flattening. It doesn't require a primer and can go to a feather edge. Plus, it's designed to be tiled over.

Don't remember what you'd planned for your tile backer. If you're using cbu...install that first, then deal with flattening afterwards otherwise, screwing into the stuff you'd use for flattening may crack and create problems. The thinset and cbu may flatten things a little bit, lessening the need for the more expensive filler to complete the job.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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