I burn coal in a modified barrel stove and ran a class A metalbestos stove pipe through the roof. I would avoid elbows as coal stoves run lower stack temperatures than woodstoves and are more sensitive to low draft conditions. Check out this forumhttp://www.nepadigital.com/bb/index.php it...
It depends on the type of metal roof you have. On my garage I have the metal type that has 4 small ridges and the large flat valleys. For this type get yourself a roof jack, several of the foam strips with the metal roof profile cut into them, and a couple tubes of butyl sealant.
Lay the...