Class A through a cathedral ceiling ?

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Nicholas

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Feb 25, 2007
102
The class A will come off the top of a Masonry Heater, so I do not need a support box.
Does anyone know of a Class A that shows a detail of how to run it through a cathedral ceiling??

Thanks,
Nick
 
You will need a roof support bracket (under the flashing cone) and an interior trim collar.

metalbest roof supprt.gif metalbest_trim.jpg

The install would look something like this, but without the conversion to connector stove pipe. Note the roof radiation shields.

xcel roof install.PNG
 
Since the chimney will be supported by sitting ontop of the masonry heater, the roof support bracket is just to center it in the framing, maintaining the 2" clearance?
What brand are these pics from ?

Thanks,
Nick

You will need a roof support bracket (under the flashing cone) and an interior trim collar.

View attachment 69671 View attachment 69672

The install would look something like this, but without the conversion to connector stove pipe. Note the roof radiation shields.

View attachment 69673
 
Yes, it's adding a rigid attachment point at the roof and will also support the above the roof pipe. Metalbest and Excel have this system I believe.
 
begreen,
Thanks for the info.
As for the "roof radiation sheild" I can not find one that is made for a cathedral ceiling in any of the Metalbest or Excel catalogs. Do you remember where the "roof diagram" came from?
I would need to ref when talking to the manufacture.

Thankis,
Nick
 
I think I grabbed that diagram from Excel, but Metalbestos is similar.

Thanks for the tip ridemgis. The key piece missing from the Duratech system is the oval trim piece. But I just downloaded their new 2012 catalog and see that they do have this piece in the DuraPlus HTC section (C9042). They also list a roof radiation shield (C9089).

http://www.duravent.com/docs/L820_2012-may_w.pdf
 
Most of the manufacture contradict them selves in the catalogs. It states a 2" clearance from combustionibles,, but then says it requires a "radiation shield", then other places shows it at 2" with no shield?? So is the "roof radiation shield" cut for the slope of the cathedral ceiling??
Reading the installation for both excel and Selkirk, I found no were that it states that it needs a radiation shield when passing through a roof,, just 2” clearance.



Nick

 
If you really don't need support, use the support box and cut the bottom out to slide the class A thru it. Seal the bottom
where cut out with stove cement. If support is needed you can add the roof support bracket & use both.
This will give you solid 2" clearance all around and a radiation shield. Don't know about other mfg's, but Selkirk support
boxes can be stuffed with insulation (theirs). The 2" gap needs to be insulated if passing from a heated area to the outside.
 
The roof radiation shield is just a metal sleeve, 4" larger in diameter. You could make it out of a strip of sheet metal with a couple attaching tabs. It is trimmed to match the roof slope. It isn't required if all combustibles are 2" or more away from the pipe. However, most often there is a rafter, interior decking, foam insulation, or other combustible that needs protection.
 
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