Workshop Ventilation

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Forum topic by Lambertwoodworks posted 10-31-2013 04:54 PM 1025 views 0 times favorited 1 reply Add to Favorites Watch
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6 posts in 1670 days

10-31-2013 04:54 PM

Topic tags/keywords: question workshop insulation ventilation moisture tool protection

Hello, this is my first post on any forum. I’ve read these forums over the past years. I’ve gained some good information and would appreciate a little more with this subject. Usually, I’d look the information up online, but I want to take this opportunity to finally make a mark in a forum. I live in the mountains of NC and my shop sits right along the start of the main slope to the ridge of a mountain. The area receives little sun. The original owner of the house built, what I now use as a shop, as his temporary home to build the main house. After purchase of the home and some renovation of the shop space, I noticed a strong mildew odor. The base cabinets had a yellowish type mildew covering the surface. The cabinets were quickly pulled out and tossed. The exterior siding looked good when I purchased the home, but after a year of heavy rain the lower portion of the siding shows signs of moisture damage. Everywhere I look, I can find small amounts of the yellowish mildew; ceiling joists, behind cabinets, etc. There are no ridge vents or any type of venting on the soffit. The attic does not have any insulation and the roof will need to be replaced in a few years. The building is structurally sound, but the moisture is at a constant battle with me and my tools. A majority of the walls were not insulated or drywalled, but I completely caulked all seams/joints, then insulated and installed the drywall. Almost everything in the shop has been scrubbed with lightly diluted bleach. Moisture and temperature in the mountains fluctuate rapidly. The property always seems to be very moist on a regular basis. One of my children left a baseball glove outside for a week. After a week, the glove was covered in mildew; ruined.

Would it help to seal the concrete flooring? I have the materials to complete this job, but it requires movement of a fully equipped shop and it is already reaching 30 degrees at night here.
Will ridge vents help with the mildew? Will I need soffit vents or gable type vents (Both)? Note that I want to use the attic space for other equipment I own.

I am unsure if it would help to ventilate the space since there is constantly a large amount of moisture outside. I don’t want to triple the moisture in the shop by adding vents. During the warmer months, a fan and a dehumidifier run constantly. I already plan to replace the lower portion of the exterior siding and will be adding interior paneling over the drywall.


-- LW

1 reply so far

View b2rtch's profile


4861 posts in 3042 days

#1 posted 10-31-2013 06:01 PM

First be very welcome on LJ, we are glad to have you around.
Well it seems that you have quite an issue on your hands.
Where I live (Utah) it is always too dry.
I used to live in Africa where it was humid that mushrooms grew on our clothes in the cabinets.
We had light bulbs burning 24/day to keep the things dry.
I also lived in Portland Oregon where it was so wet that we had mushrooms growing inside our siding.

I understand your concern about ventilating and bringing more moisture in.
I wonder if you find a dehumidifier similar to air conditioning unit which would dry the air as you suck it in your shop.
Something like this:

For the humidity outside I do not think that there is any solution

-- Bert

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