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-   -   What kind of wallboard do I have? (http://www.diychatroom.com/f19/what-kind-wallboard-do-i-have-74446/)

tripower 06-23-2010 09:02 AM

What kind of wallboard do I have?
 
My house is typical early 60's tri-level (VA). I have become very familiar with my wall board but it is a little confusing as to what exactly it is.

It is approximately 3/4 inch thick. On the back (the side facing the studs) it looks like typical 1/2 inch drywall. It even says "gypsum board" printed on the back. On the outer face (the side facing the room ) it appears to be made up of a 1/2" or so of what appears to be a "rocky" plaster type material. What is this and why do they build the walls with this material?

canadaclub 06-23-2010 01:22 PM

That's exactly what is is...gypsum board (aka gyproc). Very heavy which is why, if you notice, the sheets are smaller than 4x8. It was the 'drywall' of the sixties. Chances are, if you tear a wall down, you will also notice metal mesh in the corners. You have to cut all around the ceiling with a sawzall to get a straight cut.

I reno'd my house years ago with the same stuff and when I ripped the walls apart I found that the contractors disposed of all the scrap inside the walls:furious: Every single wall had scrap in the cavities almost up to the ceiling! I had to double the size of the disposal bin I had ordered.

tripower 06-23-2010 02:10 PM

Quote:

Originally Posted by canadaclub (Post 460385)
That's exactly what is is...gypsum board (aka gyproc). Very heavy which is why, if you notice, the sheets are smaller than 4x8. It was the 'drywall' of the sixties. Chances are, if you tear a wall down, you will also notice metal mesh in the corners. You have to cut all around the ceiling with a sawzall to get a straight cut.

I reno'd my house years ago with the same stuff and when I ripped the walls apart I found that the contractors disposed of all the scrap inside the walls:furious: Every single wall had scrap in the cavities almost up to the ceiling! I had to double the size of the disposal bin I had ordered.

I didn't have the trouble with the scrap but the wire mesh yes I have that. But what is the plaster like material on the outside and why use it? Why not just use the gypsum material like with standard drywall?

Troglodyte 06-23-2010 02:19 PM

I asked this almost exact question like a month ago, the outer coat is a 'scratch' coat which should then have a thin finishing plaster coat on that. The scratch coat provides a better base for the finishing coat and also will be used to lock in the mesh, where this is mesh. At least that is what I have and it sounds like you just described it.

tripower 06-23-2010 02:21 PM

Quote:

Originally Posted by Troglodyte (Post 460410)
I asked this almost exact question like a month ago, the outer coat is a 'scratch' coat which should then have a thin finishing plaster coat on that. The scratch coat provides a better base for the finishing coat and also will be used to lock in the mesh, where this is mesh. At least that is what I have and it sounds like you just described it.

Yes, but is it for insulation or aesthetics?

canadaclub 06-23-2010 03:51 PM

It was for proper bonding...solid as a rock...literally

rtoni 06-23-2010 05:00 PM

Quote:

Originally Posted by canadaclub (Post 460385)
That's exactly what is is...gypsum board (aka gyproc). Very heavy which is why, if you notice, the sheets are smaller than 4x8. It was the 'drywall' of the sixties. Chances are, if you tear a wall down, you will also notice metal mesh in the corners. You have to cut all around the ceiling with a sawzall to get a straight cut.

I reno'd my house years ago with the same stuff and when I ripped the walls apart I found that the contractors disposed of all the scrap inside the walls:furious: Every single wall had scrap in the cavities almost up to the ceiling! I had to double the size of the disposal bin I had ordered.

that's my place - the long skinny sheets hung horizontally, mesh in the corners, plaster coat on top. I think I once heard somebody refer to it as gypsum lathe? is that correct? The plaster guy was very good - it's still in great shape today (did not gut it all). I did not find too much junk in the walls that I did open up but I did find that, apparently, pounding about 300 4" nails thru a 10 foot length of bottom plate was somehow supposed to compensate for the wall being about 5 deg out of square, or an inch out of plumb... :(

tripower 06-23-2010 07:55 PM

My walls look nice as well but hanging pictures can be a pain.


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