Question about distance to combustibles

[johnstra]

I need some input on what distance to combustibles means. I'm putting a new stove in. It'll sit in front of the space where my gas insert fireplace was. I have a framed chase. I built a non-combustible fire box using steel studs and wonderboard. It'll be lined with either brick or slate tile. Behind that is the wall of my framed chase - OSB. The spec on my stove says 18" from single wall stove pipe to combustibles. My combustible wall is 13" but it sits 6" behind my wonderboard/tile firebox and I have fiberglass insulation between the fire box and the wood wall.

My question is, does that violate the rule?

Thanks,
-john

 

[begreen]

Not quite sure how to call this one. It's a good one to ask about. The large air space certainly is going to add a large measure of thermal protection, but it sounds like this is a captive air space and not ventilated. Is that correct? If so, I am not sure what the spec would be. You might be fine, hard to say. With a ventilation slot top and bottom, it would qualify as a wall shield if the insulation wasn't in there. What stove will be installed? What is the clearance if you use a double wall connector?

 

[johnstra]

Hearthstone Heritage is the stove.

Yeah, I think it would be called captive. It's a framed section bordered by studs. The studs are a beyond the 18" requirement. So the space is effectively open at the top and closed at the bottom.

It's not closed up yet, so I could place a wall shield there. It could be 1-2" from the wall and open top and bottom with no insulation between the shield and the wall. What gauge steel should such a shield be made of?

Yes, I can probably use double-wall. My spacing is tight between the top of the stove an the top of my firebox, and single-wall seem easier to find the parts to make the fit.

-john

 

[North of 60]

Just wondering. Your framed chase is or was for your old chimney vent also? What will you be using now?
Cheers

 

[johnstra]

The house had a zero-clearance wood fireplace at one time. It was replaced with a gas insert some time ago and the full height chimney pipe was removed. I'll run my new vent pipe up the existing chase. The clearances are fine for the class A chimney pipe. It's just the stove pipe I'm concerned about.
-john

 

[begreen]

Add a heat shield to the single-wall and you are good to go, or use double-wall and it is no-sweat. If you decide to use double-wall and need help with the fittings, don't be afraid to ask.

 

[johnstra]

Thanks for the input. I'll post photos of my configuration at some point.
-john

 

[North of 60]

The house had a zero-clearance wood fireplace at one time. It was replaced with a gas insert some time ago and the full height chimney pipe was removed. I'll run my new vent pipe up the existing chase. The clearances are fine for the class A chimney pipe. It's just the stove pipe I'm concerned about.
-john

Removed all old and installing a class A. Thats what I wanted to hear. Sounds good. Waiting to see some pics.