Condensation, Cold and Mold

With the beginning of the New Year Talkeetna and its immediate environs have seen a switch from above normal temps to those which even the locals would find a bit on the ‘cool’ side. Yesterday (01/03) we never reached 4.0 F (-15.6 C) and just at sunrise this morning – which occurred at 10:24 AKST or 19:24 UTC – we bottomed out at -8.3 F (-22.4 C). As a broad generalization Talkeetna ‘expects’ to see high temps around 19.2 F (-7.1 C) and lows around 0.9 F (-17.3 C). Based on this you can see we’re a bit on the cool side although for me it just feels great! Anana and Qanuk cannot get enough of these temps although I have to time Qanuk’s exposure as when it’s 0 F (-17.8 C) to -10 F (-12.2 C) he should have no more than 40 minutes of exposure as even his tough GSD pads will begin to crack and bleed. One of the local mushers gave me a tip on some cream and thus far it seems to be really helping the poor boy but I still must be wary when the air temp is below zero.

One of the less pleasant issues with which I’ve had to grapple involves the build-up of condensation on the interior of the windows when the temps do drop below 25 F (-3.9 C). Understand my place has double pane glass in all the windows and this does a reasonable job of insulation; without question I really need triple pane glass and I’m looking into options to make this happen. But once I see outdoor temps drop much below 25 F (-3.9 C) the condensation really does begin to accumulate. As I have wooden window frames having water pool on the frames for any period of time is not good! I have played around with numerous methods in an attempt to decrease this condensation with very little luck. I have an inquiry into UAF (University of Alaska Fairbanks) which has a world renown department on building insulation regarding any suggestions. For now I’m reduced to using a sponge on a daily basis to try to manage the moisture. I’ve also tried laying out strip of highly absorbent material along the glass/window frame interface; this works but requires the material be wrung out every day. In addition when it is below zero the material gets trapped on the windows frame by ice and cannot be removed.

But the buildup of condensation has another negative consequence which can be even more destructive in the short term; mold quickly grows on the spots where the condensation pools. Because of the extremely low angle of the sun this time of year the naturally anti-microbial properties of sunlight cannot hit the corners of the windows where the mold loves to grow. And this stuff must be ‘Alaskan mold’ as it thrives at temps right down to 32 F (0 C) and can withstand being frozen in water for weeks yet still emerge viable once the ice melts. The stuff is the classic ‘green/black’ mold which I immediately associate with Rhizopus nigrificans; however, this stuff is definitely a psychrotroph and R. nigrificans is not so my next guess is some form of Aspergillius. If I had access to my old micro lab from 30 years back I could ID the beggar within a week. I am planning to see if API test strips can be purchased for ID’ing molds; if so I’ll be getting some. Anyway, whatever the stuff is it has no issue growing stoutly at freezing temps and hence it spreads out even in the cold. I’m trying a 20% chlorine to 80% water solution in spray form but thus far this hasn’t been effective; next step is to increase it to a 50% solution.

Having come from the lower 48 I was much more aware of trying to keep moisture in the air during the winters; this was caused by the prevalence of forced air heating. As the standard in Alaska is fuel oil via a Toyo stove or wood stove the air doesn’t get a chance to dry out like that run through a gas furnace and hence retains a much higher relative humidity. I remain impressed to this day as to the amazing differences I’ve encountered in such seemingly simple things like interior humidification and condensation formation when comparing the lower 48 to Alaska. Without question things are ‘different up here’ and I continue to learn just how different they can be! The following are some images pertinent to this posting:

Icy window glass with mold in the corner; outside air temp -7.7 F

Icy window glass with mold in the corner; outside air temp -7.7 F

The yellow is a highly absorbent felt like material which has become frozen to the window; outside air temp -7.7 F

The yellow is a highly absorbent felt-like material which has become frozen to the window; outside air temp -7.7 F

Just rising sun illuminates a south facing window and highlights the amount of condensation followed by ice at the edges; outside air temp -7.7 F

Just rising sun illuminates a south facing window and highlights the amount of condensation followed by ice at the edges; outside air temp -7.7 F

The result of closing off the NE bedroom on the second floor and an outside temp that never reach 0 F for two days and dropped to -23 F at night.  The ice in the corner was 0.6 inches (15.24 mm) thick!

The result of closing off the NE bedroom on the second floor and an outside temp that never reach 0 F for two days and dropped to -23 F at night. The ice in the corner was 0.6 inches (15.24 mm) thick!

4 thoughts on “Condensation, Cold and Mold

  1. Cathy Crowder

    Plain white vinegar can also help to kill molds I you don’t mind the aromas of that compared to a bleach solution. 🙂

    • Happy New Year Cathy! I should’ve mentioned I’ve tried both acetic acid and even a weak solution of nitric acid; the damn mold just shrugged it off. But I think maybe a dilute solution of sulfuric acid might do the trick but I have to be careful to not mark the wood in the process. Thanks for following and especially thanks for the tip!

  2. When acetic acid doesn’t work I say get out the butane lighters and burn it…..”You’ll love the smell of burning mold……it smells like victory!”

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