Concrete floor recommendations

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John Benton

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Arms
Hi

I've got a concrete floor to tile in January and at the moment it is dry and has no damp. Although the plane is even, the floor is not level. I want to put down an SLC to level the floor, and tile, prior to kitchen being fitted. I have the following questions to make sure the customer doesn't have any future problems:-

1) Should I as a precaution put down a damp proof membrane prior the SLC going down?

2) What dpm would you recommend, liquid?

3) Should I prime, prior to putting down dpm, if a dpm is required? (I will of course prime if no dpm goes down)

Cheers

John
 
how do you know if it is dry?
 
The property is quite old but the floor is in a newer extension added, I would say probably about 30 yrs ago. Don't know if theres a dpm under current substate
 
Just to add, if you do use this product you will need to use a compatible SLC over it. F.Ball Stopgap 300 is one of them, there are a few suitable.
 
When I say its dry, this is what the builder has told me, who has done a lot of work in the house prior to me doing any of the floor. Whether he has measured moisture content is a different matter and I will contact him ASAP to find out
 
liquid dpms generally laid with a roller but to be done right you should use a notched trowel. there are loads of DPMs they are all much of a muchness. I prefer one coat systems generally cos Im a bit lazy and dont want to do two coats. they are not generally designed to cope with rising damp though so ditra might be a better option if no DPM under the slab.
 
Is this product applied by roller and would that size cover 20m2, I'm guessing it will

That size covers 30 m2, it's trowelled with a 2mm trowel (supplied with the kit) and then you roller over it. This process gives even coverage with no weak spots.
 
liquid dpms generally laid with a roller but to be done right you should use a notched trowel. there are loads of DPMs they are all much of a muchness. I prefer one coat systems generally cos Im a bit lazy and dont want to do two coats. they are not generally designed to cope with rising damp though so ditra might be a better option if no DPM under the slab.

So that would be a case of priming, Ditra, SLC and then tiling
 
Since found out that a large part of this floor was concreted with a dpm installed a couple of years ago. Would I still be better going down the Ditra, slc and tile route, do you think as a precautionary measure?
 

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