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I am living in a multi-family house which happens to be an old building. The person living under my room is a chain smoker. Unfortunately, the smoke is smellable in my room, even if I close the window and the doors. The only direct connection beween our flats is the heating pipe passage way.

Now the passage way was proofed with silicone. I wanted to renew the silicon because I thought this might help.

This is how it looked with silicone: enter image description here

This is how it looks after removing it: enter image description here

What is this stuff inside that looks like loose wool? Should I replace it with something before I put silicone on it? Any ideas how can improve the proofing so that almost no smoke will pass through?

Edit: Heres a requested picture of the floor:enter image description here

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    If the entire floor is wood and it is not 'wood flooring' but just the base with carpet or something over it - I am sure you have leaks in more than one place. and then I would recommend to lay a sheet of clear plastic over the entire floor and install flooring over that. – Ken Jul 21 '18 at 10:43
  • @Ken sorry I am not sure if I have understood you correctly. I added a picture of our floor how it looks in our entire flat (except kitchen and bathroom). I do not know whats under it. You may be right, there might be more leaks. But I can identify that the mayjor sorce of the smell must come from the pipeline. If we have fixed it, have I understood you correctly that you would recommend to put another layer like a carpet or fake wood? – Adam Jul 21 '18 at 11:31
  • Wow! Those are some gaps between the floor boards! And you say that you think the tobacco odor is coming in around the heating pipes? – Jim Stewart Jul 21 '18 at 12:44
  • @JimStewart Yes. If I go with my nose to the pipe it smells very bad. If I go with my nose anywhere else on the ground I do not smell much. The gaps are only about 7mm deep. Its not that I can view my neigbour through it :P – Adam Jul 21 '18 at 12:48
  • how do you know that the source of odor is the pipe? .... it could be the gap under the wall near the pipe – jsotola Jul 21 '18 at 22:54
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It will very hard to prevent the odor of tobacco smoke from getting into your flat. I would not attempt to renew with that seal, you could make it worse. That wool could be anything from steel wool to copper wool to other fibers that you definitely don't want to do anything to. You don't want to disrupt it.

You could put some duct tape over the existing seal, but even that could cause problems. If any tape you placed there were later pulled off, it could pull apart the existing seal.

  • So you say I should just put silicon on it and leave the fibre alone? Do you have a recommendation which silicon I could use? I was thinking about something like this: ebay.com/itm/… – Adam Jul 21 '18 at 11:18
  • You could smear a layer of silicone rubber over it, and the product you list should work. Definitely DO NOT disrupt the fibre seal. Is this a rented flat? – Jim Stewart Jul 21 '18 at 11:26
  • Okay thanks. Yes its rented, but my grandmother is the owner of the flat. – Adam Jul 21 '18 at 11:28
  • What do you think about buying glass wool and putting on top of the existing fibre, and then making silicone on it? – Adam Jul 21 '18 at 11:32
  • Your grandmother is the owner of the flat you are in? There is already fibre there; I don't think you should add more. As far as the type of RTV silicone, it is hard to say which type would be better than others. "Gasket maker" might work or simple high temperature might be just as good for a little less money. – Jim Stewart Jul 21 '18 at 11:44
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You will need to lay some form of seal all the way across that floor - the smoke is simply coming through the flooring - the gaps in those boards etc.. you have pretty much the same air. You might lay a painters mil clear mat over the entire floor (seal around the ends ) and then put a carpet on top of that .. Much like a lid on a jar.

The only other solution is to move to a better place.

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