Plaster falling off wall

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JimMos

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A month ago I coated a ceiling and a sloping wall with 4:1 water/PVA. Next day I skimmed (multifinish) the ceiling and wall, then did a 2nd coat on the ceiling (ran out of time for the wall). The whole thing dried out and the ceiling came out okay.

Today I applied the 4:1 water/PVA to the wall that had only one coat of skim, think that I would apply another 2 coats and finish fhe job. But an hour later after the PVA water the dry skim started falling off. About a 1/4 of the wall has come off. The skim was only about 1-2mm thick (I know should have been 4mm). The wall before I started was painted skim on plasterboard.

Was has this happened ?
Was the skim too think and so reacted to the PVA water ?
What can I do now - I thought of hacking off loose bits and trying stronger PVA mix, and applying coats when tacky…..?

Any help would be appreciated !
 

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I can see that you are not a natural gifted plasterer.
By the look of the crack not the rake [as you call slope] I would think this is a plaster lath ceiling with a distemper finish. These ceilings do need an overboard to receive plaster.
Employ a plasterer to carry out the work and form a decent turn on the rake ceiling.
 
JimMos said:
A month ago I coated a ceiling and a sloping wall with 4:1 water/PVA. Next day I skimmed (multifinish) the ceiling and wall, then did a 2nd coat on the ceiling (ran out of time for the wall). The whole thing dried out and the ceiling came out okay.

Today I applied the 4:1 water/PVA to the wall that had only one coat of skim, think that I would apply another 2 coats and finish fhe job. But an hour later after the PVA water the dry skim started falling off. About a 1/4 of the wall has come off. The skim was only about 1-2mm thick (I know should have been 4mm). The wall before I started was painted skim on plasterboard.

Was has this happened ?
Was the skim too think and so reacted to the PVA water ?
What can I do now - I thought of hacking off loose bits and trying stronger PVA mix, and applying coats when tacky…..?

Any help would be appreciated !
Click to expand...
Have you got any pics of the ceiling that turned out okay?
 
Unless you bought the 29 quid pva from wickes . ( customer treated me other week. By god its f**k**g good)
If you got the cheap pva and did it 4 to 1 you just put white water on ye wall ye tight cu t
 
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