Mapei renovation screed primer

EatingSnakes · Apr 28, 2019

Hey guys

I've got a new, tampered concrete floor.

Not sure if I need primer before applying Mapei Renovation Screed

If yes, I've got a ton of SBR. Will this work?

The screed will be containing UFH pipes.

Thanks

ES

Italy · Apr 28, 2019

.............

Qwerty · Apr 28, 2019

As above, it's always best to follow manufacturers instructions and use the same primers. You could phone Mapei technical dept tomorrow and ask your question but I'm pretty sure they will stick to the primers listed above. They may possibly say that Primer G will suffice but to be honest your SBR will work and plenty here would use it with no issues. It does also depend if it is the correct type of SBR

EatingSnakes · Apr 28, 2019

Thanks guys

Yeah I had a good search of the forum and have seen plenty of people use SBR but just wanted to make sure as its my first time.

Its ever build brand Bonding SBR

One Day · Apr 28, 2019

I'd be happy using SBR. Diluted probably 3:1 as everbuild is quite diluted anyway.
Make sure you're not bonding dust though - vaccuum first.

EatingSnakes · Apr 28, 2019

Thanks mate.

So that's 3 parts SBR to 1 part water.

Thanks so much

Wayne Brown · Apr 28, 2019

What sort of underfloor heating going down? Electric or a wet system any insulation going down first

EatingSnakes · Apr 28, 2019

Wet.

got 100mm kingspan in place.

Wayne Brown · Apr 28, 2019

Like this ? 100mm celotex laid on the slab a polythene dpm laid on top the celotex and cut and taped expansion foam strip added all around the perimeter of the room and structures this one will have a flow screed pumped in to a 90mm thickness , please explain how your floor is being done em I missing something?

EatingSnakes · Apr 28, 2019

From bottom to top:
DPM
100mm Kingspan
DPM
100mm concrete
16mm pipe
28mm mapei renovation screed
Tiles

Dumbo · Apr 28, 2019

I dont know this as I am not familiar with mapei products but I think it's worth checking with mapei that 12mm over the pipes is sufficient ..

WetSaw · Apr 28, 2019

....and that the concrete is dry enough.

Wayne Brown · Apr 28, 2019

Somethings not right here the make up of the floor is not one I have come across minimum cover is normally 75mm sand and cement screed or a pumped flow screed over the pipework , dont know how far you have got but a overlay system may be a better choice as attached you can tile straight onto it ? no need for slc , please check before carrying out any further work .

EatingSnakes · Apr 28, 2019

Yup.
See my previous thread on the topic.
The original plan was to have overlay boards and then tile on top but it turns out I've got 28-30mm space to fill between the tiles and concrete so I was recommended the mapei renovation screed.

Wayne Brown · Apr 28, 2019

When did you post the thread please ?

TF

Italy

Qwerty

TF

One Day

TF

TF

TF

TF

TF

Dumbo

WetSaw

TF

TF

TF

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