Since fiber glass blankets compress so easily, can I increase the effectiveness of my insulation by squeezing a 5 1/2″, R-21 blanket into a 2 x 4 wall instead of using 3 1/2″, R-15 blankets?
No. Compressing fiber glass blanket insulation into a smaller wall space will not necessarily increase your insulation’s efficiency. Fiber glass insulation works on the principle of trapped air pockets. By compressing fiber glass insulation, you decrease the amount of air trapped in the material. For example, compressing R-19 into a 2×4 wall will give you an R-13 value. It would be better to buy the product that best fits in the space. R-13 or R-15 batts are the best products for a 2×4 wall. To see a general compression chart, click here.
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