Blown-in insulation over fiberglass batts – GreenBuildingAdvisor

I seem to recall a very similar post very recently?

Personally, I’d probably do a quick job of fixing the batts just because of OCD. The blown material probably won’t work it’s way down into the gaps, especially small gaps, since it will get stuck on the sides and build up a blockage before the lower part of the gap fets filled.

From a practical sense, you probably won’t see a huge amount of thermal performance difference regardless, unless you have pretty large gaps. Note that I’m only talking about gaps on the SIDES of the batts, between the batts and the framing. Any depressions in the SURFACE of the batts are no problem, the blown fiberglass material will fill those depressions in without any trouble at all.

Bill