Old house walls crumbling inside plaster

Question

What’s best for doing up an old house with crumbling plaster inside and flaking ?

Nathan · Accepted Answer

Hi mate If the plastered walls are blown and coming off the walls , I’d definitely recommend taking it back to bare brick and then reboarding the walls using plaster board adhesive and plasterboards , (also know as dot and dabbing) hope this helps 👍🏻
Strong Plastering

Simon · Answer

Hi, if it is blown enough then yes it wants knocking off but a replaster will need to be looked at for best method, are walls stone? is there a cavity ect, certain methods can be costly in the long run causing damp issues so how you finish wall is all down to what the walls are .

Daniel · Answer

Remove crumbling plaster and fill with bonding coat before plastering 
Or if the walls are crumbling all over 
Remove old plaster back to brick work and plasterboard walls and ceiling

Elliott · Answer

Depending on the age and location of the house crumbling plaster can be a sign of previous moisture damage or even original plaster that could be up to seventy years old. The best solution would be to remove all lose plaster and reinstate with new backing plaster such as gypsum hard-wall, with a skim coat over the top for the paint.

Other options would be plaster board every thing with a skim coat for a cheaper alternative.

Chris · Answer

To repair crumbling old plaster, completely remove all loose material down to the solid base (masonry or wooden lath). Apply a PVA bonding agent or plaster primer. Fill large gaps with bonding plaster, let it cure, and finish with a lightweight ready-mixed joint compound before sanding and painting.
Also depends if lime has been used which can fail after years must use lime again otherwise house will not breathe.

Christian · Answer

Before repairing the plaster, it is important to identify the cause of the problem. Common causes include:
Rising damp
Penetrating damp
Condensation
Salt contamination in older walls
Failed or loose plaster
Recommended approach:
Identify and fix any moisture or damp issues first.
Remove all loose, hollow, and crumbling plaster back to a sound surface.
Treat any mould or salt contamination if present.
Repair small areas using suitable backing plaster and finish plaster.
For larger damaged areas, consider overboarding with plasterboard or completely re-skimming the wall.
If damp is still present, replastering alone will not solve the issue because the new plaster is likely to fail again. Always fix the underlying moisture problem first.
As a professional plasterer, if more than one-third of the wall is loose or damaged, it is often more cost-effective and produces a better finish to remove the defective plaster and re-board or re-skim the entire area rather than carrying out multiple patch repairs

Mark · Answer

Hi , all depends on how bad exciting  plaster is !
If plaster has detached  from wall it will need to be removed , if it’s just old and dry , you could use thistle Bond it , and maybe put full sheets of mesh if walks have lots of cracks ? Thistle Bond it is easy to use wrong as it need a good mix before use .,I tip contents into a larger bucket so mix is easier. Once you have PAINTED walls  with bond it , apply two coat Bonding , and two coat finish plaster. . Hope that helps 👊🏻

Ryan · Answer

If it’s just certain sections chop of the loose stuff and fill with hardwall or bonding, if it’s the entire lot hack it all of and you can dot and dab the walls with plasterboard to get them perfectly straight, some people do float and set but majority do plasterboard , just put lots of adhesive behind certain sections where you might fix stuff to the wall so it has something to grab to. Then use multifinish or board finish then ready to paint, would not recommend trying to do this if your not a plasterer 👍

Jason · Answer

Hi. Depending on the scale of it, you would need to take the old plaster back to brick

Nigel · Answer

Generally.
I would remove any very loose patches and then patch up with either sand anc cement.
Pva the remaining walls and skim with multi finish 
👍

Old house walls crumbling inside plaster

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