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plastering on plasterboard - cracks!?
littlejaffa
Posts: 2,251 Forumite
I've read/watched a million 'how to' guides and can't tell where i'm going wrong here - i'm hoping it's something simple you could help with 
Basically i've replaced a section of bathroom ceiling with plasterboard - whapped some tape to smooth it to the excisting ceiling and am trying to plaster the whole new plasterboard area
but everytime I do - it goes to crazy paving style cracking, all over within a few hours
the same plaster applied to a bathroom wall is also cracking but not as much
The reverse of the plasterboard is in the loft and near the eaves, I've not had the heating on and it's not been hot enough to dry it out to quickly (it's often still soft/damp the day after)
HELP? :undecided:undecided
Basically i've replaced a section of bathroom ceiling with plasterboard - whapped some tape to smooth it to the excisting ceiling and am trying to plaster the whole new plasterboard area
but everytime I do - it goes to crazy paving style cracking, all over within a few hours
the same plaster applied to a bathroom wall is also cracking but not as much
The reverse of the plasterboard is in the loft and near the eaves, I've not had the heating on and it's not been hot enough to dry it out to quickly (it's often still soft/damp the day after)
HELP? :undecided:undecided
Don’t ask what the world needs. Ask what makes you come alive, and go do it.
Because what the world needs is people who have come alive.
Because what the world needs is people who have come alive.
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Comments
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Have you put PVA on the plasterboard? Crazing is normally an indication that it hasn't been PVA'dEat vegetables and fear no creditors, rather than eat duck and hide.0
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Have you put PVA on the plasterboard? Crazing is normally an indication that it hasn't been PVA'd
No plasterer i know or use would PVA new plasterboard
If the board has been fitted for a while then yes
I would say its down to the mix or the applicationHi, we’ve had to remove your signature. If you’re not sure why please read the forum rules or email the forum team if you’re still unsure0 -
.Have you put PVA on the plasterboard? Crazing is normally an indication that it hasn't been PVA'd
yup - pva.
All the how to guides say use pva so i have. And have on other walls etc without problem.Don’t ask what the world needs. Ask what makes you come alive, and go do it.
Because what the world needs is people who have come alive.0 -
No plasterer i know or use would PVA new plasterboard
If the board has been fitted for a while then yes
I would say its down to the mix or the application
Doh! I'm being a numpty and didn't read the post correcetly. Of course you're right.
I agree - its down to the mix.Eat vegetables and fear no creditors, rather than eat duck and hide.0 -
It is the mix and the process, I reckon. I would not expect to see PVA used on plasterboard - it is designed to have the correct suction. Plaster is as little dry plaster as you can put into an amount of water to get a credible mix, rather than as much dry plaster as the water will take. And I think 2 skims is common - the first may have crazing problems, but the second, put on before the first dries, will deal with this.Hi, we’ve had to remove your signature. If you’re not sure why please read the forum rules or email the forum team if you’re still unsure - MSE ForumTeam0
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DVardysShadow wrote: »It is the mix and the process, I reckon. I would not expect to see PVA used on plasterboard - it is designed to have the correct suction. Plaster is as little dry plaster as you can put into an amount of water to get a credible mix, rather than as much dry plaster as the water will take. And I think 2 skims is common - the first may have crazing problems, but the second, put on before the first dries, will deal with this.
just checking i've got this right - your suggesting i plaster a 2nd coat - while the first is still wet...and cracked??Don’t ask what the world needs. Ask what makes you come alive, and go do it.
Because what the world needs is people who have come alive.0 -
2 coat technique is to stop the substrate from sucking the moisture out too quickly
Apply first coat, Very thin (1-2mm) to full area
Then go back over with 2nd coat immediatlyHi, we’ve had to remove your signature. If you’re not sure why please read the forum rules or email the forum team if you’re still unsure0 -
Hmm. "Wet". There is more to plaster than wet and dry.littlejaffa wrote: »just checking i've got this right - your suggesting i plaster a 2nd coat - while the first is still wet...and cracked??
Wet and set. Don't wait until it is dry, or you will be back where you started. Don't do it before it is set, or it will probably crack.Hi, we’ve had to remove your signature. If you’re not sure why please read the forum rules or email the forum team if you’re still unsure - MSE ForumTeam0
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