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Unread 10-23-2020, 07:21 PM   #10
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Join Date: Oct 2020
Location: Queens NY
Posts: 17
underlayment joints?

Ok, one last silly question, the underlayment sheets are supposed to be gapped by around 1/8" according to Stone F250 and this Article , but when you lay down the mortar to hold down the CBU, won't that fill in the gaps when you key it in? Any reason to put some caulk in it to preserve the flexibility of the gap?

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