Blown plaster -- gluing it back to wall.

bearing in mind that you are still going to have to plaster the wall this seems a bit pointless.

 

If your happy with it, you don't really need any advice Hb , go with your flow lol.

 

I love your username, hopefulbuilder...

How well does that foam adhere to dusty surfaces?

 

If you think it's worked then all well and good, but surely it would be quicker to knock it off and replaster the wall.

 

um, let us know how it goes

 

Cool. The fact that you could show the foam had spread quite a distance is good.

I recall trying something similar a few houses back, but using PVA. Same idea - drilled some shallow holes, sucked out the dust and then tried to inject PVA in to the gap. I'm sure it helped a bit!

 

I think the general consensus with the spreads i have worked with on blown plaster is: if it sounds hollow but otherwise sound - leave it. If it starts falling off when you are testing its soundness: knock it off until you get to a sound part. Just my 2 pence worth!

 

thanks for posting HB. I have just tried this technique. With blown render and it works. I used soudal fix all

drill holes at around 200mm centers and then squeeze the foam in. would have stripped the plaster back to brick, but coving was in place so was able to secure the scrathcoat and carefully remove the finishing skim coat as it was cement render.

 

This method has been mocked on this forum and elsewhere but for what its worth, one of my walls had a large area (probably 3ft x 4 ft) where the plaster had blown. The plaster surface was excellent so I was reluctant to hack it all off. My attempts to patch small areas at a time made it look worse. So I drilled a horizontal line of small holes, sloping downwards, just above the blown area and then injected in some diluted PVA adhesive. Repeated the injection process several times letting it set in between, until no more would go in. Filled the drilled holes with Polyfilla. The affected area is now rock solid. So it worked for me and saved a considerable amount of time and expenditure.

I would be wary of using foam filler instead of PVA since (although VERY sticky) it can exert a considerable pressure when expanding.

 

Hi,

Just looking for some advice. How loose was the plaster on the wall?

I am currently redecorating and have found a large section of blown plaster on a chimney breast (the size roughly of the blown area is (1.6m wide and 1.1m high) would your technique work for this?

When the blown area is pushed there isn’t any flex in it but I don’t want to put foam behind it and it get pushed off!

Thanks in advance,

Ben

 

Hopefulbuilder hasn't posted since 2015 and Legin1958 since 2016 so I don't think you are going to get any advice

 

Both buried under blown plaster ?

 

Always worth a shot!

 

My father worked on bomb damaged houses in London after the war. His tip on blown plaster was to use very diluted finishing plaster run behind the blown plaster from a small piece of plaster that had been removed. I have tried the PVA as in post 12 a number of times and it has worked well for me and saved the mess of trying to replaster a wall in an otherwise well finished house with carpets down. I use an old one litre plastic oil container with the long plastic tube on the top so I can get a little bit of pressure into the hole while tapping the plaster around the hole to get the PVA to move around.

 

Drywall adhesive (dot and dab) mixed to plaster/single cream consistency trowelled lightly into the cracks and loose areas of plaster also works to secure the loose, but the area needs to be dampened with diluted PVA first.

 

Well I’ve gone back to brick on the whole house because of blown plaster. One small room I thought was ok so skimmed has since blown so I’m gonna give this a go.failing that it’s all coming off.

 

A whole house of blown plaster makes a lot of s**** to shift!!