It’s time to make the switch. You’ve been won over by foam’s ability to create an air seal that’s going to keep your home’s temperature firmly in your control and its many other benefits. But you’ve got some skeletons in your closet, well more like old insulation in your home. It’s got you wondering as to the best way to proceed. You’re probably asking yourself do I need to remove old insulation before installing new?
Like most things, different situations have different answers. Any space where you’re going to put spray foam like your attic, crawl space, or rim joist, is going to need to be completely emptied of old insulation. Your contractor will want to pull out that old cellulose or fiberglass so the foam can get right up against the outer layer of your house. That’s going to create the air seal that you want. Without that air seal, your furnace or air conditioning unit is going to run longer and harder, and that’s going to show up in higher energy bills.
Thankfully getting that old insulation out is only hard when you have to do it yourself as most insulation contractors should do this dirty work for you. They’ll vacuum it up if its blown insulation or carry out any fiberglass batts and dispose of it so you don’t have to.
When it comes to injection foam, like RetroFoam, it’s often not a problem to have some old insulation in your walls. With fiberglass, it’s not going to stop the foam from filling the space like it needs to. However, cellulose in your walls may be a different story. If the cellulose is broken or beaten down it won’t be an issue as the foam will just fill right over it. Otherwise, your contractor will have to tread carefully and possibly try to remove some of the cellulose before the foam is injected.
The saying goes “out with the old and in with the new” and that’s usually true for insulation. But it should be a relatively headache free situation with a good foam insulation contractor. The benefits are waiting for you on the other side so talk to an estimator today!