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Plaster Repair

Our house is from 1949 and since we purchased it in September we have experienced a myriad of unpleasant "fixes" by the previous homeowner. The latest can of worms I decided to open is in our master bedroom.

The wall facing the exterior had strange plastic seams and was wallpapered and then painted over. The 3 other walls are in relatively good shape. They are plaster. I needed to know why this wall was "smooth" so I pried one of the plastic seams off and yanked a chunk of the "fix" right off of the wall. It was thin particle board which had been glued to the wall. Nice. Along with that came many chunks of the plaster wall. It's a lovely MUSTARD yellow underneath. Delightful. I started scraping the glue off of the wall along with other loose chunks of plaster. 

I have begun youtubing various plaster repair, but this seems like a unique situation. It is NOT just a crack, but it is also not a gaping hole. I'm not exactly sure where to start. I think we need to continue getting the rest of the glue off of the wall along with loose pieces of plaster. 



Re: Plaster Repair

The existing plaster white coat ( finish ) has seperated from the plaster brown coat.

The paneling applied over the plaster most likely caused the problem due to moisture trapped between the panel & plaster. For a repair you will need to remove all the adhesive used to adhere the panels. If you can not get the adhesive removed than you will have to remove the White coat of plaster than refinish the finish coating. You can use a pre mix like USG Diamond plaster or Gold Bond Cal-Kote. For a very friendly plaster finish you could use this product Master of Plaster high in cost but the best plaster finish that i know off. 


Re: Plaster Repair


I fully agree with Clarence. I have used Master of Plaster and USG Diamond. They are both wonderful products. We have horse hair lime plaster in our house that I had a couple small places to patch. That yellow color kind of looks like the coat of sealant that is applied right after the finish coat is applied and dry so that the wall can then be papered or painted, while allowing the finish coat to breathe and fully cure. After working on our walls, the plaster is as smooth as a car fender or hood. A good quality wallpaper stripper will remove the glue with small amount of work. I like piranha wallpaper remover. I have also used some products from PlasterMagic.com They offer some nice lime plaster and other products to adhere loose plaster where the keys have broken.


Handy Andy In Mt Airy NC

Re: Plaster Repair

Thank you both for the input! So, the chunks that are chipping away-are they the coat of finish plaster? 
From what I could tell yesterday, I don't THINK we will have to chip all of it away. I basically am getting anything off that is loose and has separated from the gritty, cement-like underlayer (which I assume is a different step in the plastering process). 

When I started looking at plaster repair on youtube, people were drilling holes, filling with adhesive, and installing plastic plaster washers of some sort. I am not sure that this is necessary in our case, but I'm also do not want to attempt to "skip a step" since that never ends well. 

I will keep my eyes peeled for the products that you mentioned.

Re: Plaster Repair

The white material under the yellow is the plaster white finish coat.

The grey material is the plaster brown ( base coat ) All you have to do is skim coat with a new finish coat. The u -tube you see with the adhesive injection is used for loose or detacthed plaster from the wooden lath & the plaster washers are used to hold it in place untill the adhesive cures. You would not use the adhesive unless your plaster is delaminated or applied on wood lath. How old is this house ? if construsted after 1946 it would most likely have metal lath or a Gypsum lath ( rock lath )

Re: Plaster Repair

Clarence-thank you for the clarification. The house was built in 1949. The rest of the plaster in the house seems to be in decent condition. My old house was 1953 and the plaster was in perfect condition. There is some minor cracking in a few of the rooms but I actually thing (hope) it's the paint and not more than that. The previous home owners seemed to love using what seems like oil-based paint. When we prepped the living room to paint, the green that was on the walls came off in massive chunks (see https://operation1302.wordpress.com/2018/02/02/paint-paint-paint/). The chunks then stuck to all sorts of things (static cling). 

Thanks again for the feedback. Should be an interesting project when we get to it.

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