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Fear of callbacks and lawsuits keeps contractors from experimenting with every new building product that comes down the pike. But foam concrete-forming systems are making headway against this conservatism. These "stay in place" systems use proven materials like rigid foam insulation and concrete to form and insulate structural concrete walls in one step. In this article, three experienced builders describe the on-site techniques they've developed to use these new forming systems. KEEVA WALL: Insulated concrete post-and-beam by Tony Bowler, Hageman, Idaho If you can imagine building a wall out of giant Legos shaped from expanded polystyrene (EPS), then you already understand the principle behind the Keeva form system. Each 4- foot-long Keeva block measures