Im working on building my corner bass traps. Looking at the Thermafiber available at local hardware store. Is this product going to work? From some research Ive done people are discussing density. I dont need some crazy perfect sounding room, but I want the room acoustics to improve on the low end. I also dont want to waste time and money building bass traps only to find they are not effective.
R numbers mean absolutely nothing when it comes to sound. You need to be concerned with NRC (Noise Reduction Coefficient) and STC (Sound Transmission Coefficient). These specs are always shown on the manufacturer's website and are absolutely necessary for determining the sound deadening characteristics of a building material.
When you see NRC of .3 or whatever is shown, it means that the material absorbs 30% of the sound at that frequency. Nothing is as efficient in the low end as it is in the midbass-high frequencies, so that means you'll need more area and volume in order to treat those frequencies to the extent needed.
You DO NOT need to cover the walls & ceilings completely and if you do, it will be a terrible experience.
Owens-Corning rigid panels are great, but they do shed some fibers- if that concerns you, maybe something like Roxul or the one you're already looking at.
If you don't know how to determine the amount and type of absorption you need, hold off doing it until you learn- it will be worth the wait because you're less likely to become extremely frustrated.
FWIW, I used Owens Corning panels in 1", 2" and 4" thicknesses, mostly 2' x 4' and a few that are 1' x 4'- I had made them for a theater I was working on to help someone else in the business and as it turned out, they weren't needed, so I kept them. When I found that my room had problems that couldn't be solved by repositioning speakers, furniture, etc, I brought the panels in and used REW to watch the response as I positioned the panels. They did the job and I haven't felt the need to make any changes since. For the record, I took a college level class in Acoustics and did a lot of reading over the 45 years I have been in the business, as well as many discussions with people who know more than I do about the subject.
You can contact acoustical material manufacturers and dealers for help, too- GIK is one of them.