Cutting flat on the saw base is the only way to do giant pieces of exterior crown. The only way I've been able to set the saw accurately is by trial and error with some scrap, the circle and triangle marks on the saw are just a starting point. I like to cope by scanning the extra away with the table saw if the piece is short enough, it makes a knife edge that sits really tight.
Hi all. Lead chimney caps are a mideval thing. Lead is easier to work with than copper because it doesn't work harden and creases can be shrunken out easily with light blows.
To parge the crown I used water putty because it cures really hard in about 10 minutes. I can make several coats in one sitting.
I use a siloxane sealer, even though it means you can't repoint the mortar or anything for probably five years, because nothing sticks to silicone. I figure it won't need repointing until the siloxane wears off anyway.
I hope that helps.
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