Dear Carefree,
I use a Fibrament stone on my outdoor grill and can vouch for its
durability. I have no
connection with the company other than as a customer.
I use it to make bread all summer long for the very same reasons as you.
"Because no baking stone can be exposed directly to flame, FibraMent
for Grills includes a protective metal pan. FibraMent is placed in
the metal pan while it bakes your favorite pizza. FibraMent for
Grills is available in 13 5/8" and 15 1/2" round sizes to fit a
variety of barbecue grills." This is from their site.
http://www.bakingstone.com/grilling.php
I hope this helps.
Best,
Linda