Self levelling compound requires pva primer. - TilersForums.co.uk | Tile Forums

rhinoman · 07-07-2008

I bought some non latex based SLC from B&Q and it says on the packet to use pva as a primer before applying the SLC.

I'm a bit concerned that I'm only applying SLC to patches and there will be overspill of pva on other areas wher ther will be tiling and I've read here that tiling and pva don't mix. Any tips before I start?

Also, how soon after the screed has been laid can SLC be applyed, I'm trying to get the floor ready for someone else to tile it for me in a month or so's time?

Fred · 07-07-2008

I NEVER use PVA, but again, I NEVER get gear from there. Basically mate, PVA just sits on the surface like a piece of skin, it doesn't penetrate like the sealers you can get for such makers like BAL, ARDEX etc............

**whitebeam** · 07-07-2008

Why would you need to put slc on a new screed mate

rhinoman · 07-07-2008

Quote:

Why would you need to put slc on a new screed mate

The screed is not perfect and I'm using large format tiles, unfortunatly I was away whilst it was done and Screedflo was out of budget for this job.

Quote:

I NEVER use PVA, but again, I NEVER get gear from there. Basically mate, PVA just sits on the surface like a piece of skin, it doesn't penetrate like the sealers you can get for such makers like BAL, ARDEX etc............

So even though the pack says pva just use another sealer?

**whitebeam** · 07-07-2008

Try and do my own screeding when floor tiling rather than someone elses hill climb

**sWe** · 07-07-2008

Leveling compounds almost always contain a portion of hydraulic cement, such as Portland cement, and here's why it's not a good idea to use PVA with such products. Latex leveling compounds are probably less sensitive to PVA than mainly cement based compounds, as they often contain less cement, and forms of vinyl ester, but I still wouldn't use PVA.

**Dave** · 08-07-2008

I agree with marcus....And seen as tilers carry primers anyway why risk using pva....

Plus also be very careful with that b&q leveller they don't go much over 3mm or so in depth without cracking...

Thats why they are cheap....

**GazTech** · 08-07-2008

Why not forget the levelling and use Pourable thick bed adhesive, perfect for large format tiles & can go up to an inch thick....Gaz
BAL PTB (Pourable Thick Bed) Flexible

A highly polymer modified, flexible, rapid-setting, water-resistant, frost-resistant floor tile adhesive, especially suitable for fixing tiles, including fully vitrified and porcelain tiles to low porosity backgrounds and bases. Sulphate-resistant, cement-based, pourable, thick-bed solid-bed floor tile adhesive suitable for fixing ceramic tiles, quarries, natural stone and terrazzo in interior and exterior situations. Its consistency makes it particularly suitable for fixing large tiles and those with profiled backs. Back-buttering is not necessary. Suitable for use on concrete, cement:sand screeds, ceramic/quarry tile/terrazzo/hard natural stone, plywood overlay, vinyl tiles/sheet, mastic asphalt. BS EN 12004 C2F Adhesive

**Dave** · 08-07-2008

And is very expensive compared to levellers gaz.....

...but a very good product none the less.....

My recommendation for a good leveller is Ardex K15........great product and never cracks when used right......