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Old 08-31-2012, 05:59 PM   #1
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how do I seal this roof flashing around the pipe?


I have 11 inch piping going through this 8" flashing. I tried buying 10" inch flashing but it was too big in the diameter. I had to cut alittle bit as you can tell from the picture to get the pipe through. what would would be the best thing to use this to seal this?

I already have a storm collar to put over it once it is sealed. someone suggested I just need a storm collar but The water can still get in even with a storm collar.

From the picture I haven't install it yet. It is sitting on my carpet ready to install but I need something to seal it. I was thinking of using high temperature flue tape or foil tape.

Here is a link to what i want to use

Amazon.com: 3M 2113NA High Temperature Flue Tape, 15-Foot Roll: Home Improvement

Or should I just buy foil tape? Or should I use hi temp silicone sealant? Or do you suggest something else?
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Old 09-01-2012, 09:10 AM   #2
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how do I seal this roof flashing around the pipe?


This just stems form the "Doing it Right" attitude, but why not buy an 11" B Vent flashing, instead of jimmy-rigging an 8"?

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Old 09-01-2012, 09:26 AM   #3
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how do I seal this roof flashing around the pipe?


What is it your trying to vent?
Just wondering because it's rare to see a vent that big.
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Old 09-01-2012, 03:38 PM   #4
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how do I seal this roof flashing around the pipe?


fireplace .
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Old 09-01-2012, 04:42 PM   #5
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how do I seal this roof flashing around the pipe?


Is that single walled galvinized pipe?
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Old 09-01-2012, 06:00 PM   #6
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how do I seal this roof flashing around the pipe?


You can get the correct size ---call a roofing supply company or an HVAC supply house---that larger size may not be available at a big box store.
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Old 09-01-2012, 09:55 PM   #7
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how do I seal this roof flashing around the pipe?


yeah, get the right flashing from a furnace supply, and unless water starts to go uphill-only in a hurricane will the collar let water in.
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Old 09-02-2012, 08:38 AM   #8
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how do I seal this roof flashing around the pipe?


They don't carry the correct size. At ventingpipe.com they have at 12 inch 10 inch and 8 inch. I ordered one and had to ship it back. They don't carry 11 inch. They said they don't carry that size. Yes I had to take a 8 inch with a 10 inch diameter and cut it to make it work.

The storm collar I got fits it perfectly however I need to cover up the sides. Which I am just going to use high temperature flue tape.

Yes it is a double wall pipe.

My question is will the high temperature flue tape hold up in the outside weather?

Thanks
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Old 09-02-2012, 05:23 PM   #9
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how do I seal this roof flashing around the pipe?


I am unsure of what and why you are sealing this. The vent cap you have pictured is open at the top by design. It is a way for super heated air that will surround the vent pipe in the event of a long burning fire to escape. This is to remain open and then the storm collar will sit over it like a little hat. You should not see the vents when the collar is over it, but there needs to be a way for air to escape or you risk a structure fire. just slide the storm collar over it and I usually see the fireplace guys seal the top of the storm collar with OSI. Whether OSI is the approved product for this? I dont honestly know but that is what I see a LOT of fireplace companies use-I am just a roofer.
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Old 09-03-2012, 04:40 PM   #10
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how do I seal this roof flashing around the pipe?


Make your own storm collar if you have to. Slide it down and caulk around the storm collar.
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Old 09-05-2012, 08:48 AM   #11
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how do I seal this roof flashing around the pipe?


you need to buy a collar for it. that should do the job.

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