My bottled beer is in a fridge in the garage, and the garage temp is about 28 F on a cheap thermometer. Still another day of arctic chill to come. Most of my beer is about 5 % ABV, and I remember reading that that is about the temp at which beer will freeze.
I fill the bottles with a bottle wand, and there is some variance in head space between bottles. Most bottles have at least an inch of head space. Is that enough head space to cope with expansion if the brew does freeze? I'd would want any broken bottles.
I opened the fridge about an hour ago and the beer was still liquid. At that time, I stuck the thermometer and a trouble light in there with a lit 100 watt incandescent bulb. I'll check the temp inside in two hours and see if the heat from the light bulb is enough to raise the temp.
If not, I'll probably bring the bottles inside the house, but I'm just curious to see if I need to do that.
I'd welcome comments and advice from anyone that has some experience or "war stories" with this. Thanks in advance for your help