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Unread 03-22-2011, 08:13 PM   #8
Stu27
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Join Date: Aug 2010
Location: Northern Virginia
Posts: 8
Thanks Bob. Decided the extra 1/8 inch in height was more than manageable and went with your recommendation to go with the 1/2 inch underlayment. Picked up half a dozen sheets tonight.

It would be quite an effort for me to sister the joists in order to start with a level and flat foundation, the area to be tiled spans three rooms and has four walls (two corners) over the floor.

The Ardex Feather Finish seems like just what I'm looking for to address the local valleys. Mapei Planipatch looks very similar. Trying to find one or the other (haven't seen them at the big box stores), but will check the local tile supply folks next.

Again, thanks for the guidance.
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