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Plastering the Walls with Three Coatings

Bob talks with Gary Annino of Boro Plastering about the traditional three-coat plaster job they are doing on the brick walls of the Manhattan Brownstone. Annino explains that a drywall installtion would be too thick and would make the walls proud of the original ceiling cornice discovered in the apartment. Plaster allows them to build up the wall to the cornice and blend the wall into it. The crew first applied a blue bonding agent to the dry brick walls. Where edges and corners were rebuilt, Boro used wire mesh for keying in the plaster and a metal bead to form the smooth edge. The three-coat plaster job builds to a 7/8-inch thick wall. They begin with a scratch coat of three parts sand and one part gypsum plaster. It goes on thick and is scratched to provide a good keying surface for the next coat. The brown coat is troweled on but left smooth, since there is enough sand in it to keep the finish somewhat rough for the finish coat. The white or finish coat goes last and gives a durable shiny finish to the wall. Annino estimates that it will be dry by the next day.
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Plastering the Walls with Three Coatings

  computer-generated transcript - may not be 100% accurate

" Right now let's interrupt Gary any. And in order for borrow plastering -- right before -- believe we're really a very traditional plaster. Out here and we're on any brick party walked right so why couldn't I just happened to walk up. Well what will happen is basically where are going back personal way north of went into the existing molding you have yet if we put up regular wallboard you're gonna be proud. Of the moldings look through them. Be proud of them and that means you're gonna be starting out farther out exactly exactly so the only way to come up there'd still be flush. Is to do traditional class or. So it was so he's covering up. Here but what's the blue stuff that's done basically that's -- motor bonding agent that ensures a better bond. With a brick direct and so that is a synthetic right basically it's an. So yes you can well wallpaper right. The variety of different brands but this basically very -- your best and on the marketed we -- Thorn electrical realize you know but anyway that's the key things are getting good fund. Between. The folds correct and it's been apparent -- all right out there yeah. It went down that's good right not as good reviews the work where underground where we just for -- here just out there. And then it's a three coat plaster jobs -- when that first coat basically scratch coat. What you call the scratch easily -- that are you can see over here. After we scratch. It a little bit. The crews -- their key which is a better bond for the fact that he felt his coat. But walking hand sewn -- were building up to approximately seven eighths of marriage yet which is the right way and vertical laps what's the actual plaster that's that what -- thought originally plus that we. -- And basically see what's your product if you keep products gypsum plaster when it. And it's very strong very hard hits thirties when you get back with this stuff really fighting him. Tractor salesman and right. What's what's the ratio in a mix basically -- put we don't want. And Dolly Parton fan back -- we -- better yet but the clump. He has to do it little by little not to get -- letter yes correct. All right so let's watch him finishing. Here. This first -- Gary how long will this. How much grace period do you have -- it's. Harden up in ten or base for -- all you have much more harm America we canoes were hardest to reform based on humidity like a three day or not -- right now we're working. In the middle of September training at all what's going to be hopefully dry for tomorrow you know. Now Gary why they bring the scratch coat all the way to the edge of the bead fishermen because we allow for the brown coat of -- salvage sincerely opposite side here. And then we basically not -- the judge to allow for the white coat. Basically fighting it and this is already mentioned you've already gonna -- in exactly."

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