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Need Help with Self-Leveling, Backer Board & Engineered Bamboo Floor

6 years ago
last modified: 6 years ago

How can I best secure cement backer board to self-leveling compound that is showing signs of stress? I am installing 3/8" Engineered Stranded Bamboo (click &I lock flooring. This is in guest bathroom. I don't want to install fooling, cushion pad and vapor barrier sheet directly over the self leveling compound. Ideally, I don't want to redo for the 2nd time and since I'm not putting in tile, the fractures don't bother me as much. I just want a solid material (we leveled up 3/4" over 21 s.f. ) that will distribute weight when walked on.

1) I've used a roll self adherence product on concrete foundation and no transfer of cracks to the porcelain tile in 8 years. Can I use similar here?

2) can I used backer board, masonry or concrete screws to secures backer board? 3) should I pre drill to prevent cracking?

4) would it be better practice to use modified or unmodified thin set between SLC & backer board?

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