I'm putting a wood burning stove right near a cinder block wall and it's on a stone slab. Nothing combustible around it. Can I put it right next to the wall since it's cinder block? And the flue pipe needs to go through the cinder block and scaling the wall. I have stainless steel spiral pipe as my exhaust, but I need to know if it needs to be double walled. Also considering putting tile onto the cinderblock behind the stove if that helps at all. Any and all help welcome!