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homebuyer_2017 2018-01-01 04:09 PM

Garage snow accumulation on side concrete
5 Attachment(s)

We need some expert advise of our 1 month old house. We recently saw ice accumulation inside the garage concrete walls. Slowly its also reaching up to the drywall. We are concerned about this, picture attached here.

Also in the basement HRV, we noticed 'fresh air to inside pipe' accumulating ice/water build up around the pipe and dripping on the floor (pic attached).

Please advise if we need to bring this to builder's attention. Thank you!

TKG26 2018-01-01 06:39 PM

im not a builder but:
-the garage looks like a air leak possibly. Normally they seal with caulking along the drywall to make is air tight from home (exhaust gas from car needs to stay outside)

For the HRV at a bare minimum the intake duct should be insulated from the exterior to the connection on the hrv and the exhaust should also be insulated heading out to the exterior.. You have -25C air coming into the basement and that condensation is supposed to happen within the heat exchanger of the hrv where the water will collect and drain out the drain.

dvg 2018-01-01 06:46 PM

Is it an issue if I remove this insulation? I had to do so to reroute the duct in a tight space. What are potential issues?

TKG26 2018-01-01 07:42 PM

pictures above show you what happens when you remove the insulation.

homebuyer_2017 2018-01-01 08:28 PM

thanks! Is it normal to for the first year in any new construction to accumulate ice on garage concrete due to excess of moisture ?

Rottn 2018-01-03 06:51 PM

If the rest of the garage is insulated and you park a car in there it is actually fairly common when you get very cold temps. The car warms the air and the melted snow creates high humidity, which can condense and freeze on the uninsulated concrete.

The ducts going between the HRV and the inside of the house are usually not insulated. The dripping from the HRV is probably because the ouside air is so cold, that even after going through the heat exchanger it is still cold enough to cool the pipe below the dewpoint. Now some insulation on that duct could help, but you're better off to just not run the HRV when its more than a few degrees below -20 - at that point its just making your furnace and humidifier work much harder.

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