Which ever the two is the thickest or has the highest R-Insulation value.
what is a better insulator for a basement of a bungalow 3lbs polyurethane foam or 1/2 lbs icynenen insulation?
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Which ever the two is the thickest or has the highest R-Insulation value.
References :
The quality of the insulation is in R ratings, the higher the better.
The thicker the insulation the better it insulates. If you compact an insulation more than intended it looses R value.
Watching professionals insulate on DIY and HGTV.