Thread: P.v.a. Versus Primers......

Quote: Originally Posted by nhgfc here's a question for you all... I've removed a laminate floor at my house as it was always spreading at a certain joint and im sick of "jump & sliding" it back together. Dont tell me you dont know the jump and slide "move" cos i know you do!! anyway, the reason it kept popping at that certain part was down to the gargantuan drop the bitchumen/ashphalt...

Quote: Originally Posted by nhgfc my first post on here and its confession time!! I have ALWAYS pva'd at around 6 to 1 before any tiling i've done. But after sitting here reading every single post on this thread and my heart has sank like the titanic Cue the sleepless nights worrying about all those tiles i've layed over the years The really big question is - how many of those tiles are still up and still fine? Have you...

I've used both for priming

Quote: Originally Posted by Rainbow Hi I have a recently plastered en-suite which has a 50/50 emulsion primer on it. I want to tile the whole room and am going to use BAL Rapidset adhesive - do I still need to use a primer such as BAL primer?? Any help would be gratefully received. Thanks yes Rainbow, especially if it's a gypsum type plaster

I would get rid of the PVA. No point in having it potentially fail and ruin what will probably be a magnificent floor by taking short cuts.

imo,a light sand down and then give it a coat of acrylic primer.

It's actually a job for a friend ... I'm sure its ready mixed he bought ! .....I'll rub it and scratch it up with a blade first then ...cheers

I'm still unsure here ! Ive stopped using pva on plywood overlays ! Should I be using Bal SBR diluted or Bal APD on face to be tiled ? When the adhesive states to use a suitable primer ? Cheers

Many/most modern cement based adhesives are "primer free" to some extent. That means they don't require normally encountered surfaces, such as plasterboard or concrete, to be primed, BUT, there are almost always exceptions. The obvious ones are gypsum/anhydrite surfaces, (partly for the reaction risk, partly because they're very absorbant) and other surfaces which may react in some way when in contact with cement...

DESCRIPTION A water-based dispersion of a styrene-butadiene copolymer with a wide variety of uses in the construction industry, particularly as an admixture and bonding agent for cement and concrete applications. Once cured, the polymer is water and frost resistant. January 2005 Cl/SfB Yt4 APPLICATIONS & PERFORMANCE BAL BOND SBR USE & SERVICE CONDITIONS BAL BOND SBR can be used as a slurry coat when mixed with hydraulic cement...