Chase-Top DuraPlus Chimney Termination with a Quadrafire 7100 / Questions

[farmfitz]

Guys, I ran all my DuraPlus pipe centered through a 2' x 4' chase for a Quadrafire 7100 installation. I was going to order a stainless steel chase top with a standard 3" collar. Then install the pipe through it, pop on the storm collar (with high-temp adhesive), and the cap, and consider it done.

Simpson, the chimney manufacturer said (per phone conversation) that I can not terminate this DuraPlus pipe unless I use their galvanized flat-roof flashing. It's basically a galvy scrap with a cone on top. They said this is necessary to get the UL approval.

Every hear of this? This sounds kind of nutty. Even my chase-top manufacturer is puzzled about this one.

Any info or similar experience feedback is appreciated.

Thanks.

 

[DAKSY]

Total BS. The manual specifically states that you can (not HAVE to)
purchase factory made chase-tops or they may be field constructed.
We make em from 16 ga. sheet aluminum & add the specified collar,
silicone the crap out of the juncture, install em & we're done.

 

[farmfitz]

That's what I thought. The Simpson Tech guy was very adamant about the heat that will build up in the "unventilated" chase.

I've installed class A chimney before, and it's only fairly warm on the outside of the pipe during a hot burn. I really don't see how adding this "cone" instead of a "flat-top" chase cover will make any difference.

What have other duraplus chimneys owners used for a chase top?

 

[DAKSY]

A flat chase top will not allow any precipitation to run off.
When we install em, we put a couple of 3 - 4" wide x 12" long
strips of Durarock close to the vent pipe...
This allows the chase-top to be pulled down slightly towards
the edges to allow for the run off...