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Old 11-29-2007, 01:42 PM   #1
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Adding stove top vent - cutting asbestos shingles


Hi there,

I need to run a duct from our stove top fan to the outside of the house. I have chosen to run this out the side of the house rather than the roof, since I'm more confident that I can obtain a better seal there.

The siding is 1x6 wood sheathing with asbestos shingles on the outside. Can anyone please recommend the best way to cut through these without shattering them? Should I remove the shingles first? If so, is there a tool that allows you to cut the nails under the shingles?

Thank you!

- J

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Old 11-29-2007, 02:05 PM   #2
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Adding stove top vent - cutting asbestos shingles


I am in process of gradually residing my house, which is asbestos shingles over original clapboard. For me, to remove shingles with minimal breakage (Broken asbestos shingles pose.... issues) involved a well sharpened bearclaw-style trim crowbar and a ton of patience. I tap the claw of the 10" bar under the nail, and then pull the nail out, taking care to go easy. If shingles were painted, paint likely got between shingles, gluing them togeather. A thin, flexible blade can catthem apart. To remove a specific shingle, take out nails in both shingles overlapping the target one, then you can take out target shingle nails, at which point you can take the shingle out.

To cut them, I used a carbide grit blade in a jigsaw - very little dust.

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Old 11-29-2007, 02:07 PM   #3
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Adding stove top vent - cutting asbestos shingles


Keep the cutting area a little damp to prevent dust. Wear a mask.

I've cut a dryer vent through this type of shingle with a hole saw, and it worked, but it destroyed the saw.
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Old 11-29-2007, 02:14 PM   #4
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Adding stove top vent - cutting asbestos shingles


many thanks for your reponses.

as far as stove top venting ducts go, what should I look for in terms of material? there is one already there, but it's flexible and foil-like, looks like a dryer vent. is there something I should look for to verify that this is the proper, fire-proof material?
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Old 11-29-2007, 02:18 PM   #5
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Adding stove top vent - cutting asbestos shingles


I thought you have to use the rigid metal duct for a range vent, not that spiral wire reinforced foil crap (which basically shouldn't be used for anything, except maybe a bath vent). If what you have is the heavier foil duct that can be bent to shape, but isn't floppy, then that might be ok. I'm not sure.
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Old 11-29-2007, 03:16 PM   #6
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Adding stove top vent - cutting asbestos shingles


Spiral metal duct even the best JM Flex-Met... should NOT be used .

This can be a fire hazzard as grease will be trapped. Duct needs to be smooth metal. This is code in most areas.
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Old 11-29-2007, 03:59 PM   #7
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Adding stove top vent - cutting asbestos shingles


okeedoke, I'll call my local code official.

thanks all

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