I will be installing a woodstove chimney in my garage in August and was concerned with one part. When I cut the hole for the chimney and have to overlap the metal over the boot will I have to purchase another piece of metal being that the roof has one piece metal roofing from the bottom of the roof to the peak?
I would like the project to look professional with no signs that a rookie installed it. If I cut the metal roof that is in place know will it be to short to over lap at the chimney?
If you haven't purchased your chimney and stove pipe yet check out these guys. They had the best pricing that I could find when I put in an 8" chimney for the wood stove in my pole barn. I will be giving them a call when I reroof my camp. I am waiting for cooler weather to tackle that job. http://www.hearthsidedistributors.com/
I'm sure that boot would work fine for a vent pipe but on a chimney I have my doubts. It wont fit between the ribs like shown in the picture so your going to do some extra bending and leave potential for leaks. I decided to go through the wall at camp after looking at some of those boots. I went with metal so I won't ever have to get back up there again. Plus I like a good snow slide....
I had a boot made by oatey installed on my new construction metal roof over a year ago...no problems....this is the best way to go. I have the same ridiges on my roof as well.
If you go to a local retailer for wood stoves he should be able to get you a metal based rubber boot that is made for stove pipe that is designed to be molded over each rib. It isn't cheap I don't remember the exact price, but $125.00 is stuck in my head. The one I used at camp was installed after the roof was done like the situation you describe. I used a double backed rubber adhesive membrane between it and the roof then secured it with deck screws every three inches. I then sealed over the edges and the screw heads with that black plastic roof sealant. If I had my druthers I would have preferred to lap it from the top down over the flashing with the metal roofing like you suggested, but the roof was already completed before I installed the stove. It has been nine years now with no leaks (knock on wood). I do take a look at the black plastic roof sealant once a year and re-apply if and where it is necessary.
Don't use tar (plastic cement, or black stuff) on your metal roof.
Tar isn't for metal roofs, at all, ever, it will just crack and leak again in a year or 2.
Use a good quality silicone caulk or better yet a urethane caulk.
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