Condensation running down pipe connecting furnace thru ceiling to chimney

I had a new downflow 80% efficient furnace installed in 2006. I don’t use it regularly as I normally heat my home with my woodstove (separate chimney). But I have used this new furnace many times during “in between” weather, and when I have been out of town. It has always worked fine. Then in 2011, I used the furnace regularly for a few months that winter. I noticed that I had water or condensation running down the pipe that goes from my ceiling to the furnace – it would happen after the furnace ran for a bit. It got to the point that I had to put a pan on top of the furnace to catch the dripping “water”. My immediate thought was that my chimney stack must be cracked as I know the hot air from the furnace meeting the cold air in the stack (if it were cracked) would cause condensation. But after taking off the chimney cap and checking – the stack is fine. My chimney cap was blown off during a windstorm, and now is slightly damaged and sits a bit lower than previously. Could this be causing this problem? I was told by one furnace guy that my chimney stack is too large, and that it needs to be lined to make the opening smaller, and to replace the chimney cap. He swears this will take care of the problem. I’m just wondering why it took 5 years before I had a problem. Could it be because I was not running it 24/7 like I started to in 2011? I hate to pay for all this work if that isn’t the solution?

What thickness Styrofoam should be used to insulate a toilet tank?

So, based on my question here, I like the idea of insulating the inside of the toilet using Styrofoam because it seems more interesting/fun than installing a mixing valve. I plan to use silicone caulk to adhere the Styrofoam to the tank and fill the gaps/seams.

How thick should the Styrofoam be to properly insulate the tank and prevent condensation on the exterior?

How can I eliminate condensation on my toilet tank?

My toilet is getting a great deal of condensation on the tank and dripping onto the floor. What can be done to address condensation on the exterior of a toilet tank?

Should I add an escape register for added ventilation in A/C duct to reduce condensation?

I have a condensation and drippage problem where my 8″ exposed circular AC duct comes out of the ceiling. Above the ceiling is the attic, meaning it gets pretty hot. The pipe comes out of the ceiling then makes this visible 90 then goes through the wall, makes another 90 before the first register in the hallway. Then there is one more dead end register in another bedroom. I was thinking the this elbow here in the picture, along with another elbow downstream without any escape in between, could be inducing condensation

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The I was wondering if another “moisture escape” register would take care of the problem just in the middle of the horizontal part of the pipe between the elbow and the wall. See the red rectangle drawn on the below picture for the proposed location.

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It can also be seen in the pictures that the short stretch of the pipe inside the ceiling but just before it comes out is uninsulated, the contractor left it like that because he put a damper there and there will be a access panel entrance in the ceiling nearby. I do plan to insulate that stretch but was not sure if that alone would solve the problem.

The overall question being, what will solve this problem? Just added insulation, an escape register, or both? Or something third?

What makes water condense on the interior of the windows at night when it's cold? [duplicate]

This question already has an answer here:

How can I prevent condensation under vapor barrier on a 1st floor room with flooring?

We bought last year an apartment of the 1st floor. The building has garages and utility rooms right under our level and the two bedrooms face north. One of the bedrooms has actually an external wall also to the east. Insulation in the building is rather poor (80′s built). Both bedrooms have wooden floor (the clicking type) made by previous owners. Under this wooden floor there is a plastic (a vapor barrier) and under it a concrete surface. The east-north bound room is suffering from condensation mold and after thorough investigation there is mold under the vapor barrier and on to the concrete surface. We plan to have the building insulated externally but until then I must do something to help the room.

I know how to clean it but how can I prevent it from appearing again? if I put a mold resistant paint of the concrete surface, will it be safe? it is a bedroom and we use it for sleeping as well as a home-office, I would hate to find the same problem next year.

How useful is silica gel for protecting SLR cameras against condensation from changes in temperature?

I am planning to travel to places like Switzerland (Mt. Titlis) which has temperatures going down to -15 C.
I have the Nikon D3100 SLR camera.
I am not sure about the performance of the camera in such conditions (and the precautions to take).
I am planning to put 2 small pouches of silica gel in the camera case/bag.

How useful is the silica gel in protecting the camera for any kind of condensation issues that may arise due to change of temperatures?

What kind of damp do we have?

We have a damp problem in a 1920s semi-detached house we moved into 8 weeks ago. We are not sure if it’s a condensation problem, or penetration from the outside, or even rising damp on the ground floor. I have taken pictures of the affected areas:

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The full set can be found here:

The windows are all PVC which looks completely sealed – there don’t appear to be any trickle vents. We do notice occasional condensation on the windows in the morning. We need to get the windows replaced with wooden-framed windows again (in accordance with local building preservation-area regulations – originally, this house had wooden-framed windows). Would doing this help? Is there anything we should look out for? Can we get trickle vents on wooden frames?

The walls do not have a cavity. I think there is just two layers of brick, with an external render. The external walls are often quite cold to the touch.

We tried to clean the affected areas with Auro Mould Eliminator a few weeks ago, but it’s either been ineffective or it’s just the stains that remain. We are going to repaint anyway, but before that, we want to take some preventative measures so that the problem doesn’t come back and are looking for advice.

We have been suggested to get the external render of the house looked at in case there are cracks that water is coming in through and get it patched up. Searching around online, people advise getting dehumidifiers to help with condensation. Are there any other measures we can take?

How do I prevent condensation on my balcony windows?

On the street, temperatures at night are about -5 °С and about 8 °C during the day. In the apartment it is about 25 °C. So, there is condensation on the windows and I don’t want to wipe the windows every time.

How do I prevent condensation on the balcony windows?

Do Silent Condensate Pumps for Air Conditioners exist?

I need to install a Condensate Pump in a new A/C in a bedroom, and there is no choice but to pump the condensate up to a drain on the roof.

The A/C technicians have told me about different types of condensate pumps, but they all seem to make an audible sound on regular basis when the pumping action kicks in, and even though the pumps would be on the outside of the wall of the bedroom, they will be right next to a window that will be next to a bed, so my fear is that the regular sound of the pump will be just loud enough to drive me insane as I wait for the next pumping round to kick in, and the next, and the next…

So I was wondering if there are any silent condensate pumps on the market that are also reliable and that will last for years without requiring maintenance.

Any ideas?

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