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-   -   Heading off roof rafters for chimney pipe. (http://www.diychatroom.com/f14/heading-off-roof-rafters-chimney-pipe-30778/)

jrcurto 10-28-2008 12:03 PM

Heading off roof rafters for chimney pipe.
 
I am assuming I can approach a roof opening for a chimney pipe installation as I would a skylight. I am up on the clearance and chimney requirements but I have to make room in the attic and roof to run it. This is Simpson Duravent 6" triple wall which has a 10" OD. The chimney will pass through the attic via the 14.5" support box but does not clear the ceiling joist and roof rafter above. This is a single story, corner installation from the den below, through the ceiling, about three feet of attic space and through the roof Can I just head these off and frame the opening as needed? Thanks, Jim.

Maintenance 6 10-29-2008 07:32 AM

You can cut them and head them off, but you should double up the rafters and joists on both ends of your new header.

Termite 10-29-2008 08:58 AM

Quote:

Originally Posted by Maintenance 6 (Post 178207)
You can cut them and head them off, but you should double up the rafters and joists on both ends of your new header.

Very true. Doubling the ajacent rafters is a very important step.

Also, use joist hangers on the cut rafter's attachment to the header.

jrcurto 10-29-2008 01:18 PM

Thanks guys, I am doubling up and proceeding on the rafters. Ceiling is done. I may be cutting in the ceiling support box later. Attic is chilly, snow flurries already today!

buletbob 10-29-2008 01:25 PM

Quote:

Originally Posted by thekctermite (Post 178237)
Very true. Doubling the ajacent rafters is a very important step.

Also, use joist hangers on the cut rafter's attachment to the header.

Agree! good advice


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