" Now we're gonna learn all about standing seam copper roofing with Bob Fulmer from Harraseeket roofing and welcomed -- Medford. You're you're down from Maine and get them correct that now this is I'm told the oldest type of roofing. In in the world that right. Yes it's it dates back numbers centuries. The oldest form of copper roofing is double lock standing seam. For the oldest example in the US is on Christ church in Philadelphia Christ church in Philadelphia but of course those of us and our viewers who have been to Europe know that it's also product has been used for centuries there yeah now what -- what what do you start with before you put the beautiful shiny copper. We have a plywood deck. And we've got a layer of bituthane. That's correct. Moisture resistance. And then what. And then -- that we have is our resident non slip sheet resin paper slip sheet. Why do you need that why aren't you just put the copper directly on the plywood or directly on the itself. 11 there's two considerations here one is that there's a certain amount of condensation that's generated. On the backside. The panels. -- Thermal exchanges throughout the day the the resin paper slip sheet. Helps absorb that condensation. What -- portly and in the case. Any asphalt based underlayment or bituthane. It insulates the copper from actually touching that. The slip does yes -- if you had interaction between copper and the asphalt what would happen well a little -- water arms standing water on an asphalt product creates a diluted form of sulfuric acid in the assault states -- what degrades them. -- Here you see how they will -- interlock. So you put the clips down on the next side before you do any crimping. It. -- Now what's this tool called a seamer. What what does she was doing here Bob it's a double lock standing seam with the true that two step process. This first process is locking. The male over top of the female -- Finishes the first -- The second seamer that now comes along. And finish the second lock of the double lock process. In the material will have one profile an inch high. And double locked at the top. -- to take care of that and exactly there you go see how it's rolled over there. And that is a standing -- yes. Finished double -- and things. And of course you can do this in plain copper what grade copper are we using here -- you're seeing on sixteen were copper is. Normally -- sold. What an ounce are pleading and what that means it is sixteen ounce refers to one square foot of this copper weighs sixteen weighs sixteen ounces right yes. Now Bob what's the life expectancy of -- copper roof like this. A sixteen ounce standing seam copper roof in this application in every five years would be relentless and expectation. Now that gets bent down just with a hand -- yes that's correct. He's been around that liquid drip edge was flawed. All right now in this. Clutter of tools here we have what's known as the valley. Where two slopes of a roof -- how do you deal with the copper there. Well again Bob it's critical to all lock the copper panels. And in order to do that we actually bend. A lock it and it's it's all a single piece of copper and we actually bend the lock on the break right in through that piece and that enables us to lock our panels into the -- It's built. Now another important part of the installation is what kind of fasteners used it and -- it. These are a number ten Warner copper Slater's nails. If you used another metal what would happen. Electoral system would set up dissimilar metals we're working with a -- to. Have to keep within the copper genre or brass."