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guitar548 08-31-2012 05:59 PM

how do I seal this roof flashing around the pipe?
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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 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?

bcdemon 09-01-2012 09:10 AM

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

joecaption 09-01-2012 09:26 AM

What is it your trying to vent?
Just wondering because it's rare to see a vent that big.

Fix'n it 09-01-2012 03:38 PM

fireplace .

joecaption 09-01-2012 04:42 PM

Is that single walled galvinized pipe?

oh'mike 09-01-2012 06:00 PM

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.

RJM Build 09-01-2012 09:55 PM

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.

guitar548 09-02-2012 08:38 AM

They don't carry the correct size. At 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?


RJM Build 09-02-2012 05:23 PM

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.

tinner666 09-03-2012 04:40 PM

Make your own storm collar if you have to. Slide it down and caulk around the storm collar.

hotrod351 09-05-2012 08:48 AM

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

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