Quote:
Originally Posted by bluecuracao
Okay, that's the problem--you're worried about the way it's going to look, which I can understand in your line of work. In the case of a roof, it has to be very functional and long-wearing, i.e. tight and sealed.
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A long piece of roll roofing is not like fabric, it's like a wide, thin board. It can roll and flex, and it can twist, but it can't change it's rectangular shape, unless it's very, very hot. Rolled out flat, it has to be straight... like the edge of the roof. The only way you can make it crooked, is to cut it up in a bunch of short pieces.
If the top layer (straight), and the bottom layer (not straight), don't match, being cemented it will seal out wind driven water and ice damns. But it will make a weaker edge that will deteriorate much faster.
The edges can be made to match, using care, with either method. But using a single piece is faster and easier.