Home>Discussions>INTERIORS>Molding & Carpentry>What is this stuff? Old drywall? Old plaster?
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LeeW
What is this stuff? Old drywall? Old plaster?

OK, total rookie question. :o

This stuff is throughout our 100 year house. It feel like plaster, but it many (too many) spots the enire "sheet" moves if you push on it- like a drywall sheet would. But it's plaster, with some sort of hair in it. Nails go in it like plaster, but I thought plaster was "smeared" onto walls, and then locked into the lathe. I can't find any place where there appear to be keys.

How do we repair this? There are some walls that are going to have to come down or be drywalled over, but some areas just have a ding or crack to be fixed. Thanks.

www.flickr.com/photos/leezybeezy/4749500462

ps- going to go join a place to get theses photos in....

Timothy Miller
Re: What is this stuff? Old drywall? Old plaster?

Hi horse hair plaster- ok what did i win?
My 100+ home had it when it is still attached to the wood lath then its sound. But yours sounds like its toast. removed mine and the lath and will drywall it after i get the insulation in this summer.

Re: What is this stuff? Old drywall? Old plaster?

AND WE HAVE A WINNER- thanks Timothy.

So, if I have areas that the whole things moves, it must come down? That actually gives me an excuse to just hit it with a hammer!! LOL. UGH- DIRTY work, I take it. But some areas are still tight to the wall. Lots aren't. The house has shifted and sagged- a whole other story and project- and I'm sure that has contributed to whole walls being loose. Yes- whole walls. UGH.

Thanks again.:D

Re: What is this stuff? Old drywall? Old plaster?

PS- if you live in Maine, your prize are some fresh eggs! ;)

JLMCDANIEL
Re: What is this stuff? Old drywall? Old plaster?

What has happened is the keys have broken off. The keys are what holds the plaster to the lath. I personally prefer repair over tear off if possible. You might want to take a look at this http://www.plastermagic.com/ as a solution rather than demolition.
Jack

Hank Bauer
Re: What is this stuff? Old drywall? Old plaster?

I would follow JLMCDANIEL's advice and use big Wally's adhesive.
At this date I am using it on a church dated 1820.
Have used 72 tube as of 25 June and will use another 100 tubes by 17 Sept. it works very well.
Have been using it for the past 4 years.
Than patch using sanded gypsum plaster.
After the adhesive and patching are complete.
I would reccomend the wall be skim coated with a Restoration Plaster or a Venetian plaster.
My choice in order.
1 Master of Plaster
2 Franklin Stocco Venetian Plaster
3 TexSton
4 American Clay plaster
5 Litex Venetian
2,3,4 & 5 will require a bonding agent.
If one of the above is selected make sure it is LIME BASED.
Before you demo the plaster check with your local Historical Society
or Gov't and see if there is any advantage for tax's if Plaster is retained or maybe value to real property.

Sombreuil_mongrel
Re: What is this stuff? Old drywall? Old plaster?

Hi,
This is what the plaster keys should look like.

This is a new horsehair/lime plaster wall in a house we restored last summer. It drove the plasterer nuts (he was pretty far gone to begin with) and he drove us nuts.
The "key" really is getting the horsehair mixed in evenly.
Scratch coat:

S_M

Timothy Miller
Re: What is this stuff? Old drywall? Old plaster?
LeeW wrote:

PS- if you live in Maine, your prize are some fresh eggs! ;)

Hi i wish i was closer as in Oregon today would drive over for the eggs and help with the plaster removal. The adhesive mentioned in other post how much does each tube cost?

Hank Bauer
Re: What is this stuff? Old drywall? Old plaster?

If I break down my order per tube cost is $15.33 each.
Well worth the cost to retain the orginal plaster.
If you would like to formulate your own mixture look up the following.
Adhesives for the Reattachment of Loose Plaster by Morgan W. Phillips
APT Vol.XII No 2 1980
This system was developed in 1979 for a project in St. Johnsbury VT.
Also used in The Senate Reception room ceiling in The Massachusetts State House.
Also Mt. Vernon and Kenmore in Virginia.

Re: What is this stuff? Old drywall? Old plaster?

Holy cow- I have lots of reading to do!! I thought, from watching TOH, that you could repair plaster. Good point about checking with the historial society! The man who had this farm is well known in the area, but I'm not sure if the house is historically significant. I'm told we have the biggest barn in the county, too.

At this point, nothing immediate is going to happen. I was just trying to make the room presentable- it is a horrible shade of blue. We had to pull the rugs out due to cat urine, so I wanted to tackle the walls while I was at it. I rented a steamer and it is [email protected] It leaked so much that the water was running down the wall. It made the painted-over wallpaper a *tiny* bit easier to remove, but not much.

Anyway, most of the areas that are loose also have cracks. I guess when we decide to really dig in the walls, we look into repair. The house needs to be jacked up in some places, so we REALLY don't want to do too much- that we'll undo when we jack it up.

Thanks for your input. I am going to copy it all down for when we do the room up right.

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