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Adding Detail to the Plaster Cornice
computer-generated transcript - may not be 100% accurate
" -Now that's the scratch coat that we put up two weeks ago right?"
" -That's right."
" -We've got the scratch coat up and we've got the brown coat run and we're ready, we got a track set, we're ready to run the run the white coat."
" -We're gonna pull the rest of the corners work by hand, right?"
" -That's right. We've got a mold set up and we're gonna pull it, the profile of the corners."
" -Hi, Ralph."
" -Hi, Bob. Can we take a look up there?"
" -Certainly."
" -Now, this is not the kind of job that you're gonna attempt with a dry wall joint compound."
" -No, Bob. It really takes a special mix as you can see,"
" -Ralph is taking a lime, which is a lime putty that's been mixed with water and slake and he is filling it up as much water as he can hold between it."
" -And then, what's being added now?"
" -Now, he is adding gauging plaster and it takes 3 mixes, 3 parts for the mix. This is gauging and then they'll add molding plaster. "
" -And what are the differences between gauging and molding plasters."
" -Molding plasters sets up very quickly and it allows you to put plaster up and run it and have it set but,"
" -by itself it would set too, too quickly, so the gauging will help retard the set and the lime will help it give it some bulk filler."
" -Okay and we're restoring a running length of the corners that's about maybe 6 or 8 feet."
" -Right."
" -This is a small batch, why is that?"
" -Well, you can only run so much at a time. This will work for 5, maybe 10 minutes at the most and then it will be too hard to work with."
" -Oh boy, so that's a very, very span of time."
" -Right. You got to be quick. Once they'll get this mixed up, all thoroughly mixed then they've got to get it up on the wall and pull the forms."
" -Ralph, that's the best way to mix it, so as you don't get bumps and stuff in it."
" -Well, yeah because you, you get dry spots in it if you try to mix it in a bucket usually."
" -Aha."
" -In this way, you can work it in and you can adjust the amount of water you use so the thickness or you know you have a certain amount of control over it."
" -What, how many parts for each?"
" -Ah, this is a 5 parts lime to 4 parts of molding and 2 parts of gauging."
" -Okay. So you don't overload the hut and you spray some water on the, on the scratch coat before you approach it."
" -And the water will help it, so it doesn't set too fast."
" -Can you just do 3 or 4 feet at a time or can you do a"
" -That's all you can do. You really can't do too much at a time just because of the nature of the material. It's as much as you can spread and then pull."
" -Gee Ralph, that's really something. It looks like a 10 year old did it."
" -I'm loading up the wall"
" -and Jack will pull the [unk] in a moment."
" -Yeah. Pulling it is the secret because you end up with a very, very fine layer of plaster. Let's look at that. Moby, did you make this up?"
" -Yeah. Well, actually we've made a wooden form and then cut a metal profile of the cornice and it's got a handle on it, so, it'll, you can hold it comfortably and run it in on a wooden track."
" -So, you've copied the existing cornice. "
" -Right."
" -Okay."
" -Jack will wet it and go ahead and start to run it now and see how it works."
" -Knock yourself."
" -Yeah."
" -Now you can see, it's not perfect the first run. So, what they're gonna do is run it a couple more times and they'll add some more mud where they need it."
" -Where there's a void."
" -Where there's a void and gradually it will build up with the profile that we want."
" -Alright. We've have about a half an hour elapsed in real time and this is the third pull with that profile screen and you can hear the plaster, it really has dried up."
" -This is a lime slurry I'm adding to fill in any air bubbles or imperfections in the pull."
" -The original cornice and frieze is highly decorated in this house. There is a row of small {unk] sleeves here. There's larger [unk] sleeves over here and this is the part that we're reconstructing. Underneath every couple of feet or so, is an element called a triglyph which comes from Greek temples. Down below there is a frieze that's decorated with these horns of plenty. Spilling out with fruits, [unk] and rice and it is a complicated restoration project you've got here."
" -Right now, you're ready to put up, what? The, the big"
" -The larger [unk] sleeves have been already marked out where they're going to go and"
" -You've made about a hundred of this haven't you?"
" -Yes with a rubber mold. I think you saw that already."
" -Right and how, how do you put them on, with glue or something?"
" -I use a plaster of Paris to attach this. It just takes a little bit on the back of each one."
" -So, the plaster of Paris is the faster setting plaster, right?"
" -Yeah. It is very fast setting and it just takes a little dot and we set it and hold it for a few seconds and it will be there permanently."
" -Okay. Here's another one. It's a little bit like decorating a cake. Isn't it. This is a replica of a triglyph."
" -Right."
" -And you have to hold that or should I put it out here?"
" -[unk] just put it a small thin even coat."
" -There you go, cream cheese."
" -And we have that marked off like those right there."
" -Just like his days of old."
" -Hold it for just a couple of minutes and it will be set."