For instance, when comparing spray foam insulation R-value vs. fiberglass insulation R-value, spray foam typically has the higher average R-value per inch. If you aren’t sure which insulation ...

It has a higher R-value per inch of thickness. It’s also resistant to moisture and easy to work with. There are a few kinds ...

which has the highest R-value; extruded polystyrene (XPS), which is particularly moisture-resistant; and expanded polystyrene (EPS), which is often the cheapest. Cons: Foam board insulation can ...