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Thread: Sealing the stack

  1. #1
    Join Date
    Mar 2011
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    Haverhill, Ma
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    Default Sealing the stack

    I kind of hacked out a rough circle in my metal roof for the stack so there are gaps around the stack that I would like to seal to prevent snowmelt/water from leaking down the stack. Does anyone have any ideas about what to use? I tried furnace cement but it turned out to be water soluable. The roof is somewhat corrugated so regular flashing will not work.
    2019 - New 12X12 boiling pavilion
    2018 - New Mason 2X3 Hobby XL and homemade RO
    2017 - 49 taps on gravity, 6 on buckets.
    2016 - 19 taps on new 3/16 tubing, 24 on buckets
    2015 - 51 taps, 26 buckets
    2014 - 50 taps, 14 buckets, steel railroad toolbox converted into arch, new 2X3 continuous flow Phaneuf from Homestead Maple
    2013 - 33 taps, 12 buckets, steel railroad toolbox converted into arch, steam table pans
    2012 - 26 taps, 10 buckets, steel railroad toolbox converted into arch, steam table pans

  2. #2
    Join Date
    Feb 2013
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    central NH
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    Default

    We use copper based RTV. Has a 1200 degree melting point.
    Steve

    2017
    2x8 Mason drop tube evaporator
    420 Taps
    3 surflo pumps on 5/16
    79 gallons of syrup made
    2016
    New kitchen addition to sap house
    400 taps
    52 gallons syrup made

  3. #3
    Join Date
    May 2010
    Location
    Savoy, MA
    Posts
    301

    Default

    Quote Originally Posted by eustis22 View Post
    I kind of hacked out a rough circle in my metal roof for the stack so there are gaps around the stack that I would like to seal to prevent snowmelt/water from leaking down the stack. Does anyone have any ideas about what to use? I tried furnace cement but it turned out to be water soluable. The roof is somewhat corrugated so regular flashing will not work.
    Did you put your chimney up through the metal roof and then into flashing? Or did you just go up through the metal roof into blue sky? If the latter, I would use something like this:

    https://www.fastenersplus.com/6-Roof...SABEgKB5PD_BwE

    I am going to be going through a corrugated metal roof in a new barn a built and am going to try just this product. The base is malleable and conforms to the profile of your corrugated roof.
    16x24 Timber Frame Sugar House
    Mason 2x4 Evaporator
    90 trees on buckets

    "Roses are red and violets are purple
    Sugar is sweet and so is maple surple
    "

  4. #4
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    central NH
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    Quote Originally Posted by bigschuss View Post
    Did you put your chimney up through the metal roof and then into flashing? Or did you just go up through the metal roof into blue sky? If the latter, I would use something like this:

    https://www.fastenersplus.com/6-Roof...SABEgKB5PD_BwE

    I am going to be going through a corrugated metal roof in a new barn a built and am going to try just this product. The base is malleable and conforms to the profile of your corrugated roof.
    Yes we went through a corrugated metal roof. But had a stainless roof jack and rain collar. Sealed the collar with the RTV copper. I looked at the specs on this jack you put the link up for. Is 500 degree going to cut it? The max temp is only rated for 500f
    Steve

    2017
    2x8 Mason drop tube evaporator
    420 Taps
    3 surflo pumps on 5/16
    79 gallons of syrup made
    2016
    New kitchen addition to sap house
    400 taps
    52 gallons syrup made

  5. #5
    Join Date
    Feb 2013
    Location
    central NH
    Posts
    164

    Default

    I know Bascoms has already made stainless roof jacks available. For under $300
    Steve

    2017
    2x8 Mason drop tube evaporator
    420 Taps
    3 surflo pumps on 5/16
    79 gallons of syrup made
    2016
    New kitchen addition to sap house
    400 taps
    52 gallons syrup made

  6. #6
    Join Date
    May 2010
    Location
    Savoy, MA
    Posts
    301

    Default

    Quote Originally Posted by whity View Post
    Yes we went through a corrugated metal roof. But had a stainless roof jack and rain collar. Sealed the collar with the RTV copper. I looked at the specs on this jack you put the link up for. Is 500 degree going to cut it? The max temp is only rated for 500f
    I did a quick search for that link yesterday. If you look around you'll see other variations and other companies with different temp ratings. Some have a round base and others a square base. 500F might be the upper limit though on these silicone roof flashing products.
    16x24 Timber Frame Sugar House
    Mason 2x4 Evaporator
    90 trees on buckets

    "Roses are red and violets are purple
    Sugar is sweet and so is maple surple
    "

  7. #7
    Join Date
    Feb 2013
    Location
    central NH
    Posts
    164

    Default

    My 2 cents is Invest in the good roof jack. $300 in cheaper then loosing your sugar shack.
    Steve

    2017
    2x8 Mason drop tube evaporator
    420 Taps
    3 surflo pumps on 5/16
    79 gallons of syrup made
    2016
    New kitchen addition to sap house
    400 taps
    52 gallons syrup made

  8. #8
    Join Date
    Jan 2017
    Location
    Williston, VT
    Posts
    71

    Default

    I don't worry about the slight gap. Rain and snow are a minimum. It melts and dries just like steam condensate.
    Ken & Sherry
    Williston, VT

    2017 - 13 gallons on 65 taps (12 buckets, rest 3/16), 2x4 flat bottom, modified cargo box sugarhouse
    2018 - 90 gallons on 418 taps (gravity lines), Leader 30"x10' Vortex Arch & Max Raised Flue with Rev Syrup Pan, New Sugarhouse
    2019 - Burned through alot more money: heated kitchen, 2x2,000 and 375 gal ss sap tanks, CDL1200 RO, Bauch Vac Pump, More taps, etc., etc., etc.
    https://www.facebook.com/pumpkinhillmaple/

  9. #9
    Join Date
    Mar 2011
    Location
    Haverhill, Ma
    Posts
    711

    Default

    >Or did you just go up through the metal roof into blue sky?

    Into the wild blue yonder. My concern is the facilitating of rust on the stack.

    >Copper RTV

    I was wondering if something like JB Weld would be applicable. I think I've had readings of 700 degrees on my stack at times.

    Thanks for the quick responses.
    2019 - New 12X12 boiling pavilion
    2018 - New Mason 2X3 Hobby XL and homemade RO
    2017 - 49 taps on gravity, 6 on buckets.
    2016 - 19 taps on new 3/16 tubing, 24 on buckets
    2015 - 51 taps, 26 buckets
    2014 - 50 taps, 14 buckets, steel railroad toolbox converted into arch, new 2X3 continuous flow Phaneuf from Homestead Maple
    2013 - 33 taps, 12 buckets, steel railroad toolbox converted into arch, steam table pans
    2012 - 26 taps, 10 buckets, steel railroad toolbox converted into arch, steam table pans

  10. #10
    Join Date
    Feb 2013
    Location
    central NH
    Posts
    164

    Default

    Quote Originally Posted by eustis22 View Post
    >Or did you just go up through the metal roof into blue sky?

    Into the wild blue yonder. My concern is the facilitating of rust on the stack.
    Are you using mild steel stack or stainless. Painted steel will rust once the heat gets to it and moisture sets on it.

    >Copper RTV

    I was wondering if something like JB Weld would be applicable. I think I've had readings of 700 degrees on my stack at times.



    Thanks for the quick responses.
    I don't know what the melting point is of JB Weld. If you can get a rain collar on and seal it with high temp silicone would be your best bet.
    Steve

    2017
    2x8 Mason drop tube evaporator
    420 Taps
    3 surflo pumps on 5/16
    79 gallons of syrup made
    2016
    New kitchen addition to sap house
    400 taps
    52 gallons syrup made

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