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Old 01-02-2011, 07:03 PM   #16
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Frost on joints in garage


Looks like its time to move the drier vent to an outside wall.

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Old 01-02-2011, 10:13 PM   #17
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Frost on joints in garage


At 45% relative humidity outside in Calgary, the outside air contains very little moisture in comparison to a warmer place like 45% relative humidity in Toronto since the air temperature is higher and the air can hold more moisture in Toronto.

You know when it is cold when you get a cloud of mist when the cold, dry outside air comes in and meets the interior air at the same relative humidity. THE DEW POINT IS A MORE REALISTIC WAY TO MEASURE THE AMOUNT OF MOISTURE IN THE AIR. I had problem at my lake home when I pulled my cold car into an attached, unheated garage, but it still fogged/frosted before I knew where to stop when it was -30F outside.

Humidity, condensation and fogging/frosting just take time to fully understand and it can be confusing and conditions are always changing by the hour or day.
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Old 01-04-2011, 11:54 PM   #18
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Frost on joints in garage


Our garage started with frost accumulation on all drywall screws, door handles and locks. The windows get completely frosted over. We just received a new roof a couple of months ago and it didn't do this before. anybody know what might be the cause? It is insulated and drywalled too. Only moisture comes from our vehicles, but is that enough? Our frost is not nearly as much as the other gentleman, but it's enough.
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Old 01-05-2011, 01:18 AM   #19
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Frost on joints in garage


Thanks everyone. I think we're going to install an exhaust fan with a timer and see how that goes.

As for the frost amount - the flash does exaggerate it a bit.. but not by much. The door lock and handles and hinges are the worst.
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Old 01-05-2011, 05:55 AM   #20
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Frost on joints in garage


I wonder if the vapor barrier was left out when they poured the slab. Could be moist air moving through the slab.

Might want to paint the floor in oil based paint or epoxy
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Old 01-31-2011, 09:53 PM   #21
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Frost on joints in garage


Well I installed a fan with a humidity switch and it seems to be working, but there is still some buildup in areas. Not as much, the fan is helping, but probably not to full expectation. Might need to put a small heater in there to heat it up just above freezing when it's very cold.
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Old 02-01-2011, 08:07 PM   #22
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Frost on joints in garage


My guess is excass humidity from the cars bringing in snow on the inside. Thermal bridging causing the moisture to condense and freeze on these cold spots. Are your walls 2X4 or 2X6. I'm guessing 2X4. It could also be a very bad insulation job. Attic access should be code. In Vancouver many homes have permanetly "on" bathroom fans to remove the excess moisture in the winter. Some heat in there would help
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Old 02-03-2011, 12:19 AM   #23
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Frost on joints in garage


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Originally Posted by masterofall View Post
My guess is excass humidity from the cars bringing in snow on the inside. Thermal bridging causing the moisture to condense and freeze on these cold spots. Are your walls 2X4 or 2X6. I'm guessing 2X4. It could also be a very bad insulation job. Attic access should be code. In Vancouver many homes have permanetly "on" bathroom fans to remove the excess moisture in the winter. Some heat in there would help

Thanks yeah, I think I may have to heat it a bit, but the fan is helping with 90% of the ice. Of course it wasn't around -30 for a couple of weeks this time, just a couple of days. 2x4 walls i think, insulated with fibreglass pink, attic has R20 fibreglass pink. vapour barrier on walls and ceiling. tar paper on outside walls under siding.
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Old 02-23-2011, 06:57 PM   #24
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Frost on joints in garage


Miko I have the same problem, not quite as bad as your pictures show, but frosty just the same. I'm out in Airdrie so pretty much the same weather. Who built your garage for you? I haven't checked for the house wrap yet, wanted to wait for the warmer weather, but I'm thinking my builder took a short cut and didn't wrap the garage
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Old 02-23-2011, 11:48 PM   #25
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Miko I have the same problem, not quite as bad as your pictures show, but frosty just the same. I'm out in Airdrie so pretty much the same weather. Who built your garage for you? I haven't checked for the house wrap yet, wanted to wait for the warmer weather, but I'm thinking my builder took a short cut and didn't wrap the garage
Hi, not sure who did, it was built a few years after the house was.

Go to Home Depot and get that $150 bathroom fan with the humidity sensor so it runs when it needs to. It's 100 sones and barely audible so it won't bug the neighbours.

It will get rid of about 90% of the problem but I am still waiting for a week below -30. Since the recent cold snaps though the frost is no existent except the odd spot here and there. Buddy said I might need to heat the garage to around 5c if there's a long deep cold snap.
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Old 02-26-2011, 11:35 PM   #26
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Frost on joints in garage


The studs are acting as thermal bridges, being colder than the wall cavities, the moisture is condensing on the drywall directly over them; pp.10; http://docs.google.com/viewer?a=v&q=...BiEiG1lHFDd9yA

Notice the mass where the door header is because 3-1/2” solid wood has a R-value of 4-1/2-, while the cavity is R-11; http://www.coloradoenergy.org/procor...f/r-values.htm

Ventilate. Or install rigid foam board, then drywall on the studs to break the bridge, as said.

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Old 03-01-2011, 12:08 PM   #27
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Frost on joints in garage


I was doing some drywall finishing in a buddys garage that had the same problems. I found out that he had blown in insulation in the attic and the dust had blocked the screen on the ridge vent. You had mentioned that the roof vents were covered in snow. I would give that a serious look. Good Luck and its almost SPRING

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