Clearance to Combustibles Question

[Dajolu]

I am having an alcove built to house a Hearthstone GM60. The Alcove is being built to the proper clearances in the GM owners manual. I am utilizing an existing masonry chimney that is outside of the house. It measures 20" x 20" exterior. It has a clay liner with inside dimensions of 8.25" x 8.25" and i am guessing an 1"+ airspace around that. I am hoping to pass a snout to a tee which will be connected to an insulated liner. Will I have clearance issues with the wall (in orange)? Looks like the chimney was built up against the lap siding of the exterior of the house.

 

[begreen]

That is the intent of insulating the liner. It directly addresses this concern.

 

[Dajolu]

That is the intent of insulating the liner. It directly addresses this concern.

Sorry, I should have made my question more clear. I am not concerned with the insulated liner. I am concerned about the snout going into the existing masonry chimney. I plan on insulating the snout as well. However do I have enough clearance around the snout, especially to that exterior house wall the is up against the chimney?

 

[EatenByLimestone]

Your thimble should have listed clearances. The one I installed had an insulation donut that fit inside a 16” on center stud bay.

 

[begreen]

Exactly, this is the intent of the insulated thimble. As long as it's installed per directions, the snout can safely pass thru it and between the studs.

Chimney info - CHIMNEY - PASSING A CHIMNEY THROUGH THE WALL

DON’T Just “Do it” - Placing a wood stove into an existing masonry chimney could be hazardous to your health and house. Read this to learn more. One of our biggest problems occurs when a customer enters the shop and states “I have an existing woodstove into a masonry chimney - I’d like to...

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