Debonding Between The Concrete Slab And Levelling Compound

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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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MALCO.New.York

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ChrWright

Hard to say, but as Malco said... whomever leveled the slab didn't prep it right.

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Mike Costello

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

Taranis

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.

ian@prosource

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.

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naptown CR

HOpe the OP didn't do it. Sounds like the lawyers are coming

Floordude

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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mrghm

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.

genecarp

Hackery

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