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Foam Forms Speed Curing To the Editor: "Foam Foundation Forms" (12/93) was an excellent article and answered many questions raised by one of my current projects. I have just one minor clarification regarding curing. Insulation does not cause concrete to cure at a slower rate as the article states. In fact, because the foam insulation traps the heat of hydration, the concrete cures faster and more importantly, retains moisture to cure longer, resulting in (as stated) greater strength. Robert Randall, P.E. Mohegan Lake, N.Y. Cost-Plus Query To the Editor: I enjoyed your article on cost-plus contracts ("Working Cost-Plus," 9/93), but I felt unclear about the "guaranteed maximum cost" part of the article. Where does this figure come from? Since the owner will want