PVA, screed and self leveling compound (again)

[i_am_fubar]

So, biting the bullet, I chiseled off the bitumen from the concrete floor (not a DPM). Not a fun job.

Floor is unlevel... Really unlevel.... like 25mm dips over 2m un-level.

I then put down a 1:4 PVA primer (as I've read to do in the past on several sites) and the back of the PVA container itself.

I then put a sand/cement screed down in lowest areas and leveling compound on the 'not quite so low' to get the floor level with a plan to put a thin layer of SLC over the whole floor to get it smooth...

Only now I've been reading that essentially PVA = spawn of satan (as I've known about for tiling). And have read everything from "it should be ok" to "your floor WILL blow".

I'm floating a floor on top, so stresses imposed from that will be low.

But what is the chance of the PVA actually causing failure? It's been used for years and as far as I'm aware, most floors are still in once piece.

Fubar.

 

[maxr]

Hi Fubar, did you get anywhere with your query? I also put down some PVA that has fully dried and want to keep going with self levelling. Is this safe to do?
Thanks, Max

 

[dazlight]

Years ago everyone used pva even though you should use the primer made by the smoothing compound you are using. Should be ok.