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Questions tagged [condensation]

Use this tag for questions that involve the unwanted appearance of condensate or liquid water from an air stream that contains water vapor. Most often water condenses out of a warm air stream containing water vapor due to a change to a lower air temperature or the air stream passing over a cool or cold object such as an HVAC evaporator coil.

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Condensation on spray foam in basement

I am in the progress of having a home built and we are presently at drywall stage so humidity is fairly high in the house. Our 6’ concrete crawl space will be heated. We have two construction heaters ...
Dave's user avatar
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15 views

Adding insulation to a loft conversion & condensation build up concerns

I just moved into a property and I want to get some insulation added to the existing loft conversion as it gets mighty cold up there. I've had a look via the eaves and there is about 8-10cm of space ...
Alex Fox's user avatar
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95 views

What is causing water collection on inside of concrete ceiling

This is a picture from the inside of a 1970's concrete build house in the UK; as far as I can tell there is no cavity wall (definitely no insulation) so that both walls and ceiling are exterior facing ...
nox's user avatar
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1 answer
57 views

How to address frost/condensation on underside of roof decking in attic

located in the midwest with cold winters... Decade old asphalt shingles on ~23 year old house. Recently noticed two minor water spots on the drywalled ceiling and when going into the attic noticed ...
Michael's user avatar
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0 answers
55 views

Why do we have condensation and temperature drop around prefab fireplace?

We moved to a house with a wood burning prefab (or zero clearance) fireplace that was installed when the house was built (1986). It is in a corner in our living room, diagonal to an exterior wall and ...
Daltoniana's user avatar
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2 answers
68 views

Need help unclogging condensate drain for furnace

https://imgur.com/a/Ov8bRGq Bryant furnace model: 912SC48060S17 We have sever weather here in Portland, OR and my Bryant/Carrier furnace is blowing cold air with status code 31. Replaced filter ...
javanoob's user avatar
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32 views

Condensation and potential mold on inside of arch window

It's a single pane window and the condensation is on the inside of the window. Also, should I cut out what appears to be mold on the wood trim?
homeimprovementjohn's user avatar
1 vote
2 answers
227 views

water condensation inside electrical conduit running on attic

Today my TP Link Kasa smart switch started acting strange (turning on and off randomly) - it is broken now. When I hit reset button, a few drops of water dropped out. I removed the plate, pulled the ...
Arek's user avatar
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2 votes
1 answer
171 views

What might cause this odd condensation pattern on new siding?

I got new siding installed last year (Hardie board). They replaced the sheathing as well (it was that crumbly tar covered stuff) with OSB. They also installed house wrap (as I previously did not have ...
negacao's user avatar
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-1 votes
1 answer
101 views

Cast Iron Sewage Vent Pipe Condensation Freezing Problem

this winter I noticed condensation freezing on my sewage vent pipe. I know I'll need to remediate the area after the fix. Any recommendations or experience with this type of problem? For context if ...
Newguyoldhome's user avatar
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1 answer
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Discolored wall/ceiling I think from condensation. How do I prevent it further?

Area near ceiling/wall is discolored a little dark, kinda like it's dirty/dusty. Only in master bedroom. There is no door between bed and master bath. I think it's from my wife's long showers having a ...
Supe's user avatar
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how to handle steam/condensation from baseboard steam radiator

The baseboard steam radiator we had installed in 2016 as part of a kitchen renovation often causes water to pool on the (hardwood) floor because steam/condensation from the outlet doesn't seem to have ...
newton10471's user avatar
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Vaulted kitchen ceiling but now have moisture between roof and insulation. Possible cause and remedy? [closed]

We're re-doing our kitchen and decided to vault the ceiling. Previously, above the ceiling there was a good amount of attic space but now the insulation is right up against the inside of the roof, and ...
Vic's user avatar
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1 answer
93 views

Condensation/mold on ceiling in bedroom + high humidity

I am having a strange issue wherein along the exterior/west-facing wall of my bedroom (~110sqft/750sqft house) at the junction with the ceiling there appears to be mold growing and some pretty faint ...
Vincent Huynh's user avatar
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0 answers
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I have doubled up Polysterene 2mm on wall insulation to make 4mm is this ok

I recently applied 2mm polystyrene insulation to my walls with thermal adhesive. I now feel that 4mm would have been better, can I apply adhesive on top of the polystyrene and then add another layer ...
Rafa's user avatar
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1 answer
301 views

How do I fix condensation on aluminium step of the front door?

My door frame seems to be insulated well inside all around except door step that is aluminium. That aluminium piece seems lacking the thermal break, and now with cooler temperatures it accumulates ...
Vetl's user avatar
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2 answers
530 views

Why is my neighbor's A/C causing my walls to sweat?

Whenever my neighbor runs their air conditioner for an extended period, my room, which shares a concrete wall with theirs, experiences condensation issues (my wall starts to 'sweat'). After ...
user2965583's user avatar
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What might cause sporadic small waterspots on ceiling of kitchen?

I have small (ranging from ~1-5 CM) ,sporadically located, water spots on the ceiling of my kitchen that have progressively gotten worse over the last year. They seem to be right in the dead center of ...
Logan McNulty's user avatar
1 vote
1 answer
288 views

Is this water heater condensation or leak?

Thanks in advance for reading this and helping me out a bit, as I am not sure if our water boiler needs to be replaced. We have a AO Smith natural gas water heater that is about 14 years old. During ...
John Y's user avatar
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1 answer
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Can I insulate between a flat roof and a sloping roof

I have an extension on the back of my house which originally had a flat roof. At some point, a previous owner had a sloping roof put over the flat roof which covers it completely (i.e. it is not ...
danwellman's user avatar
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2 answers
207 views

Where is the moisture coming from that is condensing on my ridge beam?

I'm renovating my home, and in the course of hunting for a leak in the roof (now found) I removed a strip of drywall that is 8" wide and 16' long, parallel to the 6x12 ridge beam. See image below ...
tom's user avatar
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1 answer
61 views

HVAC condensation drain and weird concrete bulge [closed]

Does anyone know why I developed a bulge on my concrete near my condensation drain? And what is that copper pipe coming up from the floor?
joyf's user avatar
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0 answers
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Main condensation line drilled and left inside 4"x12" main structural support

Latent defect found by new licensed HVAC technician after original installer of unit said call somebody else. Ten year Carrier warranty now out. Not servicing my area. I called a new company out since ...
Elisa's user avatar
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-1 votes
1 answer
64 views

Condensation on air filter

So I purchased my house in 2015 at the age of 24. I was an idiot and did not take care of my new hvac system (replaced when they flipped this house before I bought and is an electric heat pump) like I ...
Qiuzman's user avatar
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2 answers
74 views

What could cause an air conditioner to leak condensation?

For the past couple weeks, there’s been a trail of water leaking from my furnace. I believe it is condensation from the air conditioner. After doing a little research online, I cleaned out the U trap, ...
user170735's user avatar
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1 answer
148 views

Greenish/Gray Mold on all beds and matresses [closed]

I moved to a new apartment unit in the beginning of the year and then I went away for a 2 week trip and when I came back I noticed greenish dust on the the furniture. I google it and found out that it ...
ab801's user avatar
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0 votes
3 answers
457 views

DIY double-pane window renovation technique? [duplicate]

If a double-pane window suffers from only condensation, can a motivated DIYer separate the panes and spacers, clean them, and reassemble? On a dry day, of course.
Gorno's user avatar
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1 vote
0 answers
68 views

Why plaster in one corner under ground level wet?

One corner of my house plaster wall is starting, this Winter, to show condensations. As you see in the first picture below it's like drops of water starting to form. This is the stair area going to ...
BlueSky2010's user avatar
1 vote
1 answer
2k views

My condenser dryer is steaming up my kitchen and utility room

An engineer fitted a new pump to my AEG Lavatherm condenser dryer. It still has not solved the problem of a very hot steamy kitchen, when I'm drying my clothes.
user162161's user avatar
1 vote
3 answers
4k views

Condensation in bathroom after shower

Everytime you take a shower, the walls and ceiling have lots of water on them. After the shower, some (not alot) of water will come dripping in from the extractor fan duct onto the floor. Location UK ...
Cheetah's user avatar
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1 vote
0 answers
91 views

Positive Input Ventilation (PIV) suitability for loft with high relative humidity

I live in the UK in a cold 1890s stone walled house which has a condensation issue (partly brought on by lifestyle choice and party due to previous "remedial" works that limit the natural ...
AWGIS's user avatar
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0 answers
135 views

New external door, lots of condensation

I just had a new fiberglass external door installed (with a half lite). The glass has no condensation on it, but the door itself is covered in condensation! I installed another door at the front of my ...
Breedly's user avatar
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0 votes
1 answer
145 views

Do I need existing wallpaper to help with external damp wall?

We have a north facing 1st floor bedroom (above a kitchen) which has always typically had some damp issues. It has 3 external walls with blank but painted over wallpaper, that gets replaced every 10 ...
Ian's user avatar
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0 answers
95 views

Condensation pipe from air handler is making gargling sound

I would appreciate some help on a new gargling voice coming from my HVAC furnace (first time using this season - this didn't happen last year). As shown in picture, there are 2 small tubes coming out ...
tipsytopsy's user avatar
0 votes
1 answer
213 views

Exterior condensation on some newly installed windows

We installed 5 new windows (3 panes) in our house. 2 of them regularly get exterior (outside) condensation, the others are fine (or get considerably less). This happens when outside humidity is high (...
eimrek's user avatar
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0 votes
1 answer
185 views

What is this thing under my window frame?

I've got 2 windows, one with a block of some sort under the frame, and one without. On the one without, in winter, condensation tends to form on the frame, and then the water trickles down the wall. ...
l0r3nz4cc10's user avatar
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0 answers
117 views

Is condensation a concern on duct work that's enclosed in a soffit?

In my 1973 town-home, which is basically a ranch style layout, there's a single hallway that runs parallel to the length of the unit, bisecting the living area from the bedrooms. It is the only ...
Jon Griffith's user avatar
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0 answers
2k views

Floor drain is overflowing next to furnace

We have our furnace on the second floor of our home. There is a pvc pipe coming from the top part and it leads to what looks like a floor drain. The last couple of weeks when our air conditioner is on,...
L. Johnson's user avatar
1 vote
1 answer
870 views

How to fix wall with internal water damage

We had some work done in our home and we had the attic exposed, with a window open, and the AC running all day long. This caused one of the ducts, which lacked insulation, to sweat and drop all the ...
JacobIRR's user avatar
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1 vote
2 answers
83 views

Home condensation pump emptying into sewage pipe. Is this functionally okay?

I was looking at a house and noticed they had a condensation pump for a hot water heater going directly into one of the houses sewage pipes, which empties into the property's septic tank. See images ...
Tool Time Garry 's user avatar
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1 answer
281 views

Should this pipe have condensation inside of it?

Just wondering if it’s normal for some condensation buildup inside this pipe on my HVAC unit. It doesn’t appear at this time that there is enough condensation to drip down onto the electrical ...
Mr. le's user avatar
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0 votes
1 answer
111 views

Basement moisture: condensation or leak? [closed]

I have a significant amount of moisture built up in our unfinished basement that’s originating from the well water pump. I’m trying to decide if it’s even possible that the moisture could be a slow ...
Austin Seward's user avatar
2 votes
0 answers
332 views

Why is my AC smelling bad and producing no condensation water?

I have a 10-year Carrier unit. It has two issues. The AC smells musty when turned on. It smells even worse when I turn on the fan mode after running AC. No smell when running on heat. It's similar to ...
greatman's user avatar
0 votes
1 answer
356 views

Moisture in bay window bench seat

I live in a 1940s house with uninsulated double brick wythe exterior walls. The interior wythe has some kind of masonry skim coat. The front wall of the house has a bay window. Last spring, I built a ...
1941House's user avatar
1 vote
0 answers
38 views

Is primary/secondary system the right setup for condensing boiler?

Recently we've just installed Lochinvar NKC199N by a local contractor here, using liquid propane. Since this is a condensing combi-boiler, I understand that it will be running up to 95% efficient when ...
ysok's user avatar
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1 vote
0 answers
525 views

Why does my boiler inlet pull hot water from the outlet?

Last month we installed a Lochinvar NKC199N, using LP Gas. Attached is a picture here for the reference. We have 4 zones, but let's forget about the other 3 zones as I am having issue with one zone ...
ysok's user avatar
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0 votes
1 answer
412 views

Condensing boiler outlet temperature for floor radiant

We've just installed a new Condensing Combi boiler last week, Lochinvar NKC199N. I've noticed the installer set the outlet temperature to 180F/82C and the return temperature to inlet is somewhere ...
ysok's user avatar
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3 votes
2 answers
2k views

Closing a skylight with gypsum board

We have a fixed skylight in the point of the house where we have stairs and this continues to an office that we have. Therefore the office is in an open space with the stairs and the skylight. This is ...
Haris Eliades's user avatar
1 vote
1 answer
892 views

Insulation boards with foil facing outside - condensation issues?

AFAIK the best-practice for applying insulation+vapour barrier in cold climates is: inside -> inside wall -> vapour barrior -> insulation -> outside wall (exposed to the elements). If you ...
Birdman's user avatar
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1 vote
1 answer
442 views

Newly installed heat pump system - Air Handler condensate leaking out of ceiling

I recently had my a/c system replaced with a heat pump system (Less than 2 weeks ago). The original was a 2.5-ton a/c. The new system is a 3-ton heat pump. I'm now having all sorts of drainage issues ...
Curious-Ninja's user avatar