High-Density Fiberglass Batts vs Dense-Pack Dry-Blown Cellulose
I had no idea until I stumbled across a website last night discussing super-insulated residential construction that such a product as Owens Corning high-density fiberglass batts actually existed. I’d assumed that fiberglass in all of its forms was pretty much an antiquated material. I’d like to better understand the pros and cons of using high density fiberglass batts as an insulation component of an exterior wall (or cathedral ceiling) as opposed to a similar thickness of 3-1/2 lb dense-pack dry-blown cellulose.
What are the benefits of one over the other? In Passivhaus envelope construction, does one have a clear advantage? Is one likely to better retain its insulative properties over time? Are there any inherent red flags with either?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part