Hi,I have a customer who recently had condensation on an interior wall of an unheated detached garage. We replaced her roof last fall. We installed 6t of ice shield along the eaves, exceeding code…Continue
"Do not be fooled it is very common problem for cast iron wood working equipment to sweat and rust if keep in a unheated garages when the weather changes quickly from cold to warm and damp.
Now wet drywall is very strange. To me drywall does…"
"For condensation you need one simple condition. A surface below the dew point. There are lots of reasons, this isn't the exterior surfaces. They mostly boil down to paper surfaces and sun heating the exterior.
Increasing the ventilation will…"
"I agree with previous comments that the primary sources of moisture are the un-vented space heater and the slab. But there could be additional sources. It is not clear if this space is primarily a wood shop or a garage. A wood shop…"
"Did the builder actually insulate the wall properly? If air is moving through the O/H doors to an exterior ceiling or other penetration it could cause a low pressure in the garage, thereby lowering the temperature within the garage and subsequently…"
"It could be that the ridge vents themselves have caused an increase in humidity. Did you remove standard box vents when you installed the ridge vents? Do the ridge vents have a fabric bug screen?
I noticed in one of the photos that…"
"Was it in your scope of work to
A) install the ridge vent
B) to install the ridge vent and also cut back the existing insulation
Whether you should have noticed, identified and raised to the customer's attention the problem with the existing…"
Welcome to Home Energy Pros Forum. Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos, and upcoming events. If you're blogging about home performance, this is the place…"
"Pamela, Based on what you posted David Butler and David N have the best sources of drivers of moisture. My bet is 1st source of moisture was slab on the days below zero drawing warm ground moisture upwards, second moisture from propane heater, then…"
"I want to thank everyone for their responses.
I was finally able to inspect this garage myself. The insulation running up the rafters was covering the ridge vent cut that we installed. The garage door did not shut completely due…"
"We have seen many similar instances this winter in Maine when we had about 1 week of extreme cold (nights well below 0F and daily highs 0 to 10F in Jan) following rather warmer than average late fall early winter . Even subtle differences in…"
"David N makes a good point as sub-slab moisture could be the culprit for Michigan garage described in the original post. But in that case, the moisture would have been obvious on the slab before condensing on the wall.
@Pam, did the condensation…"
"David N, as mentioned this is a suspended concrete slab over a room below. So no, this is not a ground water issue, this is condensation occurring because the slab temp is below the dew point of the exterior air (the house is not yet heated)."
"I have actually been having this occur regularly this winter on my partially completed house. I do not have any garage door and the walls are not insulated. The floor is a 10" suspended concrete slab and I have had several days when…"
"Adding to what Sean said... although this could happen in any climate, I've never seen it. In addition to a quick transition from prolonged cold weather to mild, the moisture content in the air would also have to spike. A building can withstand…"
"My response is based on my assumption that there is fairly free exchange of air between the garage interior and the exterior. I was not able to follow your description.
For there to be condensation, it means the interior walls of the garage…"
Welcome to Home Energy Pros Forum. Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos, and upcoming events. If you're blogging about home performance, this is the place for you!