Replastering old plaster.

Plastering questions and answers here please

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27188
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Replastering old plaster.

Post by 27188 » Wed Jan 23, 2019 11:16 am

Just started enjoying plastering. My question is why can I not plaster directly only old plastered walls. Walls brushed clean. I have skimmed with multifinish and it seems ok. Do I have to prep with 50/50 PVA each time and why?

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John
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Re: Replastering old plaster.

Post by wine~o » Wed Jan 23, 2019 1:03 pm

:welcomeuhm:

The main reason not to is that skirtings/architraves will look odd, light switches and sockets may also need longer screws fitting..

As to the 50/50 Pva/water, 1 part Pva to 4 or 5 parts water is the norm, the pva is there to control suction/ stop the plaster drying out too quickly.
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Re: Replastering old plaster.

Post by 27188 » Wed Jan 23, 2019 1:10 pm

Thanks. Always like to know why I am doing something. Just to check, it is not about bonding so scould put it on 4/1 night before?
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Re: Replastering old plaster.

Post by wine~o » Wed Jan 23, 2019 1:15 pm

If you do you'll need to do it again the next day, apply the Pva, leave until it's gone "tacky" then crack on.
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Re: Replastering old plaster.

Post by 27188 » Wed Jan 23, 2019 4:10 pm

Ok thanks
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Re: Replastering old plaster.

Post by 27188 » Fri Mar 15, 2019 1:04 pm

Hi, I am plastering small areas at a time at the moment. Want to do 1/2 a wall at a time. How do I join up the plaster sections to give a clean smooth finish? Any ideas,

Thanks
John
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Re: Replastering old plaster.

Post by cotswold builders » Fri Mar 15, 2019 5:18 pm

Fit a 3mm thin coat stop bead ( the wrong way round ) so you can plaster to it then remove when drying leaving a clean edge to skim to.
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Re: Replastering old plaster.

Post by wine~o » Fri Mar 15, 2019 5:19 pm

27188 wrote:Hi, I am plastering small areas at a time at the moment. Want to do 1/2 a wall at a time. How do I join up the plaster sections to give a clean smooth finish? Any ideas,

Thanks
John
Not ideal. put a batten up about halfway along the wall. plaster up to it. Remove batten once dry.

Plaster other side but dampen where the join will be... You'll probably need to sand along the join to get a better finish.

EDIT or what Cotswold said.
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Re: Replastering old plaster.

Post by 27188 » Sat Mar 16, 2019 10:47 am

wine~o wrote:
27188 wrote:Hi, I am plastering small areas at a time at the moment. Want to do 1/2 a wall at a time. How do I join up the plaster sections to give a clean smooth finish? Any ideas,

Thanks
John
Not ideal. put a batten up about halfway along the wall. plaster up to it. Remove batten once dry.

Plaster other side but dampen where the join will be... You'll probably need to sand along the join to get a better finish.

3mm batten helps get the layer of plaster correct depth, good
EDIT or what Cotswold said.
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Re: Replastering old plaster.

Post by London mike 61 » Sat Mar 16, 2019 11:03 am

If you are going to do half a wall at a time then ( as long as the first half is hard from the day before ) after removing the stop bead , you should be able to blend the two together by giving the join a rub over wth a sponge float and a light flick over with a wet paint brush.
Depending on how you get on, you may only need to use the paint brush which essentially turns the plaster into a wet mix and is easier to feather out.
I’m NOT a plasterer just diy but this is the best way I have found to blend two surfaces together.

Mik
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Re: Replastering old plaster.

Post by fin » Mon May 13, 2019 10:41 pm

ya could always put a line of scrim on the wall. then plaster just past it. then when its jus starting to set after youve flattened it off pull the scrim off leaving a straight edge. obv youd have to scrape off whatever plaster went past the scrim.
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