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 > Tile Forum/Advice Board


Thread Tools Search this Thread
Old 03-26-2009, 09:05 PM   #1
Registered User
Join Date: Jan 2009
Posts: 23
Level vs Flat

Correct me if I'm wrong but I figure a quality tile job is more about having a flat floor rather than a level one. I'm wondering how flat is flat enough to have a good looking result. I'm guessing that it will depend on the size of the tile, the spacer size and the span of the floor. At some point trying to get the floor any flatter is probably overkill since you can compensate to some degree with the thinset. My question to all the Pros is do you have some rough guideline as to how flat a floor you like to have? (eg if you are laying 18" tile with a 1/16" spacer in a 4x6 bathroom 1/8" variation is too much but if you are laying 12" tile with a 1/4" spacer in a 12'x25' room 1/8" variation is tolerable)

jbs is offline   Reply With Quote
Sponsored Links
Old 03-26-2009, 09:18 PM   #2
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
Tool Guy - Kg's Avatar
Join Date: Feb 2005
Location: Oak Creek, WI
Posts: 20,170

You're right about flat being most important.

The industry standard is to start with a substrate that's within 1/4" of being flat over the course of 10' and no more than 1/16" in 1'. In other words, a 10' straight-edge on the floor checked in any orientation would have no more than 1/4" of space under it anywhere along it's length. And a 1' straight-edge would have no more than 1/16" space under it. Starting out with a floor at least this flat allows you to make up for the slight differences with mortar to keep lippage under control. But the flatter the floor is before you start tiling, the flatter the final product will be.

Realize that the bigger the tile, the flatter the floor has to be to keep lippage under control. With those 18" tiles (if that's what you are using) and tight grout lines, I'd do everything I could to get it well within 1/8" of flat over the course of 10'.
Tonto Goldstein….. but my friends call me Bubba
Tool Guy - Kg is offline   Reply With Quote
Old 03-27-2009, 11:09 AM   #3
Registered User
Join Date: Jun 2008
Location: Lexington Ky
Posts: 778
Agree with Tool Guy, the bigger the tile the flatter you want that subfloor. Most around here will probably agree that theres no such thing as a floor thats too flat.
Ed, Pro-Am with aspirations of Semi-Pro

"If you have time to do it twice, you have time to do it right once."

"Well cover me in Ditra, and call me an orange!"
Shpedly 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
Subfloor Not Level/Flat dsk1000 Tile Forum/Advice Board 2 03-24-2008 04:56 PM
Level or flat John K Professionals' Hangout 1 06-25-2005 11:01 AM
Level or Flat? Splinter Professionals' Hangout 8 06-08-2005 02:45 PM
best way to tell if floor is level/flat-and other flat surface issues!? acid Tile Forum/Advice Board 9 05-12-2005 10:32 PM
Obsessing about flat/level slab! mo1258 Tile Forum/Advice Board 8 03-31-2004 04:06 PM

All times are GMT -6. The time now is 12:34 PM.


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