Ceramic Tile Advice Forums - John Bridge Ceramic Tile

Welcome to John Bridge / Tile Your World, the friendliest DIY Forum on the Internet

Advertiser Directory
JohnBridge.com Home
Buy John Bridge's Books

Go Back   Ceramic Tile Advice Forums - John Bridge Ceramic Tile > Tile & Stone Forums > Professionals' Hangout


Thread Tools Search this Thread
Unread 01-07-2021, 09:39 AM   #1
Registered User
Join Date: Jan 2007
Location: Carson Valley, NV
Posts: 167
Gap Size Between Floor Tile and Drywall?

Is there an actual code requirement for the gap size between floor tile and drywall?
Creato is offline   Reply With Quote
Sponsored Links
Unread 01-07-2021, 09:42 AM   #2
Moderator emeritus
cx's Avatar
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 92,261
Not that I'm aware of, Joe. Why do you ask?

cx is online now   Reply With Quote
Unread 01-07-2021, 10:13 AM   #3
Registered User
Join Date: Aug 2020
Posts: 68
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.

Sent from my SM-G950U using Tapatalk
mykcuz is offline   Reply With Quote
Unread 01-07-2021, 10:36 AM   #4
Registered User
Join Date: Jan 2007
Location: Carson Valley, NV
Posts: 167
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.
Creato is offline   Reply With Quote
Unread 01-07-2021, 01:15 PM   #5
John Bridge
Join Date: Mar 2001
Location: Rosanky, Texas
Posts: 68,180
Send a message via AIM to John Bridge
Hi Joe,

I think an eighth is adequate, but a quarter might be better. Base still covers it.
John Bridge is offline   Reply With Quote
Unread 01-10-2021, 10:01 PM   #6
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,225
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.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.

Last edited by jadnashua; 01-10-2021 at 10:33 PM.
jadnashua is offline   Reply With Quote

Stonetooling.com   Tile-Assn.com   National Gypsum Permabase

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
What size trowel for multi size floor pattern? Nanker Tile Forum/Advice Board 12 03-23-2019 06:28 AM
shower floor tile size L. Tile Forum/Advice Board 3 08-17-2009 08:53 AM
Shower Floor Tile Size Johhny Tile Forum/Advice Board 3 12-17-2007 08:09 PM
? about best tile size for shower floor bassthecat Tile Forum/Advice Board 7 09-24-2003 08:20 AM
Tile size for shower floor ChazK Tile Forum/Advice Board 25 05-01-2002 04:54 PM

All times are GMT -6. The time now is 11:36 PM.


Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Copyright 2018 John Bridge & Associates, LLC