Can you? Sure, no law against it...but compared to what? not using it and leaving it lying around doing nothing? If so, use it...
But if you're just using it for its R value compared to some other kind of insulation, you could do better. But, it's better than nothing.
Go to roxul.com to find out more.
“The average American woman is about 25 pounds heavier than she was in 1960...Recognizing obesity as a disease will help change the way the medical community tackles this complex issue that affects approximately 1 in 3 Americans,”