Spray foam insulation is an ideal solution, as there’s no empty space in the house’s walls where insects can get inside or make a nest. What’s more, spray foam insulation is not considered a food source, so there’s nothing for pests to chew on. Bugs can also contribute to poor indoor air quality and health.Click to see full answer. In this manner, do roaches eat insulation? Insulation can be good or bad. Aside from the obvious energy bill savings it provides, insulation can also help prevent against pests such as cockroaches, termites, millipedes and silverfish. Roaches are opportunistic omnivores, meaning they’ll eat anything that is organic and available.Subsequently, question is, does spray foam insulation keep bugs out? Spray Foam Insulation Once an insect finds these holes, they leave a road map to other insects, allowing them to enter anytime they please. The best way to keep insects out of your house for good is to spray foam in these areas, blocking their entrance. In respect to this, do cockroaches eat expanding foam? Expanding Foam: For larger gaps, you can use expanding foam. The other type is a polyurethane foam. The latter is more durable and it’s unlikely that cockroaches will be able to eat through it or use it as a food source.Will caulking keep roaches out?Insecticide will kill the roaches you have, but to keep them out for good, you’ll need to seal every crack in the kitchen and bathroom with 100 percent silicone caulk, which lasts up to twenty years. Some supers will do this for free; you can do it yourself with a caulking gun from the hardware store.