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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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. ...
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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 ...
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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,...
1 vote
1 answer
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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 ...
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Condensation in furnace intake

My furnace intake is getting some condensation in it. I has the coupling on it that is supposed to help with that but it is still getting in.
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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 ...
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2 answers
74 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 ...
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1 answer
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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 ...
2 votes
0 answers
142 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 ...
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1 answer
58 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 ...
1 vote
0 answers
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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 ...
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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 ...
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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 ...
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3 votes
2 answers
859 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 ...
1 vote
1 answer
107 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 ...
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1 vote
1 answer
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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 ...
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2 answers
57 views

Steam in bathroom

My bathroom originally vented into the attic instead of outside. I didn't have too much steam with this. A 3 inch vent was put on and exhausted out through the soffit. It wasn't effective. A new fan ...
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Question: Condensation - Insulation and a 130 year old double boarded house

I own a house that was built around 1890 to 1910 located in central Pennsylvania. It is a double boarded house meaning that it has no framing at all, it is a unique type of construction that was used ...
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3 answers
143 views

Will indoor moisture be a problem with an externally-insulated shipping container?

I'm watching this video by Belinda Carr where she advocates for insulating the outside of the shipping container. She contrasts shipping containers with conventional framed houses. This seems counter-...
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1 answer
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Heating cable combats condensation on sill of poorly insulated window?

At the start of the year (2021), it was suggested to me on another forum that heating tape might stave off formation of condensation on the bottom metal sill of a poorly insulated window. It is a ...
1 vote
1 answer
90 views

What are best practices to cool down a house without condensation?

I have a vacation house that I visit a few weeks a year, which faces a condensation issue. Indeed, when I stay there in winter, where the outside temperature is well below freezing, I measure around ...
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2 answers
268 views

Supply duct still condensating in basement

Thought i'd start a new question to see if I can get any new ideas. Overview: E. PA location. 2 year old new construction home, approx 1200 sq ft, open concept first floor (so all supply and returns ...
9 votes
3 answers
4k views

Central Air condensate is pumped into a hole in the basement floor?

I’ve tried to do some research on this topic but am a little confused and would like to know if I’ve got a problem here that I need to remedy. I think I want to install a self-draining dehumidifier in ...
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1 answer
130 views

B-vent condensation in large attic space

I have condensation in/on the B'vent flue pipe from my heater in the attic andit is dripping. The original B-vent flue pipe was corroded on the interior so we had the flue pipe replaced from the ...
2 votes
3 answers
163 views

Why does water accumulate on the hardwood floors in my 1930 home?

My home was build 1930 and nothing has been updated. In my downstairs bedroom under anything that sits on the floor from my bed, night stands, dog crate, and other things the floors will puddle with ...
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1 answer
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How to fix capillary action on anti-condensation coating on box profile steel roofing sheets?

We have some carports here that were installed by a previous owner a few years ago. They have side walls, but are open front and back, and have a steel box profile roof. Big green sheets like this: ...
-1 votes
1 answer
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Does mold in a loggia means that the loggia must be replaced?

My apartment has a loggia which used to be a balcony (it is now an extension of the living room without any separation between them - the door that was there was removed). This was done by the ...
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2 votes
0 answers
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Upper Floor Window Condensation Issues - HRV?

We live in a 2 level home with basement in central washington. The winters average 20-36 degrees Fahrenheit with humidity levels of 70-99%. Summers are fairly warm to hot with lower RH. Our issue is ...
1 vote
1 answer
591 views

Condensation forming on garage roof despite insulation

I have a condensation problem on the inside of my garage roof. I noticed it in November, lots of condensation forming on the roof but only at the back half of the garage which is slowly being ...
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1 vote
2 answers
158 views

Why does condensation appear on surface of window, but not all of them?

When I woke up this morning (a beautiful winter morning), I opened my curtains and noticed that the middle pane was covered in surface condensation, but the two adjacent panes were almost completely ...
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Bathroom condensation

My bathroom is mouldy and retains condensation on walls, windows etc. The room is approx 8fx7ft x 8ft high. I’ve installed a new inline Manrose fan with timer to replace cheap old online fan, the ...
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1 answer
222 views

Will condensation form and be an issue on an aluminium duct venting water heater exhaust?

I have built the unfinished chimney shown in the image below to get the exhaust for my neighbor's water heaters (which I believe are sealed combustion gas appliances, such as the Remeha Avanta water ...
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2 answers
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Window casing upgrade to plastic/pvc/vinyl/aluminum

I Just had two rooms added to the house, and I totally forgot to mention in the contract that I wanted the window casing to be plastic. (window frame? The internal part that encases the window ...
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1 answer
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How long a horizontal run will a condensate pump support?

I have the model 21786 condensate pump described below. The specs say it can push the water up 16' using a 3/8" PVC pipe. Does this mean it will do it in any possible direction (my case 8' to the ...
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5 votes
3 answers
485 views

Condensation on just 1 duct in unfinished basement

We live in the Northeast (PA) and have a new construction home that we have lived in for a year. The home is small (1300 sq ft, open concept first floor) with an unfinished basement. The ceiling of ...
2 votes
1 answer
786 views

How does the insulation value of multiple layers of insulation compare to a single layer of the same total thickness?

If I insulate a surface with two sheets of rigid foam insulation with thickness x, or with one sheet of otherwise identical rigid foam insulation with thickness 2x, how should I think about the ...
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Sheetrock on Walls Is Falling Apart and Cannot Find the Cause

In the corner of my bedroom i have discovered that the sheetrock on each wall was so damp that it is falling apart. One wall backs up to my shower the other wall backs up to the laundry room further ...
-2 votes
1 answer
397 views

How to determine if damp smell, marks, cracks, mould, on internal walls is from; rising damp : condensation or other

I live on the ground floor of an art deco complex, with 2 apartments above me. We have lived here for almost 13 years and have never had a problem with damp / mould issues....other than our bathroom ...
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1 vote
1 answer
494 views

Why is there condensation on a pipe near my furnace?

My AC says it is trying to cool to 73 but is reading 75. I changed the filter, which didn't help. I looked in the closet, and apparently the installers were supposed to install an "auxiliary ...
2 votes
1 answer
124 views

Type of insulation for flexible aluminum duct?

I’m replacing an undersized bathroom exhaust fan with a larger one that has a higher CFM. When switching the fan out, I want to add insulation to the flexible aluminum duct that goes from the fan to ...
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-1 votes
1 answer
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How to ventilate a chimney taken down to attic (roof line) level?

I had a leak in my chimney flashing, so the roofer recommended taking the chimney down to attic level. He repaired the roof where the chimney was (board, felt and roof tiles). All was good, but a few ...
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1 vote
1 answer
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Who can I hire to investigate a possible airflow blockage in my attic?

Had a new roof replaced last year, tear off/replace. Also had a new slider door replacing old one installed last year. I am noticing what appears to be staining where the ceiling meets the wall. ...
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3 votes
1 answer
952 views

Is this an acceptable way to fix garage roof condensation?

I'm in the UK. My garage has a corrugated metal roof with no insulation. In the winter, when it rains the underside of the roof drips. Not massively, but just enough to be annoying. The roof ...
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1 answer
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Is a peltier-based dehumidifier a good choice to prevent condensation?

I have a non-heated, enclosed space (crawl space that does have a vapor barrier). During a limited number of days in the spring or fall, I get condensation on things that stay cold while the air ...
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190 views

Condensation and air leak from skylight

I Recently started seeing condensation on my skylight. Skylight is installed in the bathroom. Sometime on windy day I feel air coming through skylight. If I raise my hand up towards it I can feel ...
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1 vote
2 answers
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I have an indoor swimming pool - can I have a large mirror, or will it be steamed all the time?

I have a dehumidifier in my indoor swimming pool room, I would like a large dance mirror on the wall - would it be constantly covered in condensation. My room humidity is controlled to 50%. Just don’...
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1 vote
1 answer
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Water leaking around window when it is NOT raining!

I need help! In February, we noticed that there were some brown water drips on the window frame above our kitchen sink, not in a crevice or corner, just hanging from the middle of the wood frame! ...
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3 answers
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Solution to put down a window sill crack to prevent mold

I have a couple windows where there is a space below the window that goes into the wall (see bottom of picture). There was mold and condensation all around the area, so I'm guessing there's mold down ...
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2 votes
2 answers
634 views

Finishing drywall that abuts against metal frame prone to condensation

I have a interior soffit (that encloses a structural beam running along the exterior of the building) directly above an exterior sliding door. The drywall covering this soffit abuts right up against ...
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1 vote
1 answer
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High humidity in bedroom and condensation

I have a Bungalow build 1950s cavity walls not sure if they have insulation in the cavity. Suffering from really high humidity in main bedroom 74% overnight dropping to 59/60 in day. Window and ...
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