We have a winner! Actually this very much was a group effort.
Didn't the insulation question come after my summary of clues? If not, it was an innocent omission. I was sort of surprised that no one ever followed up on it as it was a rather distinctive discovery.
1) I am an unusual juxtaposition of categories for my type.
The Categories were Vegetable and Mineral, which is unusual for a book. They are usually all Vegetable (paper & cloth), or sometimes have an Animal (leather or vellum) component. The tricky dual use word here was "type" which meant the type on a printed page.2) David's clothing signifies. Faced with a choice, it breaks all ties!
David Letterman. A letterman jacket signifies that someone has "lettered". Something to get you thinking of printed material as well as leading you to the lettered asbestos Firestarter edition. There are two books which have an "asbestos edition". One, which is lettered, is Firestarter. The other one, which you can probably guess if you think about it, (Ray Bradbury's Fahrenheit 451) came in a numbered edition, and is the "mathematical one". David's other clothing, related to racing, is called a firesuit and should signify that you are fire resistant which was to help get you to asbestos as well.3a) Sprinkler systems may be employed to find me.
or alternately
3b) A woodpecker or shrike may be employed to find me.
You all figured this one out. Rainbird is a big sprinkler and irrigation system company. The character John Rainbird was tasked with tracking and capturing the title character and her father. As a bonus, a building sprinkler system might be used to discover and put out a fire.4) Royalty abounds; if you can see a match, then you've found me.
Titles. Stephen King. Royalties for book, movie, etc. Of course the "match" here is one where you are supposed to close the cover before striking. A definite fire starter.Here is an interesting eBay article on books and papers made from asbestos.
http://reviews.ebay.com/Asbestos-Books-and-Pages_W0QQugidZ10000000000895311