Usually, the forms for a foundation wall are made using wooden forms, but we used quad-lock ICFs (insulated concrete forms). They're made of styrofoam and look a lot like Legos. Whereas wooden forms are removed (and reused) after the cement wall is poured and hardens, the quad-lock forms stay in place and serve as insulation (unlike most homes, our crawl space is insulated).
Dale and Les are shown here making sure that the top of the forms are level.
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