I did a plaster skim in my spare bedroom the other week. Backing surface is OLD plasterboard - this was scaped of all old wall paper and residues etc, then sealed twice with a watery PVA, then a thicker PVA. As ever, I waited for the second coat of PVA to get 'sticky' before skimming. Plaster went on well (was in date too), and I left it to dry for about a week.
Now, I primed the walls today (watered down emulsion) and it all went well, until I got to the final wall...as I worked accross it, cracks started forming in the plaster, and it bubbled up - so I thought I'd see how bad it was, and the end result is most of that one wall is now back on the floor in a crumbly pile...! Nice....
I have done lots of plastering before, but this is the first time this has EVER happened to me! I suspect it may be the result of high background suction, and the PVA seal drying out too quickly, therefore drying out theplaster too quickly and killing any adhesion...
What do you guys think!? Obviously, I now need to re-skim this wall, but do not want the same thing to happen again!!
cheers!
Now, I primed the walls today (watered down emulsion) and it all went well, until I got to the final wall...as I worked accross it, cracks started forming in the plaster, and it bubbled up - so I thought I'd see how bad it was, and the end result is most of that one wall is now back on the floor in a crumbly pile...! Nice....
I have done lots of plastering before, but this is the first time this has EVER happened to me! I suspect it may be the result of high background suction, and the PVA seal drying out too quickly, therefore drying out theplaster too quickly and killing any adhesion...
What do you guys think!? Obviously, I now need to re-skim this wall, but do not want the same thing to happen again!!
cheers!