Plaster wall repair

From the photo it appears that there are two (2 ) finish coats which would indicate that it has been skim coated at some time.
Is this Plaster applied over wood Lath?
As for repair using the Big Wally or Plaster Magic products the method works very well. If you have a small area to repair that the small package of three tubes will cover it is about $ 150.00.
If you have a large area research this article
Morgan W. Phillips formulations APT vol. XII No. 2 1980
The adhesive formula for unfilled is the same as the Big Wally's only you will be mixing your own it will be cheaper but you may not find all the ingredients locally.
If you want to by pass all the proven methods just use Elmer's Glue as you would the Big Wally product along with the plaster washers.
You would save $$$ by just removing the damaged plaster & applying a replacement plaster product with a finish to match the existing.
WHAT PART OF THE WORLD ARE YOU LOCATED?

naf said:

Looking for advice on fixing a large floor to ceiling crack in a plaster wall. (see attached picture)


I've never had plaster walls before, so I'm a little lost. I'm not even sure which layers of the wall covering are showing.


Does it look like the finish coat of plaster is peeling from the bottom coat, or is that just a layer of texture/paint(/wallpaper?) coming loose from the actual plaster wall underneath.


In addition, I can push in and feel a lot of movement on the bottom plaster layer, so it appears to have become disconnected from the underlying lath. Looking at the internet it seems that the plastermagic drill holes/spray bonding agent/fill with adhesive/temporary screw method would be required here. Any recommendations on products available in US that don't cost $300 like the big wally stuff?

Click to expand...

Do you have photos taken from a further distance to show perspective? Hard to put this photo into perspective.

siffleur

You have two options at this point Option
( 1 ) Remove all loose or damaged plaster & replace with a premix like USG Structo-Lite or Gold Bond Gypso-Lite than apply a finish to match existing.
( 2 ) Remove all plaster & lath & replace with drywall to match thickness of existing plaster.

did you fix the leak?

Yes, roof replaced.