08:53AM | 08/30/06
Member Since: 08/29/06
1 lifetime posts
I need to know if I should caulk the 1/4" expansion gap at the wall.

I'm re-tiling because all my tiles done last year right over the wood floor are coming up in the kitchen. This time I'm adding a layer of 3/4" plywood with backer board on top.

I've read that I need to leave a 1/8" gap between the boards and 1/4" at the wall. I can caulk (and tape) the area between the boards, but most websites say not to cault the 1/4" at the wall. My contractor says that will allow water in. Also there will be 3/4" plywood and then perhaps 1/2" backer board and then 1/4" tile, leaving a deep gap. We kind of compromised that he would caulk just the part where the tile is.

I'd am wondering whether that's the best approach. Should I put a baseboard around the edge of the tile (the contractor wasn't planning to)? Am I right in insisting the deep gap not be filled? It is OK to just caulk the top 1/4"?


06:17PM | 08/30/06
Member Since: 07/03/05
283 lifetime posts
Fill the gap if it will be visible. If you put a base molding up, no need to fill it. The gap is required to allow movement of the wood in the walls. Caulk is pliable enough to allow that movement.


10:46PM | 08/30/06
Member Since: 10/28/05
312 lifetime posts
make sure not to use acrylic/latex caulks.

Becasue they allow more movement before the bond breaks, I would only use a 100% silicone caulk/sealant such as you might find here:


There are two ways to do any job. The right way and the wrong way. Do it right everytime.


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