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Unread 01-07-2021, 09:39 AM   #1
Creato
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Gap Size Between Floor Tile and Drywall?

Is there an actual code requirement for the gap size between floor tile and drywall?
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Unread 01-07-2021, 09:42 AM   #2
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Not that I'm aware of, Joe. Why do you ask?
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Unread 01-07-2021, 10:13 AM   #3
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No, there is no sheetrock inspection that I've ever heard of. By the time the inspector sees it, base trim is installed.

That said, 1/4-1/2" is good to avoid absorbing moisture into the wallboard, but you don't want an open hole for fire reasons. In case of a fire in wall, it would provide oxygen. Around me, inspectors will fail you for not sealing plumbing pipes under the sink for fire reasons.

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Unread 01-07-2021, 10:36 AM   #4
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CX- I ask because an employee of mine says there is and I've never heard of it. I typically leave 1/8" gap and never had an issue.
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Unread 01-07-2021, 01:15 PM   #5
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Hi Joe,

I think an eighth is adequate, but a quarter might be better. Base still covers it.
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Unread 01-10-2021, 10:01 PM   #6
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It depends somewhat on how big the tiled surface is and what the temperature variations are. The thermal expansion rates are a relative known, but the bigger the temperature variation is, the bigger the assembly will be and the gap requirement would grow. IOW, a smaller room can get by with a smaller gap than a huge one that might have a lot of direct sunlight or radiant heating, whether electric or hydronic. While ceramics are pretty stable, the coefficient of expansion is around 4.6x10 to the -6 per degree C. Say it's on a concrete slab, and the slab is cool at maybe 15C, and the sun is hitting the tile heating the surface to 35C, that's a 20-degree increase. If the room was 20' wide, 20'*20C-degrees*12"*4.6x10exp-6=.022" or a little more than 1/48" if I did the math right.

A plain ceramic tile will expand at a higher rate than a good porcelain.
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