Using PVA Bonding

johnM20 · Post by **johnM20** » Mon Nov 18, 2013 11:19 am

Is there any benefit or detriment in using PVA bonding on new plaster board and Aquapanel before I tile onto the boards. I know it is recommended to use on plaster skim coat but not sure about new, unskimmed board.

wine~o · Post by **wine~o** » Mon Nov 18, 2013 11:23 am

johnM20 wrote: I know it is recommended to use on plaster skim coat but not sure about new, unskimmed board.

Quite the opposite... to-use-pva-in-paint-or-not-that-is-the- ... 18116.html

And the same can be said for tiling... http://www.ultimatehandyman.co.uk/tilin ... se_pva.htm

EDIT..Ooops Mis-read your post, of course it can be used to contol suction when applying a skim coat...for some reason I read "Mist coat"

Still shouldn't be used before tiling though...

johnM20 · Post by **johnM20** » Mon Nov 18, 2013 5:29 pm

Hi Wine~o
Thanks for your reply and the link. The tile adhesive that I have used in the past is Uni-Bond which states on the bucket "Very porous surfaces should be primed using a mixture of 1 part Unibond PVA to 5 parts water which must be allowed to dry". The question is is new plasterboard or Aquapanel classed as a 'very porous surface '?
Johnm20

wine~o · Post by **wine~o** » Mon Nov 18, 2013 5:35 pm

johnM20 wrote:Hi Wine~o
Thanks for your reply and the link. The tile adhesive that I have used in the past is Uni-Bond which states on the bucket

Ah...Ok so you are using a ready mixed adhesive..completely different ball game..

what size tiles are you using ?? anything above 250mm sq will be a no-no (IMHO) for a ready mixed addy...

However if you are using ready mixed then follow the manufacturers instructions.

johnM20 · Post by **johnM20** » Mon Nov 18, 2013 7:38 pm

The tiles are 330 x 250mm to cover a total area of approximately 14 square metres.

I'd thought of using powder adhesive as I've been told it is less expensive but because I may be doing the job over several days I thought ready mixed may be more convenient. I'm very happy to guided by someone who knows better than I do.

royaloakcarpentry · Post by **royaloakcarpentry** » Thu Nov 21, 2013 10:54 pm

The tiles are too big for ready mixed adhesive, they need to be on a cement based addy.

No excuses for ready mixed being used in a bathroom, anyway.

Unibond is shat adhesive for starters.

haveagohero · Post by **haveagohero** » Mon Nov 25, 2013 10:24 am

Unibond is pants! the fact that they still recommend PVA as a primer says it all really. As said use a cement based adhesive. Buy slow set and you can mix up a big batch at a time. Plasterboard doesn't need primed but I can't comment on aquapanel as I don't use it but I imagine it is also fine without priming

Using PVA Bonding

Using PVA Bonding

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