See insulated chimney components available from Menards in zip file: File:Insulchim.zip.

Chris' Sketches for HabLab Chimney-through-roof Installation

Photo of HabLab with current stove and chimney setup:

Chris' original sketch sent to Marcin (basically identical to drawing Marcin later found that is posted at the bottom of this page):

Step-by-Step w/ Sketches

Locate place in ceiling to cut hole. Using a plumb-bob is a good way to ensure that hole in ceiling will be above chimney outlet from stove.
- One edge of this rectangular hole cut in the ceiling needs to lie along a rafter.
- Use the cathedral box to mark the size of the hole to cut.
- Edges of ceiling cut need to accurate but not perfect. Cathedral boxes typically come with a "finishing ring" or "trim ring" that is placed around the box and over the edge of the ceiling cut to make it look nice. If the hole is cut larger than this trim ring, the trim will not cover it, and there will be weeping and gnashing of teeth.
- Slide the cathedral box into the hole and make sure it fits.

Add 2x4 (or 2x whatever-you-have) blocking to create attachments on at least two sides of the cathedral box. If the rafter spacing is the same as the cathedral box, this is unnecessary. If the rafter spacing is larger than the box, then one side will have to get built out to create a second attachment surface.

I like to make the hole from the roof side much smaller, and also circular. Locating where exactly to cut this hole is a little tricker. Here's how I have done it.
- Eyeball where the chimney will penetrate through the roof and drill a hole through the roof large enough to begin cutting with metal shears.
- Install the cathedral box from the underside. This can be tricky. You have to slide the cathedral box up through the hole in the ceiling, hold it in place with one hand and then reach through the hole in the box with your other hand and screw it into the rafter that is along one side of it. Depending on the rafter