Kerdi board

[DougKearney]

I am considering using Kerdi board instead of Durock or Hardi backer (which I’m more familiar with) for a tub surround. I’m looking for ways to mitigate the expense. Do I have to use the “Fix” caulk, which is way high, or can I use another silicone or preferably, acrylic, caulk where the “Fix” is called for?

[Steve White]

Hey Doug,

Unfortunately, to be insured by schluters warranty you would have to use their caulk.

if your not worried about that, then yes you can definitely use another polyurethane sealant and be fine.

Sika flex is fairly reasonable at the big box stores

https://www.homedepot.com/p/Sikaflex-10-1-fl-oz-White-Construction-Sealant-90618/202529347

Silicon would be probably be fine if its not exposed to where the tile will be installed. Thinset will not bond to silicon, but will to most polyurethane sealant

[Author]

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