New construction. Snow drifts up under the storm collar into the top of the roof jack around my chimney pipe. What material can I use around the roof jack to keep snow from blowing up under the storm collar and dripping into my living space?

The Roof Jack is not a tight fit from the manufacturer. It has 4 bent points which keeps the chimney pipe centered. The roof jack is made for chimney pipes 6 to 8 " diameter. Mine is a 6" so it has a manufactured gap. I need to seal that gap and keep drifting snow from blowing up under the storm collar into the roof jack. What can I seal that gap with and still meet fire code? The storm collar works great for rain but fails the blowing / drifting snow test.

High temp rtv. but first make sure this is not for freash air if you can take pic. that would help us

If this is in a mobile home or manufactured home do not caulk with out supplying pictures and the exact model of furnace and roof jack part number. This can cause problems.

New construction. Snow drifts up under the storm collar into the top of the roof jack around my chimney pipe. What material can I use around the roof jack to keep snow from blowing up under the storm collar and dripping into my living space?

The Roof Jack is not a tight fit from the manufacturer. It has 4 bent points which keeps the chimney pipe centered. The roof jack is made for chimney pipes 6 to 8 " diameter. Mine is a 6" so it has a manufactured gap. I need to seal that gap and keep drifting snow from blowing up under the storm collar into the roof jack. What can I seal that gap with and still meet fire code? The storm collar works great for rain but fails the blowing / drifting snow test.

I've attached a jpg from the outside taken last fall after installation. The roof jack has a closure under the bottom and it was installed with rain in mind not drifting snow. I've got some rework to do. Thanks for your reponses

Looks good now if you can only get the snow thing under control.

Where exactly is it leaking? Is it where the flashing is held up by the roof seams?

The roof jack is sealed on all four edges to the roof panel(s). The only open area is between the storm collar and the top of the roof jack. the roof jack is made to accomodate 6" or 8" pipe. Mine is a 6" so there's a 1" gap around the top of the roof jack with only four contact points for the 6" pipe. The Chimney pipe has a separate support bracket attached to the roof sheathing underneith the roof panels.

My further thoughts are that once I install the ceiling trim, there will be NO air flow into the Dead Air space between the ceiling and the top of the roof jack and maybe the snow won't be carried in that space if there is no air flow. That space must be kept open to allow for convection and must have at least 2" of clearence from combustables for my insulated chimney pipe. (Manufacturers recommendations) What are your thoughts about the airflow in the dead air space?

You must follow manufactures instructions.


1" gap around the top of the roof jack with only four contact points for the 6" pipe.

Make a slip collar for that part

I will have to consider that, but it still needs to vent heat from the space between the outside storm collar (which sits on the top of roof jack) and the metal ceiling trim piece. I'll take that good Idea to the manufactures rep when I go visit her next week. There's a lot to consider in that little space. Thanks.

Just had a thought. I could use Stainless Stell woorm which won't rust and will let air pass through it yet will stop the snow from entering the cavaity when it's blowing around. Cool ugh? BTW, the spell checker on this site doesn't work...

Good idea. We aint got no spell checker stuff.