Cultured stone behind stove and pipe

[Henk]

Hi, I'm in central Minnesota. I put in a Lopi double door wood stove with 8" pipe on a straight wall.
The stove pipe is 21" from the studs and straight up with proper through ceiling set up.
I'm think of putting up 1/2 " durra rock and 1 1/2 to 2 1/2" thick cultured stone, with a 3/8 to 1/2 " mud joint.

So after it's up, the stove pipe would be about 17 1/2" from the stone.
Does this fly with safety and codes and everything ? ( clearance to combustibles ? )
What are the actual rules ? ( So many on internet. Which is "RIGHT" )

Also, what alternatives to stone are there, with safety in mind ? Like metal, or brick. or ????
Maybe go that route.
Thanks very much.
Henk

 

[begreen]

The clearance for single wall pipe is 18" to the nearest combustible which should be the wall studs behind the Durock. If you want more protection, use double-wall stove pipe with 6" clearance.