The cottage has a lot of heat stored in its 100,000 lbs of thermal mass. The fact that we’re getting icicles without much sun suggest we are losing some heat through our roof. Not too surprising since the cottage is only insulated with a single sheet of Reflectix foil-bubble-bubble-foil that got us through the past winter. We also only have single panes of glass in the big windows right now. I had hoped to get more insulation on by now but it has not happened yet. Still, the foil plus a layer of snow is doing a remarkable job of keeping the heat in the cottage. We’ve been having temperatures in the sub-zero to 20’s and very little sunshine yet the cottage is still staying 35°F above the outdoor temperature.
Curious as to how much heat we’re losing through the poorly insulated roof I put in several new temperature probes. Now I have the following probes:
- Farm House
- Tiny Cottage eye level
- Tiny Cottage Floor
- Tiny Cottage Ceiling – 1/2″ into the roof concrete with spray foam below it to seal it and protect it from heat from the room.
- Tiny Cottage Roof Below Foil – 1″ above ceiling probe on the roof top above the concrete and below the foil.
- Tiny Cottage Roof Above Foil – under the insulating blanket of snow.
Lots of data. When we can we will add more insulation to the roof. In the mean time it will be interesting to watch these probes. Interestingly, the foot of snow on the roof makes a significant blanket of insulation. Our tiny cottage is an igloo. Thatching the roof would help too…
Sunday Outdoors: 20°F/-8°F 12″ Snow
Farm House: 54°F/42°F
Tiny Cottage Eye Level: 34°F/31°F Sump in place, loft ladder built
Floor: 31°F/30°F (water not actually freezing on floor)
Roof Below Foil: 30°F/29°F
Roof Above Foil: 28°F/27°F