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Old 05-29-2020, 03:29 PM   #16
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Re: very high house humidity


I'm sitting in a cape so understand their issues. Do your side attics have a plywood floor or exposed insulation?

If plywood floor the issue of blocking is less important. If exposed insulation then the blocking will reduce heat loss.

However, currently outside air looks to be dryer than main house so any infiltration from above or below is not contributing to the high humidity.

An 04 house might be tighter than 10 or 20 years earlier but they didn't get real serious about sealing until a bit later. High humidity in the winter is one of the indicators of a tight house.

You said you use the bath fan but did not mention letting the fan run any extra time after the shower. They make switches with a delayed off capability so you can select an added run time. The RH readings in there will tell us if that is contributing.

Sorry for all of the questions, troubleshooting in the blind from long distance is a challenge.

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Old 05-29-2020, 03:51 PM   #17
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Re: very high house humidity


One attic space has plywood on top of insulation, the rest is just insulation, nothing covering it.

We do run the fan for a while after using the shower. But the humidity was in the house when I woke up Thursday morning after leaving the windows open Wednesday night. So at this point I don’t think it’s the bathroom since the humidity was there before we even showered on Thursday. But could our fan not be hooked up correctly? My fiancÚ says it is.

I’m in my parents house right now and their humidity thermometer says it’s 80% in here too. But all the windows are wide open and doors. Their house feels nothing like mine. It just feels normal. Floors aren’t wet, couches aren’t wet. In my house everything I touch feels wet.
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Old 05-29-2020, 04:29 PM   #18
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Re: very high house humidity


Hmmm! There are places where you can look that would most likely have been sealed if the house were intentionally built tight. From the basement look at all penetrations going up through the floor. Electrical holes should have been sealed but look for plumbing, main vent stack, under bathroom and kitchen sinks, and under showers/tubs. Often a large opening is created in those areas that doesn't get sealed up. Also your chimney if you have one, check around the opening going up.

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Old 05-29-2020, 04:31 PM   #19
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Re: very high house humidity


What's the temperature of the cold water at the kitchen faucet after its allowed to run a couple of gallons? If 80 room temp. and 80% humidity the faucet will condense water if it's below 73░.
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Old 06-06-2020, 11:50 PM   #20
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Re: very high house humidity


If your windows are open, the inside humidity will match the outside summer air. Why no HVAC? All modulars ship with HVAC.
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Old 06-06-2020, 11:55 PM   #21
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Re: very high house humidity


Buy a few large window AC units and let them dry out your inside air?
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Old 06-07-2020, 07:19 AM   #22
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Re: very high house humidity


What was the temperature outside, in the living room, in the basement, upstaairs, etc. at the times the humidities in those respective locations were as you stated?


If you put a fan in a living room window to exhaust (and keep changing) the air and overcome the air resistance of the insect window screen, and run that continuously all day, then does the humidity in the living room drop to more or less match the humidity outside?

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Last edited by AllanJ; 06-07-2020 at 07:27 AM.
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Old 06-07-2020, 07:44 AM   #23
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Re: very high house humidity


We don't have a description how the clothes drier ducting exits the basement. Consider drying the clothes on an outdoor clothes line for a month to determine if that's the problem.


EDIT: EDIT:
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Old 06-07-2020, 10:45 AM   #24
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Re: very high house humidity


A modular house and it was built very tight? Maybe vapor barrier inside? What's attic made of, maybe not breathing there. How about focusing on one room, bedroom with a door? Temp cover the duct covers, if have, and run the dehumidifier and see how the humidity measures as well as how things feel to touch? Maybe the finished upstairs room was done so that rafters or the attic above doesn't breathe.

Also vinyls, leather and very old shellac furniture finish can start to feel sticky. Sticky floor is normal, I think.
You might want a moisture meter, with pins, and test the drywall.
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