Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Flooring > Tiling, ceramics, marble

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-11-2012, 08:27 AM   #1
Member
 
Join Date: Jun 2011
Location: Atlantic Canada
Posts: 378
Rewards Points: 250
Default

Decoupling membranes and thickness


What options are there for a decoupling membrane? I am going to put down ceramic in my kitchen. I've checked the spans (2x7.5" 10 feet and 24" oc) and they are good. The floor is two layers of 3/4" T&G boards which I will
A) remove one layer of T&G, add 3/4" exterior grade plywood screwed every 4", modified thinset with 1/4" trowel, 1/2" backer board (or Ditra XL), unmodified thinset with 1/4" trowel, and tile or
B) Leave existing floor, add 3/8" exterior plywood screwed, decoupling membrane (ditra or other?), tile.

The aim is to match the height of the 3/4" hardwood in the adjoining room (which is on top of the 2 layers of T&G board). What else can I use for a decoupling membrane that would bring my height down? Do I have any other options to consider? Thanks!

shazapple is offline   Reply With Quote
Old 01-11-2012, 09:06 PM   #2
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 4,071
Rewards Points: 2,000
Default

Decoupling membranes and thickness


Hi,

Quote:
I've checked the spans (2x7.5" 10 feet and 24" oc) and they are good.
Please tell me which species and grade of 2x8" joists spaced 24" apart yields a deflection rating higher than L360 at any load factor other than the basic 40/10 live/dead load. I'll await your answer.

Jaz

__________________
Tile 4 You LLC Troy, MI

DITRA Installs - KERDI Watertight-Mold-Free Showers. I have NEVER made a mistake, I thought I did ONCE, but, I was WRONG! A+ BBB rating - est. 1987 - over 50 yrs. exp.
JazMan is offline   Reply With Quote
Old 01-12-2012, 07:50 AM   #3
Member
 
Join Date: Jun 2011
Location: Atlantic Canada
Posts: 378
Rewards Points: 250
Default

Decoupling membranes and thickness


Either Pine or Douglas Fir. It is an older house, so it is rough sawn and true 2" by 7.5". The span is also closer to 9 feet but I went to 10 for a bit of a safety factor.
shazapple is offline   Reply With Quote
Old 01-12-2012, 04:34 PM   #4
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 4,071
Rewards Points: 2,000
Default

Decoupling membranes and thickness


That info would have been helpful if it had been included in your original post.

How come two layers of 3/4" boards? Is the top layer hardwood flooring? If so, that is different than two layers of 3/4" boards, (planks). Is the first diagonal over the joists?

You'll want the top layer to be plywood, not planks. Depending on what the top layer is will determine my answer as to which way to finish. Get back.

Jaz
__________________
Tile 4 You LLC Troy, MI

DITRA Installs - KERDI Watertight-Mold-Free Showers. I have NEVER made a mistake, I thought I did ONCE, but, I was WRONG! A+ BBB rating - est. 1987 - over 50 yrs. exp.
JazMan is offline   Reply With Quote
Old 01-13-2012, 12:09 PM   #5
Member
 
Join Date: Jun 2011
Location: Atlantic Canada
Posts: 378
Rewards Points: 250
Default

Decoupling membranes and thickness


Thanks in advance for the help, I know you and Bud are the guru's around here! The house is over 100 years old and originally started out as a cottage, so a softwood T&G floor was probably the easiest floor to put down. Here's the original construction, which still remains:
2"x7.5" rough sawn joists 10ft long, 24" oc
3/4x4 T&G pine plank subfloor perpendicular to the joists
3/4x4 T&G pine plank finished floor parallel with the joists

The living room floor (which butts against the kitchen floor, covered by a metal transition strip) has 3/4" T&G oak hardwood floor parallel with the joists (in addition to the original construction). The kitchen currently has 1/4" plywood, vinyl, 1/4" plywood, and another layer of vinyl (in addition to the original construction) and butts up against the living room with a metal transition strip. The oak is the floor height I am trying to match, as it will be staying.

If I remove everything in the kitchen except the T&G subfloor I'll go with 3/4" plywood, ditraXL (or 1/4" CBU), and tile (very close to oak floor height)
If I leave both layers of T&G boards, I'll go with 1/2" plywood, decoupling membrane, and tile. What are my options for a thin decoupling membrane? (remember I am trying to match the oak floor height, and assuming 3/8 tile I'm already a bit above)

Thanks again for the help!

Last edited by shazapple; 01-13-2012 at 12:13 PM.
shazapple is offline   Reply With Quote
Old 01-13-2012, 08:57 PM   #6
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 4,071
Rewards Points: 2,000
Default

Decoupling membranes and thickness


Quote:
If I remove everything in the kitchen except the T&G subfloor I'll go with 3/4" plywood, ditraXL (or 1/4" CBU), and tile (very close to oak floor height)
Ditra XL + tiles should give you the best height match. Ditra XL was developed for just this application. (to match up to 3/4" hardwood).

If you go the other way, (1/2" ply, Ditra, tile), you'll be about 1/4" or so higher than the hardwood side.

Jaz
__________________
Tile 4 You LLC Troy, MI

DITRA Installs - KERDI Watertight-Mold-Free Showers. I have NEVER made a mistake, I thought I did ONCE, but, I was WRONG! A+ BBB rating - est. 1987 - over 50 yrs. exp.
JazMan is offline   Reply With Quote
Old 01-14-2012, 09:29 PM   #7
Member
 
Join Date: Jun 2011
Location: Atlantic Canada
Posts: 378
Rewards Points: 250
Default

Decoupling membranes and thickness


Thanks Jaz for your help. I'll be ripping up the floor this coming week.

shazapple is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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





Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.