Repairing an internal wall...

[BigLad21]

Evening folks,

I'm after a little advice on plastering an internal wall. My house was built in the late 60's early 70's and i have single skin breeze block internal walls. While creating a channel in one side of the wall for some new electrical work the plaster on the other side has all fallen off.

I need to repair the wall but want to go about it properly. My last resort would be to get someone in, but my 'guy' is busy for the next 6 weeks and I can't wait that long so I'm going to fill it myself. The area is only about 300 square mm and about 10-15mm thick. Obviously normal filler is inappropriate so i'm guessing i'll just buy a bag of plaster from a builders merchant, mix it as per the instructions and apply in small stages. I've read about applying PVA to the area to allow the wet plaster to bond with the exisiting wall. Is that required, what are peoples recommendations?

Thanks in advance

 

[NickB_99]

While creating a channel in one side of the wall for some new electrical work the plaster on the other side has all fallen off.

I need to repair the wall but want to go about it properly. My last resort would be to get someone in, but my 'guy' is busy for the next 6 weeks and I can't wait that long so I'm going to fill it myself. The area is only about 300 square mm and about 10-15mm thick.

The area sounds small, but the fact some has fallen away, the surrounding area may not be in good shape. I would be wary of this and do some tapping around the missing bit to see how hollow it sounds. You will need to assess if the patch is good enough or more needs to come off to be redone properly.
It is possible just patching in this missing bit may strengthen the existing that surrounds it.

Obviously normal filler is inappropriate so i'm guessing i'll just buy a bag of plaster from a builders merchant, mix it as per the instructions and apply in small stages. I've read about applying PVA to the area to allow the wet plaster to bond with the exisiting wall. Is that required, what are peoples recommendations?

Bonding would do. The diluted PVA will help control the suction of the blocks.
I would do some more reading up on this forum for a detailed post on patching.
You may want to rule off level with the existing, or wish to leave the new surface slightly below the surrounding. You need to cover and blend in with multi-finish - filling your Bonding slightly below the level of existing will make the blending in a bit easier.
Do your Bonding in 2 coats (15mm is quite thick and it may slump doing in one).
Scrim tape over the join of new Bonding with existing, before applying multi-finish.