building my own hearth pad--question about using marble

[krondalou]

I have 1" thick marble slabs 9.5" wide and 48" long---My hearth pad is cut to 30"x48", and am going to cut the marble accordingly. Question is about what size trowel notches should I use/how thick should my thinset be? And any good reason not to use marble? Also, should I reinforce the subfloor from the crawl space? I put 1/4" cement board on the 1/2" plywood subfloor. My stove is 310 pounds.

 

[bholler]

I have 1" thick marble slabs 9.5" wide and 48" long---My hearth pad is cut to 30"x48", and am going to cut the marble accordingly. Question is about what size trowel notches should I use/how thick should my thinset be? And any good reason not to use marble? Also, should I reinforce the subfloor from the crawl space? I put 1/4" cement board on the 1/2" plywood subfloor. My stove is 310 pounds.

What insulation value is required by your stove?

 

[begreen]

The hearth construction sounds similar to what is recommended for the Survival Navaho model. Is that what you are following?

 

[Zack R]

I have 1" thick marble slabs 9.5" wide and 48" long---My hearth pad is cut to 30"x48", and am going to cut the marble accordingly. Question is about what size trowel notches should I use/how thick should my thinset be? And any good reason not to use marble? Also, should I reinforce the subfloor from the crawl space? I put 1/4" cement board on the 1/2" plywood subfloor. My stove is 310 pounds.

I'd start by looking at the stove requirements (in the installation manual) and then working backward from there.