Cold frame protection
We finished up the new cold
frame today.
Two coats of paint and some
caulk where we connected the two windows should help it to go well into
the future.
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About us: Anna Hess and Mark Hamilton spent over a decade living self-sufficiently in the mountains of Virginia before moving north to start over from scratch in the foothills of Ohio. They've experimented with permaculture, no-till gardening, trailersteading, home-based microbusinesses and much more, writing about their adventures in both blogs and books.
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You could put place a layer of old bricks on the ground inside the frame and paint their top sides black. That would give you extra thermal mass and a surface that absorbs heat.
I'm undecided about whether one should put e.g. a layer of insulating foam under those bricks. It would help the bricks warm up faster, but it would also decouple their thermal mass from the earth.