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FEBRUARY JLC 1997 In Defense of Foam To the Editor: I'd like to correct some misperceptions about foam insulation presented in a recent letter to the editor ("Dislikes Spray Foam Insulation," Letters, 12/96). The letter writer says cutting the foam flush with the stud faces will jeopardize the insulation on any Romex cable sticking out. Yes, if you're pretty careless. In practice, there just aren't that many places where Romex sticks out if the electrician has been careful (it's mostly tucked into junction boxes, which project 1/2 inch from the stud faces). It's really not hard to avoid nicking the insulation at the few places where the Romex does have to stick out without a junction box, though it's true this