Well, granite isn't flammable in the ordinary sense of the word. Of course,
most "granite" countertops aren't granite, they are "granitic" rock. Which
also isn't flammable in the ordinary sense of the word.
The man made ones with mineral particles - they also aren't flammable in the
ordinary sense of the word - hold the particles together with plastic,
acrylic often, and I'm guessing the plastic is flammable. Not much of it in
the material though.
The non-particle ones like Corian have a Class 1A flammability rating. They
are just *barely* in it, one more point less and they would be Class 2.
BTW, even though granite isn't going to burn it could melt in a house fire.
Its no longer cheap, but I use three quarter inch plywood for my
counter tops and seal them and use the nasty contact cement to adhere
the Formica or similar brand Laminate. Sealing the bottom edge and
rear surface of the back splash (if you use one) against moisture
before adhering it (to the counter) with something like 3M 5200 Marine
caulk should do the trick.
I've seen these old counter tops come out of a tear down after thirty
years and more with nary a bit of evidence of swelling.
But, consider finishing the "drip edge" which is the front of the
counter top protruding past the base cabinets with your best
waterproofing/sealing stuff esp about the area of the kitchen sink as
this is the most vulnerable area.
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