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I’ve been doing some insulation work and the quality of other people’s work is amazing. I don’t know if the previous worker just didn’t know how to install fiberglass batt insulation or if he was just lazy and wanted to move to the next job.
In order for insulation to reach its full advertised R value, it must be installed correctly. Actually, it must be installed perfectly. The batt must not be compressed, rounded, or laying on top of things like cables or pipes. It must be in direct and full contact with the drywall ceiling below it.
I went through an attic and concentrated on a vaulted ceiling. This room was the warmest in the house in summer, and coldest in the winter. And for good reason. The batt insulation was hardly even touching the drywall. In fact, the batts were just sitting on top of the ceiling joists with just the center touching the drywall ceiling. This is rounding and the picture above shows this condition. The full face of the batt needs to be squarely installed so that it sits nicely in the middle of the joists. With the rounding I saw, although the batt had an R value of 30 printed right on it, it probably was performing at around an R-4 or so.
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