Finish TradesQuestion 265 of 700
Batt insulation is installed in a 2x6 wall cavity behind drywall. To achieve its rated R-value, the batt must be:
a.Compressed tightly to fit any thickness
b.Left with large gaps around wiring for airflow
c.Installed at full loft, cut and fitted around obstructions without compression or voids
d.Stapled only at the very top so it hangs freely
Explanation
Insulation performs at its rated R-value only when installed to full thickness (loft) and carefully fitted around wiring, boxes, and pipes without compression or gaps. Compressing it lowers R-value, gaps create thermal bypass, and loose hanging leaves voids and sagging.
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