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Old 11-05-2007, 06:40 AM   #1
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Chimney Flue Hole


We are preparing to put a Class A Chimney Flue through our metal roof (4/12 pitch) which also has OSB sheathing on 16 inch center scissor trusses. We are considering triple wall which we understand can be installed 2 inches from combustibles. We'll need to put the pipe through the small attic area (24 inches high). Has anyone lined that flue space with Durock? Or how have you addressed the issue?

Any suggestions on cutting the hole in the roof? Round? Square? What tool?

And what is the best high temperature flashing to use?

Thanks!
Liz

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Old 11-07-2007, 05:36 AM   #2
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Chimney Flue Hole


We are preparing to put a Class A Chimney Flue through our metal roof (4/12 pitch) which also has OSB sheathing on 16 inch center scissor trusses. We are considering triple wall which we understand can be installed 2 inches from combustibles.
That's fine.

Has anyone lined that flue space with Durock? Or how have you addressed the issue?

No need to worry about that space.

Any suggestions on cutting the hole in the roof? Round? Square? What tool?

Round, about 2" larger than the pipe.

And what is the best high temperature flashing to use?
The metal collar is fire-proof.

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Old 11-08-2007, 08:22 AM   #3
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Chimney Flue Hole


Thanks, Albert!
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Old 11-10-2007, 08:54 PM   #4
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Chimney Flue Hole


franks exactly right
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Old 11-11-2007, 08:25 AM   #5
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Thanks, Frank... and Roofing God!
Do you think a saws-all is the way to get the hole in the metal roof?
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Old 11-11-2007, 09:03 AM   #6
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Yeah Use A Bi-metal Blade
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Old 11-11-2007, 09:18 AM   #7
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Chimney Flue Hole


Do a search for "Triple Wall" and read what I said about Triple Wall on a previous post.

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Old 11-11-2007, 09:31 AM   #8
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A "triple wall" fireguy search leads me back to this post... ???
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Old 11-13-2007, 07:08 AM   #9
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So I called a place that sells chimney pipe and he says double wall pipe is a better product than triple wall because it has insulation in it. And 2 inches of clearance to combustibles is what is needed. He also says they have boxes that go around the pipe through the attic... anybody have experience with this?
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Old 11-13-2007, 08:57 AM   #10
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yougot it covered,do it already
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Old 11-13-2007, 11:13 AM   #11
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Chimney Flue Hole


The "Boxes" are called chimney housings or chimney surrounds.

Hart and Cooley recently stopped manufacturing their versio, which I have used for years.

Other alternatives are Majestic and Air Jet.

Majestic is already pre-assembled and the slight extra cost is worth the reduced hassle of assembling the panels together for the four sides.

Ed
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Old 11-13-2007, 04:18 PM   #12
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Thanks, guys!

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