Foam board insulation: EPS, XPS and polyiso compared, where to use them and how to install
Rigid foam board insulation explained: EPS, XPS and polyiso, R-value per inch and moisture, where each works best, sealing seams and fire safety.
Home insulation
How much attic insulation do I need? Recommended R-values by climate zone
ENERGY STAR's recommended attic, floor and wall insulation R-values by climate zone, how to check what you have, and how to turn an R-value into a thickness.