How to eliminate gaps between the chimney and slate

Surely, many owners of houses with stove heating are faced with such a problem as rainwater leaking along the outer walls of a brick pipe, through the roof and attic, to the ceiling of the house.

Especially in heavy rain. No matter how tightly you fit the sheets of metal to the pipe, water still oozes out. And it’s very unsafe not to foam such a gap with ordinary mounting foam, even with a thick brick pipe. But I haven’t seen or found any fireproof foam in stores, no matter how much I searched... and it’s not known whether such a thing even exists in nature!

After thinking a little, remembering all the non-flammable materials in my memory, I opted for asbestos fabric and heat-resistant cement-based tile adhesive. Asbestos fabric does not burn, fungus and mold do not stick to it, it is not subject to rotting... In general, I did not find any disadvantages of asbestos fabric, specifically for this purpose. And heat-resistant tile adhesive, unlike pure cement, will not crack and crumble due to temperature changes and weather conditions.

Will need

  • Rough and thick asbestos fabric (this is usually used in gas-electric welding work as protection against sparks).
  • Scissors.
  • Cement-based tile adhesive (1 two-kilogram bag).
  • Water.
  • Bucket for solution.

We eliminate the gap with our own hands

First, let's prepare a solution in a bucket. Pour a kilogram of glue (half a packet) into a bucket and dilute it with water until smooth. The solution must be liquid. The consistency is approximately like kefir, something like that.

In general, the solution must be able to saturate the asbestos fabric immersed in it. If you overfilled the water and the solution turned out to be too liquid, add more glue. And under no circumstances add sand! Not a gram! Otherwise, the frozen solution will be washed away by rain. A clean cement-adhesive mortar, after final hardening, will be smooth and glossy, and therefore will be less susceptible to the effects of flowing water and the environment in general. Now we need to get all this stuff onto the roof. Don't forget the bag of dry glue - we'll need it later. We will cut the asbestos fabric immediately on the spot so as not to miss the size of the required pieces. So, after inspecting the place where the pieces of asbestos fabric soaked in the solution will be placed, we cut this fabric into pieces of the required size. I cut rectangles in such a way that I could then fold the soaked fabric in half. Now we lower the fabric into the liquid solution and carefully press it there so that the solution saturates it properly.

We take the fabric out of the solution and, if the gaps between the pipe and the roof are wide enough (like mine - from a centimeter to two!), fold it in half, since the additional thickness will prevent it from falling through or sliding into the gap into the attic (liquid glue quite slippery!).

Cover the gap with this soaked cloth. Next, we repeat all the above procedures with the fabric and solution until we close all the large cracks and gaps, after which you can peel off and rest for 30-40 minutes until the soaked fabric sets at least a little and becomes harder.

After the break, we climb back onto the roof, check that everything is in order, so that nothing has fallen in anywhere, and dilute the solution of glue and water thicker than it was before, so that it can thoroughly seal up all the remaining small cracks, as well as smooth out small ones and large irregularities.

By the next morning, the solution, with asbestos fabric embedded in it, will completely petrify. The main thing is that it doesn’t rain during hardening. So don’t be lazy to look on the Internet and find out about the weather in advance, so that all this hard work is not done in vain.

Eventually; the result is a fairly strong and dense belt around the pipe, which will not let rain water into the attic - such cement-based glue tends to shrink when hardening, which leaves almost no chance for water.

And the grooves, which I specially made with my hand, will not be superfluous, for better water drainage. Thus, with the help of asbestos fabric and cement-based tile adhesive, we saved ourselves from the problem of a damp ceiling around the chimney during heavy rain, as well as during long autumn rains.

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Comments (35)
  1. Shurik
    #1 Shurik Guests 20 September 2018 19:02
    1
    Yeah, slate is the past, now it’s corrugated board
    1. Owl
      #2 Owl Guests September 25, 2018 09:09
      15
      Slate is the future, not the past. In addition, “corrugated sheeting” as you put it, i.e. profiled flooring is also slate! Perhaps you meant metal profile? I'm thinking of replacing this shit with slate, it's not durable, it's noisy, you can't step on it, etc., etc., etc.... I often see how they are already starting to remove the metal profile and cover it with slate. So....
      1. Guest Alexander
        #3 Guest Alexander Guests 25 September 2018 17:27
        6
        I have the same opinion, slate rules.
      2. Guest Andrey
        #4 Guest Andrey Guests September 28, 2018 07:56
        5
        This is how slate is called a natural or artificial layered material, from the German word Schiefer - slate. And corrugated sheeting is a profiled material made of metal using the cold rolling method; it can have a wave-like shape similar to traditional slate, which, however, does not make it slate.
        As for replacing corrugated sheeting with slate, it is only a violation of technology; on the right roof, corrugated sheeting will serve for a very, very long time.
      3. Guest Vladimir
        #5 Guest Vladimir Guests 5 October 2018 23:44
        3
        I use slate (I forgot the corrugated asbestos-cement sheets GOST) nowadays. This material i.e. asbestos is concierge, so they try to use it less often in private housing.And the collar is easily made from bitumen tape; its width can be 100 mm or more. You glue it, but then tear it off with the slate.
  2. Pruvet
    #6 Pruvet Guests 20 September 2018 20:03
    12
    And from the side of the ridge, when the water runs merrily across the slate, under a sheet of miracle putty and through the pipe into the house? Can I take a photo to the studio?
    1. Vadimovich
      #7 Vadimovich Guests 25 September 2018 08:46
      0
      There the water runs from the top leaf into the downpour. All you have to do is tear everything off and carefully pin everything back together. Time gradually spoils everything.
  3. Guest Roman
    #8 Guest Roman Guests 20 September 2018 21:43
    19
    Tear off the iron, straighten it and nail it again. Close to the pipe, under the bottom edge of the otter. And no fabric or tile adhesive. In general, judging by the photo, it’s time to reposition the pipe.
    1. Yuri
      #9 Yuri Guests 21 September 2018 20:08
      2
      You are absolutely right, under the snow load the roof will sag and water will run under the putty from the ridge even more than before
  4. Valery
    #10 Valery Guests 20 September 2018 22:59
    4
    There is fire-resistant polyurethane foam.
  5. ask
    #11 ask Guests September 21, 2018 08:14
    6
    There is also a heat-resistant sealant with temperatures up to 1500 degrees and costs 350 rubles. Sold almost everywhere.
    1. Guest Nikolay
      #12 Guest Nikolay Guests 25 September 2018 05:45
      0
      I tried heat-resistant sealant with temperatures up to 1500 degrees, both in the bathhouse and on the house, but it still cracks from external influences of temperature and moisture.. Money down the drain..
  6. Sanych
    #13 Sanych Guests 21 September 2018 14:11
    2
    IT IS NOT DESTINY TO INSTALL A METAL PIPE
    1. Guest Sergey
      #14 Guest Sergey Guests 21 September 2018 14:59
      6
      With a metal pipe there is an order of magnitude more hassle.
  7. Guest Alex
    #15 Guest Alex Guests 21 September 2018 20:15
    4
    If the sheet of iron from the ridge and into the pipe rests with its curved edge, then it will no longer flow over the slate.
  8. Kamil RB.
    #16 Kamil RB. Guests 21 September 2018 21:24
    4
    Do not under any circumstances follow this advice regarding the use of asbestos. You can learn about the dangers of asbestos on the internet yourself.
    1. Sergey K
      #17 Sergey K Visitors September 24, 2018 00:29
      4
      If you follow your advice, then you won’t be able to live at all... The slate itself also seems to contain asbestos, fences are often made from slabs containing asbestos, and they are used in many places.

      The most important thing is that it is not in the living room!
      1. Alexander Onuchin
        #18 Alexander Onuchin Guests 25 September 2018 17:47
        3
        You are categorically right about the harmfulness of slate and the impossibility of using it in residential premises, but only for imported slate brought from America, Latin America, Canada, etc. But our slate does not have a needle-like structure, so it is harmful when treated to remove dust, which By the way, then it still comes out of the lungs. But we wear respirators, etc. And when in the house, there is much less harm from it than from OSB, laminate, chipboard, etc. such a modern material. You need to measure the radiation when you want to use slate, you can really run into this, albeit with cement, brick, etc. this happens. But it’s not from the material, but from the soil where the ore is taken...
        1. Guest Vasily
          #19 Guest Vasily Guests 29 September 2018 21:08
          0
          That's right: asbestos mined in Russia has a different chemical composition, unlike imported ones, and the harm from them is only like dust, once in the lungs it is eliminated within days. While imported asbestos has a different chemical composition and is not excreted from the body, therefore it is dangerous and prohibited. And I lined my asbestos-cement pipe at the dacha with a metal sheet and coated it with a cement-sand mortar, one to three. It lasted a quarter of a century until it was necessary to change the slate: it did not leak or crack. True, for strength I added asbestos fiber to the solution.
    2. Guest Nikolay
      #20 Guest Nikolay Guests 25 September 2018 05:47
      5
      Yeah... Asbestos on a pipe is very dangerous)) Made me laugh!
    3. Alexander Onuchin
      #21 Alexander Onuchin Guests 25 September 2018 17:39
      0
      And what harm? And what asbestos? Where are the arguments? link to the studio. Just don’t talk about the needle-like structure of this material... In Soviet times, all pipes were rolled using this technology...
      In this unit, the proposed option is a real alternative to other sealing methods. But this composition will still crack over time. the coefficient of linear and expansion of the contacting materials is different, which means that cracks will appear somewhere due to temperature expansion. Then water, then ice and the crack gets bigger and bigger. Look at the brick, how its life in such conditions is finished... The reason is tritely simple - the brick is simple rubble, but you need to use another one. And they correctly wrote the protrusion at the top and the metal closely through a temperature-resistant material, for example, a strip of fluoroplastic.
  9. Guest Mikhail
    #22 Guest Mikhail Guests 22 September 2018 17:22
    2
    I stupidly filled it with heat-resistant sealant and that’s it, although I laid down the mesh so that it wouldn’t leak, the roof is profiled, the iron pipe is high, when I installed it I realized that the corrugation couldn’t be put on, so I chose the sealants, nothing leaks and the seam is not visible, the profile is cherry and the sealant is red
  10. Guest Dmitry
    #23 Guest Dmitry Guests September 23, 2018 01:02
    1
    The sealant (which is heat resistant) does not work outdoors. He's just you-we-va-et-sya. Moreover, it also provides a rigid connection.
    We have already written about roof subsidence.
    I think that in this case the best option is to re-lay the pipe.
    Moreover, the bricks should not just stick out of it))), but parallel to the roof. And metal sheets with a bend are brought into the gap.
    *And how did people live without our technologies before? ))