![]() ![]() ![]() REad those then tell us what you indeed have and ask questions where this is unclear. There are many posts in this forum about patching drywall. Treat the joint as an ordinary drywall joint or better yet as a ******* joint where the tapered edge of new drywall meets the non tapered butt end or cut side of a piece of wall board because with the additional thickness of the veneer plaster you will have that kind of offset. Now, having said all this I think a more amateur friendly way of doing this is to use conventional drywall finishing methods. if you lap some plaster onto the existing clean it with the edge of your trowel. You do not want to lap your plaster onto the existing finished wall. If you have a two coat system youcan do it that way or you can use a one coat material and just put it on in two passes. Then plaster the new board including the joint over to the existing wall you want to match. I have not used FibaFuse for this kind of application but hai think this is what I would try. What you want to do is scrape enough of the plaster, i think about 6” wide that you can tape the joint of the new and existing veneer plaster base board with joint tape. ![]() If you gouge the paper a little do not worry. Try to get Dow to the paper of the board. Scrape the plaster only from your veneer plaster base board. it might be so difficult that you cannot do it. What I am about to tell you will probably not be easy. If you can’t get the blue board conventional drywall will work. To repair the first system I described I suggest you do it with the same system if you can get the blue board. The gypsum lath is 3/8” thick and the plaster brown coat is about 3/8” - 1/2” and the finish is 1/16” - 1/8”. Maybe what you have is gypsum lath with gypsum plaster, a superior plaster system. In a two coat system the first coat is a (usually) sanded plaster with a (usually) smooth plaster finish. Your coating could be a one coat system or a two coat system. it is blue to distinguish it from other gypsum boards. It is much like conventional drywall only has a different kind of paper finish so that plaster bonds to it. A couple pictures of what you have including a picture of the cross section of the wall material in question would help. ![]()
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