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Chimney thru metal roof

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by jeff_t, Feb 2, 2013.

  1. jeff_t

    jeff_t Minister of Fire

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    We bought a vacation place a few weeks ago, and I have a stove to install. Some brief searching hasn't shown me much for what to use to penetrate a metal roof. I found a silicone boot from Selkirk, but I'm not sure if that's what I need. We're taking a U-Haul full of crap in a couple of weeks, and I may be able to get the stove in, if I can gather what I need in time.

    It isn't corrugated, it looks like this. I think. I have only seen it once when it wasn't snow covered.

    metal-roof.jpg

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  2. topoftheriver

    topoftheriver Member

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    If you're not sure, it would be wise to hire a professional so you don't damage the roofing. It is tricky to get the hole in the right spot.
  3. jeff_t

    jeff_t Minister of Fire

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    I have done two installs through shingled roofs, so I'm pretty familiar with the process. I'm just not sure how to seal up the metal roofing.
  4. begreen

    begreen Mooderator Staff Member

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    velvetfoot likes this.
  5. jeff_t

    jeff_t Minister of Fire

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    Thanks.

    I can see this won't get done in an already sorta busy weekend. I think I better put it off until summer.
  6. begreen

    begreen Mooderator Staff Member

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    Good idea, this is not a job you want to rush. Most importantly, remember that water wants to run downhill. Don't impede it by creating artificial dams of silicone where it isn't needed.
  7. jeff_t

    jeff_t Minister of Fire

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    Good point. There's not much pitch to begin with.

    The previous owners left us with 68% in the 500 gal pig ;). No hurry, I guess. Probably should buy some wood, though.
  8. Leroy_B

    Leroy_B Member

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    I'm going to follow this thread closely. I also wondered about a chimney flashing for a metal roof and how the install is done without any water damming up.
  9. webby3650

    webby3650 Master of Fire

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    I know some people use the silicone flashings with success, but I often find them leaking. In addition to the risk of leaking, they offer NO support for the chimney like a metal flashing offers.
    Anytime we do a metal roof install we use this one from ICC. It offers a permanent seal, it installs similar to a shingle type flashing, by tucking under the metal on the top side.

    Here is the flashing to use: http://www.icc-rsf.com/main.php?t=chem_produits&i=95&l=en
  10. Treacherous

    Treacherous Minister of Fire

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    I have this one. No complaints here.

  11. jeff_t

    jeff_t Minister of Fire

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    Maybe we should think about tearing the brick chimney down and go thru the wall. There is a ceiling support in place from a previous metal chimney, but they covered the hole when they put the new roof on. The exit point has to be almost at the peak. I'll have get in the attic and take a look.

    The hearth that is there has a TV on it now :rolleyes:

    2013-01-19_16-11-59_811.jpg
  12. webby3650

    webby3650 Master of Fire

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    Can you re-line the chimney thats in place?
  13. begreen

    begreen Mooderator Staff Member

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    Good advice. Do you have any roof shots of an install?
  14. webby3650

    webby3650 Master of Fire

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    No, I usually take pics of the stove, but never thought to take a pic of the chimney.
    I do a few a month through metal, I'll get a pic next time.
  15. Bret Chase

    Bret Chase Minister of Fire

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    flashing a metal chimney through a metal roof (screwdown or standing seam) isn't that big of a deal... if the hole stays in the flat and doesn't go through a rib. If it's a standing seam roof is is generally better to use the silicone boot and figure out a different way to secure the top of the chimney, as a SSR is only restrained at the bottom, and grows toward the peak as it heats up. With a screwdown it is also generally easier to use the silicone boot... though I have done a couple with a shingle type boot, but it requires cutting the panel....

    if your hole transitions a seam in a SSR..... it becomes an ugly, ugly nightmare... the worst one I had to do involved 2 12" metalbestos chimneys that were less than 2' apart.... it took me almost 2 days to get it tight...
  16. charly

    charly Guest

    When I went through my corrugated metal roof, I bought a stove pipe laser level that fits inside the top of the stove pipe or your wood stove and projects a laser dot right at the center point on the roof or what ever you are going through.. Was dead nuts on..scribed a circle after marking the dot and it was dead on plumb. I wound up using the silicone boot flashing kit..So far no leaks...
  17. eclecticcottage

    eclecticcottage Minister of Fire

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    Just watching...we are thinking of doing a standing seam roof eventually, and we'll need to deal with this then.
  18. begreen

    begreen Mooderator Staff Member

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    Finally found a shot of the ICC flashing. I knew I had it sitting somewhere in my desktop junk.This is at the ridge, but the bottom detail is good. The storm collar has not been installed yet. Note that the sealant is only under the side flanges. The bottom is left unsealed for drainage.

    ICC_metal_roof_flashing.jpg
    jeff_t likes this.
  19. chimneylinerjames

    chimneylinerjames Feeling the Heat

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    I would see what it would take to line the brick chimney. If its not in use, I would try to use the chimney that's already there. Just install a liner with insulation and your set.
  20. Bret Chase

    Bret Chase Minister of Fire

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    the bottom detail isn't great.... is that a foam closure on the bottom, or was the metal cut to fit?
  21. begreen

    begreen Mooderator Staff Member

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    I think he wants to get the stove more centrally located with a taller, straight up flue. The brick chimney is pretty short. Add a couple 90º turns in the smoke path and it is going to draw poorly.
  22. webby3650

    webby3650 Master of Fire

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    It's cut to fit. I seal the bottom edge though. The customer can see daylight and they don't like it.
    And I don't think there would really be any drainage allowed due to the size of the hole only inches away from the tail of the flashing. On a shingles roof it makes good sense, but here, I would rather seal it.
  23. Bret Chase

    Bret Chase Minister of Fire

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    I seal it when I install them in a metal roof... I don't care what the customer "wants"... They never seem to like the "I told you so..." I don't want the callback for the chimney leaking due to wind driven rain, or the ice damn that *always* happens just down hill of the chimney...
  24. charly

    charly Guest

    That's great if you can tuck the top under the ridge cap,, but that not always the case.
  25. Lumber-Jack

    Lumber-Jack Minister of Fire

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    My roof install was very much like this except the chimney came out a little lower down from the ridge cap. All you have to do is cut another piece of the same type of metal roofing and install it so the lower part over-laps the chimney flashing and the top goes under the ridge. Done!
    charly likes this.

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