Raising Floor 1/8 Inch - Flooring - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Flooring

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Like Tree5Likes
Reply
 
Thread Tools
Display Modes
Old 08-26-2017, 02:16 PM   #1
Newbie
 
Join Date: Aug 2017
Posts: 6
Rewards Points: 12
Default

Raising floor 1/8 inch


First time posting, so thank you in advance for the help!

I am getting ready to tile two small connected rooms with 12x24 gauged slate tiles. Both rooms have solid sub-floors (3/4 ply), but the sub-floor is 1/8" higher in one room (one room was an addition and had different flooring which hid the difference before). What is the best way to bring the lower floor up 1/8" before I install the cement board?

I have looked at using Ditra (or a similar membrane), 1/8 plywood sheets and 1/8 cork roll, but I wasn't sure which was the best and most cost efficient. The space I need to raise is only only 10.5'x4.5' so I'd prefer not to have to buy a big expensive roll of something that I probably won't ever need to use the rest of.
Birch McMullin is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-26-2017, 05:37 PM   #2
Member
 
47_47's Avatar
 
Join Date: Sep 2007
Location: Springville, NY
Posts: 2,585
Rewards Points: 320
Default

Re: Raising floor 1/8 inch


The tile store I deal with carries backer board in 1/8" increments.
47_47 is offline   Reply With Quote
The Following User Says Thank You to 47_47 For This Useful Post:
Birch McMullin (08-30-2017)
Sponsored Links
Advertisement
 
Old 08-27-2017, 09:38 AM   #3
Newbie
 
Join Date: Aug 2017
Posts: 6
Rewards Points: 12
Default

Re: Raising floor 1/8 inch


Thanks! I'll see if I can find a store that sells 3/8" backer (I'm using 1/4" in the other room).
Birch McMullin is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-27-2017, 11:03 AM   #4
Pro Flooring Installer
 
rusty baker's Avatar
 
Join Date: Feb 2009
Location: SW Missouri
Posts: 6,407
Rewards Points: 1,970
Default

Re: Raising floor 1/8 inch


Quote:
Originally Posted by Birch McMullin View Post
First time posting, so thank you in advance for the help!

I am getting ready to tile two small connected rooms with 12x24 gauged slate tiles. Both rooms have solid sub-floors (3/4 ply), but the sub-floor is 1/8" higher in one room (one room was an addition and had different flooring which hid the difference before). What is the best way to bring the lower floor up 1/8" before I install the cement board?

I have looked at using Ditra (or a similar membrane), 1/8 plywood sheets and 1/8 cork roll, but I wasn't sure which was the best and most cost efficient. The space I need to raise is only only 10.5'x4.5' so I'd prefer not to have to buy a big expensive roll of something that I probably won't ever need to use the rest of.
3/4 ply is not really considered strong enough for slate tiles.
jlhaslip and Nealtw like this.
__________________
The ads in my post are there without my permission. I do not endorse any of the products.
Semi-Retired Installer
Installing since 1973
rusty baker is offline   Reply With Quote
Old 08-27-2017, 02:05 PM   #5
Member
 
47_47's Avatar
 
Join Date: Sep 2007
Location: Springville, NY
Posts: 2,585
Rewards Points: 320
Default

Re: Raising floor 1/8 inch


Good catch by Rusty. Sorry op, missed the fact you are going with slate on 3/4" subfloor. You should add plywood to stiffen the floor. You could make up your 1/8" with the ply.

Listen to pros like Rusty for proper methods.
MTN REMODEL LLC likes this.
47_47 is offline   Reply With Quote
The Following User Says Thank You to 47_47 For This Useful Post:
Birch McMullin (08-30-2017)
Old 08-27-2017, 10:18 PM   #6
Newbie
 
Join Date: Aug 2017
Posts: 6
Rewards Points: 12
Default

Re: Raising floor 1/8 inch


Thanks. How much additional plywood should I add? Would using 1/2" backer (instead of 1/4") help? I'm trying to avoid adding too much thickness, since that floor is already going to be a little higher than the flooring in the rest of the house.
Birch McMullin is offline   Reply With Quote
Old 08-28-2017, 01:30 AM   #7
Member
 
jlhaslip's Avatar
 
Join Date: Dec 2009
Location: Edmonton, Alberta
Posts: 5,975
Rewards Points: 708
Default

Re: Raising floor 1/8 inch


What is your joist spacing? That affects the floor and subfloor stiffness.
I rarely see tile on anything less than 1 1/4 inch subfloor thickness.
Nealtw likes this.
__________________
Quote:
Short of cutting off a body part, the worst that can happen in woodworking is manufacturing really nice looking kindling. --- Quoted from lenaitch
jlhaslip is offline   Reply With Quote
The Following User Says Thank You to jlhaslip For This Useful Post:
Birch McMullin (08-30-2017)
Old 08-28-2017, 07:14 AM   #8
Pro Flooring Installer
 
rusty baker's Avatar
 
Join Date: Feb 2009
Location: SW Missouri
Posts: 6,407
Rewards Points: 1,970
Default

Re: Raising floor 1/8 inch


Quote:
Originally Posted by jlhaslip View Post
What is your joist spacing? That affects the floor and subfloor stiffness.
I rarely see tile on anything less than 1 1/4 inch subfloor thickness.
1 1/4 is the minimum.
__________________
The ads in my post are there without my permission. I do not endorse any of the products.
Semi-Retired Installer
Installing since 1973
rusty baker is offline   Reply With Quote
The Following User Says Thank You to rusty baker For This Useful Post:
Birch McMullin (08-30-2017)
Old 08-28-2017, 08:43 AM   #9
Newbie
 
Join Date: Aug 2017
Posts: 6
Rewards Points: 12
Default

Re: Raising floor 1/8 inch


Joist spacing is 16". Does the 1 1/4 include the backer board or do I need 1 1/4 of ply and then backer on top of that?

If I do 1 1/4 of ply, could I do Ditra (or similar product) instead of backer board to reduce the height a little bit? It looks like Ditra is easier to install too and might be more waterproof in a space that is going to be mudroom, laundry and pool bathroom.
Nealtw likes this.
Birch McMullin is offline   Reply With Quote
Old 08-28-2017, 12:21 PM   #10
Member
 
Join Date: Mar 2015
Location: Upper mid-west
Posts: 2,891
Rewards Points: 4,268
Default

Re: Raising floor 1/8 inch


Backer board is not considered structural so adding thickness does not affect the ability of the floor to hold a tile. FWIW, natural tiles like your slate require about twice the stiffness in the subfloor as do porcelain and ceramic and then also come with the maintenance of needing to be sealed. I would be considering a different tile, personally.
stick\shift is offline   Reply With Quote
The Following User Says Thank You to stick\shift For This Useful Post:
Birch McMullin (08-30-2017)
Old 08-28-2017, 01:31 PM   #11
Pro Flooring Installer
 
rusty baker's Avatar
 
Join Date: Feb 2009
Location: SW Missouri
Posts: 6,407
Rewards Points: 1,970
Default

Re: Raising floor 1/8 inch


There should be a chart on the John Bridge forum telling you what you need.
__________________
The ads in my post are there without my permission. I do not endorse any of the products.
Semi-Retired Installer
Installing since 1973
rusty baker is offline   Reply With Quote
The Following User Says Thank You to rusty baker For This Useful Post:
Birch McMullin (08-30-2017)
Old 08-28-2017, 05:11 PM   #12
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 6,026
Rewards Points: 754
Default

Re: Raising floor 1/8 inch


Hi Birch,

As mentioned, natural stone tiles require a much stiffer subfloor system than ceramic tiles do. By system, I mean both the framing and the subfloor. Simply, you need another layer of 1/2" min. underlayment-grade ply properly installed then you can install Ditra to save height.

But we need to start with the framing. Tell us the; size of your joists, if you can determine the species and grade, that would help. Measure the unsupported span of the joists. We already know the spacing is 16" oc. Waiting for your reply.

Jaz
__________________
TILE GUY - retired- TROY, MI - Method & Product suitability consulting.

MARBLE from ITALY & GREECE -PERLATO-PERLATINO-BOTTICINO-THASSOS-SIVEC-VOLAKAS-CALACATTA- NAXOS-Slabs-Tiles-Custom containers shipped to you - [email protected]
JazMan is offline   Reply With Quote
The Following 2 Users Say Thank You to JazMan For This Useful Post:
Birch McMullin (08-30-2017), rusty baker (08-29-2017)
Old 08-30-2017, 03:20 PM   #13
Newbie
 
Join Date: Aug 2017
Posts: 6
Rewards Points: 12
Default

Re: Raising floor 1/8 inch


Hi Jaz,

The joists are 2x10s (1.5"x9.25"). I believe the unsupported span is 11' or 11'6". If necessary, I could cut another section out of the floor to be sure. I don't see any markings on the wood to indicate species or grade, but they look like pressure treated (sort of yellowish-greenish tint) and look like they're in really good shape. I can only see two joists (one side each) though. Is there a trick to determining species if I'm not a pro at identifying wood?

Thanks!
Birch

Last edited by Birch McMullin; 08-30-2017 at 03:21 PM. Reason: remove text from previous post
Birch McMullin is offline   Reply With Quote
Old 08-30-2017, 03:27 PM   #14
retired framer
 
Join Date: Jun 2017
Location: Fraser Valley BC Canada
Posts: 28,286
Rewards Points: 234
Default

Re: Raising floor 1/8 inch


If you get real lucky there is a stamp about 2 ft from one end on one side.
If they were 12 footers it would still be there but it could be turn away from you because of crowning they get turned over.
Nealtw is offline   Reply With Quote
The Following User Says Thank You to Nealtw For This Useful Post:
Birch McMullin (09-01-2017)
Old 09-01-2017, 06:07 PM   #15
Newbie
 
Join Date: Aug 2017
Posts: 6
Rewards Points: 12
Default

Re: Raising floor 1/8 inch


Is it worth cutting out another section of plywood to look for the stamp?
Birch McMullin is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

Tags
flooring


Thread Tools
Display Modes

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to lay hardwood Maple 2 1/4 inch to allow for expansion TNDIYer Flooring 0 02-16-2016 11:52 PM
Raising Concrete Floor 1 Inch Toilet Bowl Flooring 2 08-02-2012 07:20 PM
Can I take out a load bearing wall (kitchen -living room) and use a 22 foot using 10 inch x 5/8s plate stell with 7 inch flange on bottom allanearle Building & Construction 2 05-09-2012 08:46 PM
Water Heater 1/2 inch pipes tke402 Plumbing 7 10-04-2008 12:19 PM
24 inch to 16 inch Centers dsearles Building & Construction 3 11-30-2005 11:20 PM




Top of Page | View New Posts