Made some progress on the roof-brick SWC. Picked up a tube of "1000 uses silicone" and tried binding 5 pairs of bricks together (bottom + 4 walls). The resulting brick pairs have proven completely waterproof, and surprisingly strong. Should have no trouble holding up to the elements.
Dice, I hadn't considered that idea for an easy overflow hole, thanks! So far I've been using cheap steel masonry bits and a hammer drill to make 1" holes for a float valve and it's been slow going — even though the brick is only about 1/2" thick. Will definitely put your idea to use when assembling the SWC!
Pictures with assembly forthcoming, once I get the time to put the first box together. My seed starting date is in a month, I hope to get the first one out the door well before then.
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