Ultraplan Renovation screed - priming and layering

[Stooby]

Hi,

The floor I'm working on is in a bad state, in some parts needs 50mm of screed, so I've put down one layer of ultraplan to bring it up a bit (since its max depth is 30mm and at the time I did not have enough to complete the job) and have left it for 1 week. This was over an old pitted concrete floor, primed with Eco Prim T (1:1 dilution as per Mapei's spec).

So far it seems to have bonded very well to the old surface.

I'm nearly ready to throw the final layer on, my question is do I need to prime ontop of that 1st layer of ultraplan?

Also should I give the unscreeded parts another treatment of Prim T before I put the final layer on?
The floor has had some light foot traffic since the first priming.

Thanks,
Stu.

 

[Stooby]

Had a response from Mapei tech: it's a water based screed, therefore it needs to be primed before adding another layer.

 

[White Room]

As you say a primer would be required and with the foot traffic there'll be dust and whatever on the floor....

 

[Stooby]

As you say a primer would be required and with the foot traffic there'll be dust and whatever on the floor....

Thanks, screed went down lovely and so far appears to be well bonded.

Would you recommend giving it a bit of a scrape/sand and then primed before the adhesive goes down?

Product info suggests it can be tiled onto "without further attention" ?

(Adhesive will be Keraquick.)

 

[Gazzer]

I dont usually prime slc before tiling. A quick wipe over with a damp sponge to remove any dust suits me.

 

[Stooby]

Thanks for the responses, it's looking good.