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Weekend Hillbilly
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# Posted: 29 Dec 2013 03:30pm
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We are looking at installing a wood stove in our cabin. We are considering both options of venting the stove. First, running the stove vent pipe vertical, directly through the roof. Second, out the side wall and then vertical through the roof overhang.
Either option requires running the stove pipe through the roof. I have looked on YouTube and see directions of the correct installation and flashing of a stove pipe through a shingled roof. I cannot find directions on how to correctly install and flash a stove pipe through a metal roof. Any advice and direction would be appreciated.
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Nirky
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# Posted: 29 Dec 2013 03:55pm
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On mine:
Single wall 6" pipe from stove up through square black metal square box which is nailed to ceiling studs.
From there, 8" triple wall pipe up through roof cavity into another metal box, galvanized. About 12" square and 18" tall, where the box meets roof I cut box to match angle of roof.
Cut out 12" square of roofing, galvanized box goes through hole, bend out approx 1" 90 degree tabs which come through square hole in roof. Used roofing screws to attach galv box to roof, screw in from up top.
Covered hole with adequate flexible-base flashing vent which has round rubber seal which goes around 8" pipe snugly.
Used ample silicon sealant where vent & metal roof meet, underneath flexible flashing base. Used roof screws about every inch, didn't skimp.
If worried abt winds can strap top of chimney with metal straps. If get lots of snow you can buy a divertor which channels snow around chimney.
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OwenChristensen
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# Posted: 29 Dec 2013 05:23pm - Edited by: OwenChristensen
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I use the Selkirk system from Menards. I like to use a cathedral support for either a vaulted ceiling or flat. If the chimney is close to an outside eave wall, I cut the top to match the roof slope. Ideally you leave a couple inches of the support box below the ceiling. Then the insulated pipe will set in that. A roof flashing slides over that and sets on top of a couple rows of shingles, and all the other rows above halfway on the flashing go on top of the flashing. If done right, no tar is needed. You might use four or five metal roofing screws on the lower flashing edge to hold it down. The top edge will be held with the shingle nails. a small collar is available to clamp onto the chimney that sets on the top of the flashing, a little silicone caulk on that will keep rain drops from following down the edge of the chimney, then a rain cap on top.
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Weekend Hillbilly
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# Posted: 29 Dec 2013 06:55pm
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I should have added that the roof pitch is 12 x 12. There is the added concern about the stove pipe being positioned so that yearly cleaning and maintenance is more easily accessible.
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Weekend Hillbilly
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# Posted: 29 Dec 2013 07:00pm
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I also need to add that we have a full loft above the bottom floor. If the stove pipe remains inside - we will have to run the pipe through the ceiling of the first level and then through the ceiling of the loft.
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OwenChristensen
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# Posted: 29 Dec 2013 11:38pm
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I also now see that you had mentioned both metal and shingles. You should run insulated pipe from below the loft all the way though. There are rubber boots for use on metal roofs. They cost about $150 and work well. They have a soft lead like edge and will mold to the ribs of the metal. Screw that down and caulk the top edge with a good sealant and you'll be fine.
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Nirky
Member
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# Posted: 30 Dec 2013 03:11am
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This is what Owen is talking about:
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OwenChristensen
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# Posted: 30 Dec 2013 07:27am
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Thanks , Nirky
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tcmatt
Member
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# Posted: 31 Dec 2013 09:22am
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Weekend,
Check out this thread. I jsut installed mine thru a 13/12 metal roof.
Matt
http://www.small-cabin.com/forum/6_4089_0.html
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tcmatt
Member
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# Posted: 31 Dec 2013 09:23am
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Be sure to see the youtube link in the first post by me. It really helped me out alot.
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bldginsp
Member
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# Posted: 31 Dec 2013 10:02am
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Here's a great guide to chimney installations:
http://www.efireplacestore.com/chimney-pipe-buying-guide.html
And here's the Simpson duravent installation guide with good diagrams showing the different components:
http://www.duravent.com/docs/product/DuraTech_2011cat_web.pdf
Be sure you know the difference between stove pipe and chimney pipe, and install each in their place.
Good luck
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