So if you are looking for a strong insulation, a closed-cell spray foam is what you want to grab. As for smaller fill-ins, an open-cell foam will do just fine. The post The Difference Between Open ...

Here is everything you need to know about DIY spray foam insulation. Closed cell spray foam density is measured by weight. For example, a 12-in. square box filled with 2-lb. density foam (fully ...

Knowing what sort of insulation to use and ... to-fill nooks and crannies. The open-cell option has an R-value comparable to fiberglass, but closed-cell foam is denser, more rigid, and more ...

In his guide, he details the difference between XPS (expanded polystyrene) and EPS (extruded polystyrene) and how each product’s closed cell and open cell nature affects the final board.