I've been doing insulation contracting for 30 yrs. and I won't even price out any old house work unless the owners have addressed air infiltration first. As Pearlbluebird said, fiberglass insulation can't stop air infiltration, however it works just fine if the leakage is addressed first. Foam insulation is great in new construction but it's about 3X the cost of F-glass and often can't be used in retrofit work. Years ago, we would get call after call about pipes freezing during cold spells. Many of these were in new homes. Since air infiltration work has become routine we get very few, if any, calls. No other significant changes to account for this.
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Ain't as good as I once was, but I'm as good once as I ever was.
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