Footer for some passive solar.
This was the last useable spot for the "extra" concrete. It's a footer about 12 X 4 and we'll set some windows into frames with a temperature operated fan to blow the hot air into the studio. We'll see how well it works but hey........ any added heat is a bonus.
When we got done pouring this the truck driver looked into the back of the cement truck and pronounced that there was less than a wheel barrow's worth of concrete left. And he gave me a thumbs up.
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