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Chimney flashing rubber vs. metalhe c #6843941
04/15/20 11:32 PM
04/15/20 11:32 PM
Joined: Feb 2011
Posts: 331
Interior Alaska
3
30/06 Offline OP
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30/06  Offline OP
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Joined: Feb 2011
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Interior Alaska
I need to replace wood stove chimney at our cabin. Strong winds in November toppled a large spruce, and one of its branches knocked off our chimney right at the roof line. I've used a silicone-rubber-gasket type chimney flashing successfully in the past. However, friend of mine who's a small scale construction/remodeling contractor recommends the sheet metal type. Those have leaked a little for me in the past. The chimney is 6" inner diameter stainless double wall. Any thoughts?

Re: Chimney flashing rubber vs. metalhe c [Re: 30/06] #6843945
04/15/20 11:35 PM
04/15/20 11:35 PM
Joined: Nov 2017
Posts: 3,841
Maine, Aroostook
Posco Offline
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Maine, Aroostook
Is it leaking around a seam in the pipe itself or under the roofing material?

Re: Chimney flashing rubber vs. metalhe c [Re: 30/06] #6843951
04/15/20 11:52 PM
04/15/20 11:52 PM
Joined: Feb 2011
Posts: 331
Interior Alaska
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30/06 Offline OP
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30/06  Offline OP
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Interior Alaska
The leaking was in the distant past, but I think it was where snowmelt backed up under the flat part of the metal flashing. The current job at hand is replacing the chimney where it passes through a pitched metal roof.

Re: Chimney flashing rubber vs. metalhe c [Re: 30/06] #6843956
04/16/20 12:16 AM
04/16/20 12:16 AM
Joined: Nov 2017
Posts: 3,841
Maine, Aroostook
Posco Offline
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Posco  Offline
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I guess it depends of if you have shingles or metal. Being a bricklayer, I've built a lot of chimneys and I'd much rather deal with a shingled roof than one covered with metal. So much easier to get weathertight. Are you using a prefab through-the-roof type connector?

I have a prefab metalbestos chimney my coal stove is connected to. It vents through the wall. I used it only because I didn't have time to build an outside chimney.

Re: Chimney flashing rubber vs. metalhe c [Re: 30/06] #6843959
04/16/20 12:24 AM
04/16/20 12:24 AM
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Alaska and Washington State
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waggler Offline
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Alaska and Washington State
I was a little suspicious of the rubber or I guess maybe it's a type of neoprene; but over the past 17 years that I have been using the stuff on a couple of different cabins I've had better luck with it than I have in the past with sheet metal or lead flashing.


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Re: Chimney flashing rubber vs. metalhe c [Re: 30/06] #6843995
04/16/20 05:30 AM
04/16/20 05:30 AM
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vermontster Offline
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I would recommend a EPDM roof flashing and use all the screws your supposed to for installation. They contour to the shape of the metal roofing. I also install some 1 1/2Ē metal angel in a V shape above the flashing to help protect it from snow/ice damage.


The bitterness of poor quality last a lot longer than the sweetness of low price
Re: Chimney flashing rubber vs. metalhe c [Re: 30/06] #6844007
04/16/20 05:58 AM
04/16/20 05:58 AM
Joined: Mar 2014
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vermont
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vermont
Also remember not to over tighten the metal roofing screws on the rubber washers. Just tight enough to make the rubber washer have good contact with the metal roofing. You donít want to make the washer bulge or it will fail. I recommend using a cordless drill with torque settings. My buddy had a garage built last fall and the contractor put on the metal roofing with a impact driver. He called me and has the roof leaking every where to many to count. Good thing he hasnít finished off the inside yet. The metal roofing screws have to all be replaced.


The bitterness of poor quality last a lot longer than the sweetness of low price
Re: Chimney flashing rubber vs. metalhe c [Re: 30/06] #6844017
04/16/20 06:20 AM
04/16/20 06:20 AM
Joined: Jun 2016
Posts: 5,874
Michigan
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Trapper Dahlgren Offline
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Michigan
the most important, thing is snow guard , so snow don't slide an push against chimney

Re: Chimney flashing rubber vs. metalhe c [Re: 30/06] #6844446
04/16/20 12:39 PM
04/16/20 12:39 PM
Joined: Feb 2011
Posts: 331
Interior Alaska
3
30/06 Offline OP
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Interior Alaska
Thank you all. The rubber type flashing is a silicone based rubber and rated for the temp on outside of chimney. I think that's what I'm going to go with again. The pipe and chimney will be metalbestos type. Can't remember the brand. This is where part of my Corona virus stimulus check will go.

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