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 > The Mud Box

Sponsors


Reply
Thread Tools Search this Thread
Unread 06-15-2020, 04:39 PM   #1
makethatkerdistick
Registered User
 
Join Date: Oct 2017
Location: North Texas
Posts: 922
Gluing hardwood planks directly to slab?

Just learned that one of my colleagues is having hardwood floors installed directly to their slab on grade foundation. This just doesn't seem right to me, does it? I see no vapor retarder, just the bare slab (with some typical hairline cracks) onto which the installer is applying an adhesive with a notched trowel and then sticking the planks on top.

I thought a quality install would include vapor management and possible a subfloor/sleepers on top of a slab before the finished material goes on. Or am I wrong here? Just curious if this is an accepted practice.
__________________
Wolfgang
makethatkerdistick is offline   Reply With Quote
Sponsored Links
Unread 06-15-2020, 09:48 PM   #2
cx
Moderator emeritus
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 92,787
Glue-down nominal 3/4" hardwood over SOG has been accepted in this part of the country for years, Woolfgang. I was very, very skeptical the first time one of my customers asked me about it when she had contracted with a local flooring company to do such an installation in her house when it was probably 15 years old or so. Replacing bedroom carpet.

I talked with the flooring company on her behalf and they assured me that it was now an approved method according to the adhesive manufacturer, Bostik. I talked with Bostik and they assured me that they had had excellent success with such installations.

That particular job is still quite intact (maybe 10 years?) and I've seen it within the past year. Some problems with the wood finish, but not with the installation. I know of other such installations, but that's the one with which I'm most directly familiar. I've never done, nor had done, any such installations in any of my houses.

And I know that particular SOG to have a proper vapor barrier under the concrete.
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is offline   Reply With Quote
Unread 06-15-2020, 11:35 PM   #3
jadnashua
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

 
Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,313
Moisture can turn a hardwood into a pretzel. If that was covered when the SOG was poured and the SOG has dried out enough afterwards, it can work. Wouldn't want to do that over a green slab.

My preference is a floating floor over a cushioned vapor barrier, but clicking it together can take a bit longer depending on how familiar you are with it, and I think that slight cushion, even under a solid wood product can be felt versus gluing it down.
__________________
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.
jadnashua is offline   Reply With Quote
Unread 06-15-2020, 11:51 PM   #4
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
 
Tool Guy - Kg's Avatar
 
Join Date: Feb 2005
Location: Oak Creek, WI
Posts: 22,643
Bostik’s Best has had a fantastic reputation for years and years and years for installing hardwood to slabs. Handles moisture and bonding in one product. Hopefully, this is the product they’re using to install the wood.

__________________
Tonto Goldstein... but my friends call me Bubba

Help an awesome summer camp!
Tool Guy - Kg is offline   Reply With Quote
Unread 06-16-2020, 11:30 AM   #5
makethatkerdistick
Registered User
 
Join Date: Oct 2017
Location: North Texas
Posts: 922
Interesting. I suppose I learned something new then. I would assume their slab house has a proper vapor barrier between the soil and the concrete. The added benefit would then be to have no extra subfloor height to contend with. Given the overall dryish North Texas climate, I can then see how this would work.

When I bought my home I foolishly looked into hardwood floors. That was when I thought all my house needed was a coat of paint in the bedrooms and living room. I disabused myself of such flooring plans quickly once I learned about costly repairs that required my attention. Anyway, the guy who gave me a quote at the time suggested a subfloor with vapor barrier and sleepers. He was obviously doing it the traditional way. Too bad for him that I didn't have any money then (or now, for that matter).
__________________
Wolfgang
makethatkerdistick is offline   Reply With Quote
Unread 06-17-2020, 08:54 PM   #6
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
 
Tool Guy - Kg's Avatar
 
Join Date: Feb 2005
Location: Oak Creek, WI
Posts: 22,643
Quote:
Originally Posted by makethatkerdistick
...I would assume their slab house has a proper vapor barrier between the soil and the concrete...
Absolute pot shot in the dark to whether that’s true in this case.
__________________
Tonto Goldstein... but my friends call me Bubba

Help an awesome summer camp!
Tool Guy - Kg is offline   Reply With Quote
Unread 06-17-2020, 09:27 PM   #7
cx
Moderator emeritus
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 92,787
What Goldstein said, Wolfgang. Not everyone does proper preparation for SOG foundations just like not everyone does proper preparation for ceramic tile installations as evidenced by the threads in our Advice forum.

I'd wanna do some serious MVER testing before I committed to such an installation. I don't recall what Bostik's limit is for that application.

I'd start with several patches of poly taped to the slab in various places that were to receive the hardwood installation. If there is any indication of moisture, I'd then want to do a proper calcium chloride test.

My opinion; worth price charged.
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is offline   Reply With Quote
Unread 06-18-2020, 07:36 PM   #8
makethatkerdistick
Registered User
 
Join Date: Oct 2017
Location: North Texas
Posts: 922
The calcium chloride test is among my top ten favorite building tests. Only the lead test is more fun

I am not going to say anything and take away from their upgrade. Usually, people have disliked me for bringing awareness to possibly unpleasant things.
__________________
Wolfgang

Last edited by makethatkerdistick; 06-18-2020 at 09:33 PM.
makethatkerdistick is offline   Reply With Quote
Reply

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
Slab on Grade - Hardwood Floors diiulio Tile Forum/Advice Board 5 05-30-2014 10:57 AM
Concrete Slab Floor--Can I tile directly on top of it? EclecticGal Tile Forum/Advice Board 7 02-20-2008 12:00 AM
removing hardwood from slab coach Tile Forum/Advice Board 6 05-27-2005 09:16 PM
Tiling directly to Concrete Slab HouseOfJoe Tile Forum/Advice Board 13 03-16-2005 07:44 PM
install ceramic directly over hardwood? jmteck Tile Forum/Advice Board 5 11-03-2004 12:17 PM


All times are GMT -6. The time now is 10:25 PM.


Sponsors

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