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05-15-2009, 12:47 PM
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#1
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Registered User
Trade:
Aftercare Service
Join Date: May 2009
Posts: 1
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Debonding between the concrete slab and levelling compound
Can anyone help me with the likely cause of the following problem. Debonding has occured between the surface of a concrete slab and the levelling compound used beneath carpet tiles, the compound is still attached to the underside of the carpet tiles but is very crumbly, the entire building (which is a new build primary school) is less than two years old.
Thanks in advance.
Jeff
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05-15-2009, 12:56 PM
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#2
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Handle It!
Trade:
Everything The Union Guys Do Not Want To Do
Join Date: Feb 2008
Location: Brooklyn, NY ~ Haverford, PA
Posts: 7,901
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As with all TASKS in life...............Preparation!
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05-15-2009, 01:05 PM
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#3
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Pro
Trade:
Builder/Remodeler
Join Date: Jul 2007
Location: Indianapolis, Indiana
Posts: 2,070
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Hard to say, but as Malco said... whomever leveled the slab didn't prep it right.
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05-15-2009, 03:06 PM
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#4
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Pro
Trade:
Flooring
Join Date: Aug 2004
Location: Portage County Ohio
Posts: 432
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I would say patch put over a dusty floor and or not primed first.
Not too much you can do about it now without a rip out
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05-15-2009, 03:09 PM
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#5
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celtic
Trade:
Flooring
Join Date: Feb 2007
Location: Scotland
Posts: 133
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Laitence still on the slab?
No preparation to get rid of it prior to laying the latex screed.
You'd be best ripping it all up, priming the floor and possibly use a water based screed over.
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05-15-2009, 05:02 PM
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#6
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Prosource Wholesale AB Ca
Trade:
flooring
Join Date: Apr 2009
Location: Edmonton Alberta Canada
Posts: 38
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screed laid over dusty/porus floor, no primer used, also can not see well from the pic, but if it is a power floated floor they also need primer first,
your best bet is to remove and start again, at least it will all come up easy,
I love jobs like this as i then get paid a very good rate to do it the right way for them.
__________________
ian@prosurceab.ca
www.prosourcefloors.ca
11204-178st Edmonton Alberta Canada T5S 1P2
The views expressed are personal and should not be taken as offical ProSource floorcoverings policy
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05-15-2009, 05:12 PM
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#7
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Pro
Trade:
Remodeling general
Join Date: Feb 2009
Location: Annapolis Md
Posts: 1,512
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HOpe the OP didn't do it. Sounds like the lawyers are coming 
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05-15-2009, 05:37 PM
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#8
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Knowledge Factory
Trade:
Certified Floorcovering Failure Investigator
Join Date: Aug 2007
Location: Austin, Texas
Posts: 1,289
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Looks to me like someone used a portland cement over a gypcrete substrate. Rut-Row!!!
No primer, if over true concrete.
Mixed to watery
No latex in the patching compound.
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05-16-2009, 02:35 AM
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#9
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Member
Trade:
Commerical Construction
Join Date: Nov 2006
Location: sydney Australia
Posts: 83
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the slab could have had curing coating sprayed on to the slab to stop craking as it is curred, the slab could have been green ie more than 5.5% MC when leveling was done.
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05-16-2009, 06:36 AM
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#10
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Pro
Trade:
LI,NY designer, new homes, renovation work, concre
Join Date: Mar 2008
Location: Long Island, NY
Posts: 4,162
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Hackery
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