Storm collar not good enough

When thunder storm fronts arrive in my location, they come out of the SW and hit hard and heavy. On the approach of a thunder storm last week I went up into the attic to make sure all was well with the chimney pipe of my newly installed stove. I am guessing the initial wind was in the 40-50 mph range. I noticed small drips coming down the chimney pipe which stopped as the wind died down. So this heavy wind was driving rain under the storm collar and up the flashing. Water does go vertical! Wondering if this has happened to others? I fabricated a piece of sheet metal that goes from the roof to a few inches above the storm collar in a 180 degree ring facing the SW. Kind of hooky, but should block most of the wind from traveling up the flashing. I don't consider my fix permanent so looking for suggestions. Have looked at crickets, but they don't appear to be a wind fix. I applied two separate applications of high temperature chalk around the collar and 100% sure it isn't the problem.

 

I found that using a good quality silicone based sealer instead of high temp caulk worked better. Worked for me and solved the very same problem. I not only caulked the storm collar but also the roofjack.

Some of the high temp caulk drys hard and won't allow for any expansion.

 

Can you post pics?

The mfr. supplied storm collar usually has tighter fit. This is the second piece above the metal boot. It should be lowered until it contacts the boot then tightened. Some are with just a slot and tab then tensioned with pliers. Others had a machine screw that gets tightened. A bead of clear silicone is what I've used on replacements and repairs (I'm a roofer by trade) Clear sticks the best IME. Polyurethane caulk is another viable option. Doesn't come in clear but sticks and stays like no tomorrow.
I judge sealants by how hard they are to remove from my cuticles.

 

The storm collar isn't the source of the leak. The high wind was driving the rain under the collar and up the neck of the flashing. I purchased Duravent piping and accessories from the stove to the Chimney cap.

 

Another thing I don't like about the flashing system is it leaves a large gap around the chimney pipe for bugs to gain access into the attic. When I am finished with this burning season, I plan on stuffing the roof opening around the pipe with a towel to seal it off from critters. And leave a note inside the stove to remove it for next Winter.

 

I found 3M Aluminum tape that is good to 300 degrees. Thinking I could wrap the flashing neck and chimney pipe junction with it and eliminate the problem.

 

Found a few cases online where people were getting leaks from wind driven rain going underneath the storm collar. Some used metal screen and others Aluminum duct tape to block the rain. So it is a thing.

 

Doubling up storm collars (caulked) would be a cheap "hail Mary" attempt that seems to make sense.
All silicone caulking seems to be good for around 400* which should be more than enough with your class 3.

 

I wouldn't be sealing things off that are meant to be vented...they are that way for a reason...

 

X2

 

tripolymer sealant. aka geocell
silicone is such a pita, for one it doesn't apply over itself. Sorry return to your regular schedule, </end rant>

 

That’s what we use at work

 

I'm very biased toward OSI Quad caulking products...stuff works awesome...I've never heard of anyone that has tried it, that doesn't like it.
OSI® QUAD® MAX Clear Window, Door & Siding Sealant - 9 oz.

 

I have also used quad that stuff sticks to anything and doesn’t come off

 

Awesome stuff. Expensive as heck. And I remember when caulking was 12 oz tubes too.

 

Anybody ever used Thru the Roof? I like it.

 

Went out to eat over the weekend...we paid thru the roof!

 

Wrong place to post that Dave!!! Dad joke thread!

Bring a ladder in case the meal was on the house!

 

I’ve had wind blown rain leak past the storm collar. It happens. In my case it runs down the pipe and into the ceiling support box where it drips into the stove top. No sheetrock damage. I would not block the intentional air vents around the flue pipe at the top of the cone.

 

Against advice, I applied about two dozen over lapping pieces of high temperature aluminum tape onto the storm collar and flashing then a 360 degree final wrap. Nothing is touching the chimney pipe. I felt comfortable doing this since I noticed one of my wood stove customers was using this flashing. It doesn't provide any ventilation and touches the pipe. Had two heavy rounds of hard thunderstorms very early this morning and not a drop came down the chimney pipe in the attic.