Slightly pitched roof install

[Danielb33]

I will be installing my pellet stove before winter really rolls in. I will be doing it myself, I am just trying to figure out all that I need. The ceiling and roof it will be going through has about a 1/12 or 2/12 pitch. The roof is made of a rubber like material, not shingles. There is no attic space, only ceiling, insulation, roof. Think of it as a 3 season porch type room so there is probably 8" between the ceiling and roof. What exactly would I use for this. The cathedral ceiling support boxes look like they will not work. The ceiling isn't flat so I cant use the normal ceiling support. I am not set on any one brand either.

Thanks

 

[DAKSY]

You can cut the top of the ceiling support box to match the roof pitch on the underside of your roof sheathing
& frame a box between the ceiling joists to secure it to.
If you use a flat pitch roof flashing & you will be able to get enough of a "tilt" to adjust to the pellet vent pipe.
Add a storm collar & cap & you will be good to go.