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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 05-22-2008, 01:37 PM   #1
Newbie
 
Join Date: Nov 2007
Posts: 1
Share |
Default

Poor quality concrete slab


We pulled up a carpet in preparation to install new tile flooring and found the concrete surface underneath to be sandy and cracked. The room seems to be a former porch which was enclosed and about 3-4 inches of substandard concrete poured over the original slab. We chipped out a hole and can see a good hard original slab under the new layer. There is a hollow sound when the floor is tapped so it obviously hasn't bonded to the original floor. It is quite clear that tile won't stick to this sandy surface. I thought perhaps Hardie backer board might be the solution but see on their website that it has to be laid with thinset too, which wouldn't adhere to a sandy surface. I am wondering if there are any sealing products which anyone could recommend or any other possible solution other than breaking up the concrete and repouring.

Phantom is offline   Reply With Quote
Old 05-22-2008, 03:25 PM   #2
Member
 
Join Date: Jul 2007
Posts: 1,518
Default

Poor quality concrete slab


If by sandy you mean that it isn't "sticking" to itself and is easily eroding away then I can't see how anything will bond to it since it will just separate from itself.

jogr is offline   Reply With Quote
Old 05-22-2008, 04:54 PM   #3
Tileguy
 
Bud Cline's Avatar
 
Join Date: Mar 2006
Posts: 9,681
Default

Poor quality concrete slab


Capping a concrete slab with amother concrete cast and seperating the two with a layer of sand is a common practice.

If the surface is casting off sand no matter what there is no fix for that short of removal.
Bud Cline is online now   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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Extending Concrete Patio Slab bobo Building & Construction 6 04-17-2008 12:17 PM
Filling hole in carport (concrete slab) chaddihimself Building & Construction 2 08-10-2007 12:50 PM
Remodel over sloped concrete slab PSL_Hokie Building & Construction 11 07-11-2007 05:14 PM
cracks in concrete slab causing home sale to fall though! help! bp13 Building & Construction 14 07-04-2007 12:32 AM
Concrete slab weeps moisture dale h Flooring 2 04-30-2005 10:29 AM




Top of Page | View New Posts

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