Are R Values Additive for Blown in Fiberglass Insulation Layers
I remember staring up at the attic insulation, a fluffy, beige mess after a DIY attempt to top up the R-value. I’d thrown on another layer of blown-in fiberglass, figuring more is always better, right? Well, the heating bill didn’t exactly drop like a rock. It got me wondering: are r values additive for blown … Read more