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Change in Perspective To the Editor: Just a quick note to say thank you: This month’s issue was useful and on target. I am a subcontractor, and sometimes I don’t feel that every issue of JLC has something for me. Now I’m playing GC, building my own home, and suddenly every article speaks to me. Funny how a slight change in perspective can so greatly change your view. Michael Davis via e-mail Insulation Upgrade Worth the Cost To the Editor: Andy Shapiro’s summary (On the House, 7/01) of the diminishing returns from incremental increases in insulation R-value illustrates an important point. The analysis mentions that cellulose fills the cracks and gaps that typically occur in fiberglass insulation, but ignores the performance penalties