Armaflex vs. Kflex
Thanks for the responses so far.
Baldrick: The Armaflex/Kflex is pre-split and pre-glued. So you put it around the pipe, remove the celophane-like-material that protects the adhesive, and pinch the two halves together. And this is unconditioned space, the basement. I don't need the basement to be so warm, I'd rather have the heat preserved for the conditioned space upstairs.
Marty S: I know I would need fiberglass if it was steam pipes, but this is hot water (heating) pipes. The maximum they would get is about 160 degrees. Given that, do you still think fiberglass is a better way to go, and why?