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Old 10-28-2008, 11:03 AM   #1
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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.

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Old 10-29-2008, 06:32 AM   #2
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Heading off roof rafters for chimney pipe.


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

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Old 10-29-2008, 07:58 AM   #3
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Heading off roof rafters for chimney pipe.


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Originally Posted by Maintenance 6 View Post
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.
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Old 10-29-2008, 12:18 PM   #4
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Heading off roof rafters for chimney pipe.


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!
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Old 10-29-2008, 12:25 PM   #5
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Heading off roof rafters for chimney pipe.


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Originally Posted by thekctermite View Post
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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