Dab Not Sticking To Thermal Plasterboard

[Renovation]

My plasterer has dabbed some Gtec XPS boards and whilst the dab has stuck to the wall the boards can be pulled off cleanly.

My supplier said the dab ought to be spread over the whole board as well as the wall being dabbed - plasterer says he's never had a problem.

The celotex boards come with a paper backing - which have stuck but these Gtec boards have a polystyrene back - the only reason I bought them is they are available locally whilst the celotex ones had to be ordered in and I didn't have time to wait.

[james7]

I have seen this used a lot recently with very good results. Dries quickly and does stick well. It will take up gaps in voids a bit as well so the wall behind does not have to be perfect.

http://www.selcobw.com/bond-it-polyurethane-constr...

[Rosscow]

I'm not a big dot and dab fan - batten the wall and screw it on

[Renovation]

i've just called Siniat Tech Line - they say thermal boards only need more dab than std boards.

But as my reveals were around 50% covered and they still haven't stuck that's no help.

[roofer]

Crazy foam, mist the wall and board first, sticks like st to a blanket.

[Neil - YVM]

roofer said:

Crazy foam, mist the wall and board first, sticks like st to a blanket.

this ^

http://www.screwfix.com/p/soudal-expanding-sticky-...

[Simpo Two]

Renovation said:

My supplier said the dab ought to be spread over the whole board as well as the wall being dabbed

Which is then not a dab!

[Mr GrimNasty]

You should have some mechanical fixings regardless. You could probably remedy the problem by using a semi-foaming pu glue on top of the dabs, sets very quickly and it won't expand and push every thing out of line like foam. e.g. http://www.screwfix.com/p/evo-stik-polyurethane-wo...