Is spray foam worth it or should I just add blown-in insulation to my attic?
For most attics, sealing the gaps and topping up blown-in insulation is the better value, because foam costs more and the big thing it adds is the sealing we'd do anyway. Foam earns its price when your ductwork runs through the attic or crawl space, since it seals and insulates around it in one pass. I'll tell you which one your house needs, even when it's the cheaper one.





