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Old 01-18-2019, 10:54 AM   #1
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Moisture in closet


Hi guys, been on here reading for a while but my first post.

I have a bonus room above the garage that was finished about 10 years ago. I had a couple closets put in and access to the attic. Just storing old boxes up there. The garage is not heated but has drywall and insulation on the walls. The house was built in 2000.
I havnt had any problem until just now. I wanted to get behind the wall to put a couple more things. The access is in the closet so I have to take everything put to get to it. The room is heated, stays about 60-65 during the winter.
I started to take the stuff out of the closet and found moisture and mold on the walls.
I removed all the stuff and am in the process of looking through it to see what got damaged.
I sprayed the closet walls with a bleach solution to kill the mold.

My question is how to fix this so it doesnt happen again.
I dont think that this was because of a leak. I looked around and didnt see anything on the outside of the closet walls or roof.
I believe this is just moisture/condensation.
I'm attaching pics, if I can, of the closet. The back of the closet with the insulation and the attic space behind the closet.

Do I need more insulation behind the closet? Or is this an airflow issue?

I'll try to answer any questions best I can.


Live in west michigan.

Thanks.

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Last edited by moosehaed; 01-18-2019 at 11:06 AM.
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Old 01-18-2019, 10:56 AM   #2
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Re: Moisture in closet


Pic 1 is the closet.
Pic 2 is behind the closet.
Pic 3 is the door to the attic.
Pic 4 is above the closet.

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Old 01-18-2019, 11:22 AM   #3
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Re: Moisture in closet


Lack of air circulation is a big factor. The HVAC doesn't do a whole lot for a closet [without vent] and then stacking stuff in there just makes it worse. Fairly common problem.
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Old 01-18-2019, 11:25 AM   #4
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Re: Moisture in closet


Quote:
Originally Posted by mark sr View Post
Lack of air circulation is a big factor. The HVAC doesn't do a whole lot for a closet [without vent] and then stacking stuff in there just makes it worse. Fairly common problem.
Yes I know I probably had too much stuff in there. It was full.
This is the first time this happened.
What's the best solution?

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Old 01-18-2019, 11:42 AM   #5
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Re: Moisture in closet


There is warmer closet air reaching walls that are below dew point temperature. For a starting point locate those cold walls with a thermometer and correct the insulation problem / air leak problem or both.
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Old 01-18-2019, 11:52 AM   #6
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Re: Moisture in closet


Insulate the exterior and supply conditioned air to the space to keep it above dew point and circulate the air.
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Old 01-18-2019, 11:56 AM   #7
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Re: Moisture in closet


With the closet doors closed there is not enough heat in there to maintain wall temperature so you will have condensation on the walls in there.


Insulation for the little attic doors??
Maybe louvered doors for the closet.
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Old 01-18-2019, 11:59 AM   #8
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Re: Moisture in closet


Quote:
Originally Posted by Windows on Wash View Post
Insulate the exterior and supply conditioned air to the space to keep it above dew point and circulate the air.
I'm not sure if there is any way to add air circulation. There is a small gap around the doors, about 1/8 inch.
I'm going to add some more insulation.

Do I need an air gap between the garage ceiling and closet floor?

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Old 01-18-2019, 12:02 PM   #9
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Re: Moisture in closet


Quote:
Originally Posted by moosehaed View Post
I'm not sure if there is any way to add air circulation. There is a small gap around the doors, about 1/8 inch.
I'm going to add some more insulation.

Do I need an air gap between the garage ceiling and closet floor?

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No that should be full .
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Old 01-18-2019, 12:03 PM   #10
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Re: Moisture in closet


Quote:
Originally Posted by Nealtw View Post
With the closet doors closed there is not enough heat in there to maintain wall temperature so you will have condensation on the walls in there.


Insulation for the little attic doors??
Maybe louvered doors for the closet.
This is the gap on the doors. Do you think if I add a thicker rubber stop to create a larger gap that would help?

Which do are you referring to insulate? The closet doors or the access door to the attic?

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Old 01-18-2019, 12:06 PM   #11
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Re: Moisture in closet


Quote:
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No that should be full .
Ok. I'll look to see if I can add more insulation under. Ihave some faced R-13 that I'm a try to stick under

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Old 01-18-2019, 12:13 PM   #12
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Re: Moisture in closet


Make the closet a cold storage with a sealed door to keep the moisture out of the space.


https://www.pinterest.ca/pin/45599014957114476/
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Old 01-18-2019, 12:17 PM   #13
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Re: Moisture in closet


Quote:
Originally Posted by Nealtw View Post
Make the closet a cold storage with a sealed door to keep the moisture out of the space.


https://www.pinterest.ca/pin/45599014957114476/
Thanks I'll do that to the access door.
Is that insulation or foil lined wood? Cant tell from pic.

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Last edited by moosehaed; 01-18-2019 at 12:24 PM.
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Old 01-18-2019, 12:33 PM   #14
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Re: Moisture in closet


Quote:
Originally Posted by moosehaed View Post
Thanks I'll do that to the access door.
Is that insulation or foil lines wood? Cant tell from pic.

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I don't know who makes them but here we see what looks like a small interior door that has foam board inside it and it is hung in an exterior 4 sided door jam with the weather stripping like an exterior door. Then some people glue another foam board on the attic side.
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Old 01-18-2019, 06:35 PM   #15
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Re: Moisture in closet


From inside the attic, you should wrap all five sides of the 'box' that represents the closet sticking into the attic. I built a similar big cabinet in our MBA. Get paper-backed fiberglass insulation and wrap it around. Use sticks, like 1"x1" at the ends of the strip of insulation, screwed to something, to hold it there.

The door to the attic needs a seal of some kind. Maybe add another layer to the door that's bigger than the hole, so you can put foam gasket under it, and get some kind of catch that pulls it in hard.
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