Went to trim out a new construction job today. Start seeing all kinds of orange expandable foam insulation hanging out from recessed housings, bath exhaust fans, and ceiling outlet boxes. Get to looking and find that the Co. that did the insulation felt it was necessary to spray foam around any opening that was in the attic. The product that they used actually distorted the cylinder Dia of the cans and the square openings of the fans. Some of the fans which should have a 8.5 inch square opening are actually as small as 8.25. Virtually impossible to install the motor asembly which usually fits tight just with the drywallers distortion.The kicker is that the same Co. shot 18" of cellulose in the attic as well. I would surely think that anything under 18" of cover would not need additional insulating with the foam product. Why do most people feel that more is always better!