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MARCH JLC 1997 Termites and Foam To the Editor: In response to David Damroth's letter (12/96) about my article on frostprotected shallow foundations, here are a couple of details to consider for thwarting termites. The first detail (top sketch) is a bit of a thermal error in that it short-circuits the heat flow from the building, but it should still work against termites. Interior insulation (bottom sketch) may also be an answer, but again there would be some thermal short-circuiting. There has been no research on either detail that I know off, but they look feasible. Bill Eich Spirit Lake, Iowa Ice Dam Study Flawed? To the Editor: Ted Cushman's article on roof venting (Focus on Energy, 12/96) might give readers the false impression