Major condensation in top floor of brownstone
Mold/condensation question I’m going to throw out here: I have a SERIOUS problem with hot, damp air coming in to my top floor apartment via a vent next to the (non working, blocked off) fireplace. It’s an old brownstone that hasn’t had much done to it, our neighbors below have no issue. But the living room smells musty/moldy and feels like someone just took a long, hot shower in it. The paint is bubbling in some spots and condensation collects on the exterior wall, ceiling, crown moulding and windows. This DID NOT happen last winter and is not happening in the other room. Has this happened to anyone out there? Any clue as to what would cause the vent to spit out all this moist air? I initially thought it might be a leak in the chimney, but I’m not sure. I am renting, the landlord is unconcerned and seems to think it’s just “extreme weather” paired with the heat being cranked up. While that may be a contributing factor, I don’t think it’s the main issue. Some photos below. Any advice greatly appreciated!

cliftonetc
in Walls and Interiors 10 years and 5 months ago
32
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alicemurphy | 10 years and 5 months ago
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I am suffering through excess of mould growth in bathroom. I know this happens due to poor ventilation. Condensation in bathroom mainly caused when hot steam hit cold walls and it takes plenty of time to dry wall after someone showers. We have water-repellent paint on our bathroom walls where water can dry easily but condensation happens enough these days and the wall provide perfect breeding area for mould.

steam_man | 10 years and 5 months ago
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How you didn’t die of CO poisoning is beyond me. I didn’t give any credence to the collapsed chimney theory because I figured the CO would have done you in. Wow. You are so lucky, you have no idea.

cliftonetc | 10 years and 5 months ago
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Thanks again to everyone for the input. A chimney person has been able to confirm that the chimney was obstructed near the roof and the liner was in bad shape. The air had managed to push through the deteriorated bricks and make its way to the old ventilation shaft. Until the moment when the heat was shut off the landlord wasn’t responsive, she now realizes the critical nature of the situation and what could have happened. Again, thanks all!

BobMarvin | 10 years and 5 months ago
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With no heat shouldn’t you be calling your landlord and/or 311?

Arkady | 10 years and 5 months ago
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Are there other tenants between you on the top floor & the people on the bottom floor who are away? If so, have you asked them if they have any problems &/or heat?

Rick | 10 years and 5 months ago
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I still think you have blockage in the chimney and it’s not venting properly. I have seen this before. Since you are on the top floor I’m betting you have blockage between the fireplace and the top of the chimney. The vent in your wall is a leftover from an old forced air system that is no longer used because you have steam radiators. The constriction in the chimney is pushing the exhaust through the old decaying brick in the chimney and leaking into your apartment. Please let us know what happens when it finally gets fixed.

cliftonetc | 10 years and 5 months ago
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Thanks! We need it! It’s supposed to hit the single digits this week…

BobMarvin | 10 years and 5 months ago
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It’s probably a good thing that your heat has completely stopped working. At least your landlord will no longer be able to say that he “doesn’t think there is actually an issue”. Good luck!

cliftonetc | 10 years and 5 months ago
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You seem to be a man who knows his steam! Forgive me while I ask some questions… If it broke down near the boiler, would our neighbors below also be getting the same hot/wet air? What does blowing a “main vent” entail? Should we be concerned that the heat has turned off, or might that just be an indication that something has tripped the boiler? Thank you!

steam_man | 10 years and 5 months ago
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Then you may have a busted steam line in your boiler room. Or a blown main vent.

cliftonetc | 10 years and 5 months ago
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I’m almost certain the two issues are connected in some way as they start and stop at the same time. Whether that means something is busted somewhere else along the line that is sending the hot/wet air up the old vent shaft or something else, I just don’t know. But hot/wet air shouldn’t be pushing out above the fireplace, either. We don’t get our heat from this vent and normally nothing ever comes out of it. Steam is still coming out of the chimney on the roof, seemingly as normal. Or was, until the heat stopped.

steam_man | 10 years and 5 months ago
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The heating duct and the chimney are in no way connected. The liquid is just condensation seeping through the wall or metal and picking up that discoloration. Seems like two different problems since they are coming out of two places that are not connected.

cliftonetc | 10 years and 5 months ago
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Not sure what the boiler is, since we don’t have access to the basement. To make matters worse, the tenant who is on that floor is out of town so there’s no way to get to it now. It also seems that some warm/wet air (when the heat was running) was coming out above the (now decorative) fireplace above a permanently mounted mirror. Some strange rusty/oily liquid also appeared on the mirror the day before yesterday, a long drip down the surface, as if something strange was happening behind the mounted fixture. Is it possible that maybe something in the chimney has broken/collapsed/become blocked forcing some air into the inactive duct?

steam_man | 10 years and 5 months ago
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Ok just saw them. Do you have a condensing boiler by any chance? If so then some low bidding idiot ran the exhaust into the old heating duct and is causing you major problems. If you have forced air (furnace or air handler) then most likely you have a leaking coil. I’m betting on the leaking coil. Since you say your rads aren’t getting hot either.

cliftonetc | 10 years and 5 months ago
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I have a few photos posted in the thread above, from Feb. 20. We aren’t able to really see down the chimney. In addition to not being terribly excited about being on the roof in the first place, it does have a newer cap that would prevent us from looking straight down. I could probably get my phone through to take a shot, but again- I’m a little nervous on the roof in general. NEW DEVELOPMENT: the steam seems to have stopped. BUT SO HAS OUR HEAT. Heat has never come in through this vent until now, but seemingly with the heat off all together the problem has paused. Hopefully we’ll be able to get someone in to look at it in the next few days. In the meantime, it is very cold in our apartment.

steam_man | 10 years and 5 months ago
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How about a picture of the “vent” in question. That would be helpful in assisting you.

cate | 10 years and 5 months ago
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Agree it sounds like a water/steam pipe leak. If the issue were boiler exhaust leaking through the chimney you would most likely smell the exhaust — like what comes out the back of a bus. If you have oil heat, that is. Maybe there is no smell for gas heat. Not sure. If you do have a chimney leak, it’s potentially lethal so be sure it isn’t that. A licensed plumber who specializes in steam heat can take care of the former. A chimney person can fix the latter but may not be able to diagnose. To rule out a CO2 leak, could get someone in there such as a plumber w sensitive equipment to do a reading.

Rick | 10 years and 5 months ago
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“There’s also not one bit of snow, ice or water on our roof– we just popped our heads up to check. Some steam is coming out of the chimney, as per usual” Can you look down the chimney with a bright light? If there’s some blockage it would make a backdraft.

cliftonetc | 10 years and 5 months ago
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We have it loosely covered with an old towel just just absorb most of the moisture as it enters the room, there’s a pyrex pan on the ground which is collecting some of that moisture. Better on the floor in one spot where I can easily (and frequently) sop it up. The wall is already pretty gross and I’m sure will need to be stripped/dried out/whatever they need to do to moldy walls. New development: greasy looking drip of strange liquid coming down the mirror mounted in the wall above the fireplace. There’s also not one bit of snow, ice or water on our roof– we just popped our heads up to check. Some steam is coming out of the chimney, as per usual. Thanks all for input and thoughts. Once we have someone look at it I’ll report back. Again, we’re just renters and our landlord doesn’t think there is actually an issue.