Still a combustible wall?

[NVHunter]

My house has a day light basement with the exterior wall built out of cinder block. The thimble location (hole in the cinder block wall into chimney) is located in this block wall.

Question is, the wall is only block with no combustibles in it. The second story is 2x6" construction which sits 20" above the thimble location and is obviously combustible material.

Is this wall considered combustible due to the second story ontop of it?

Thank

 

[Grisu]

Based on the building code for fireplaces that combustibles beyond 12" from the firebox are allowed, I think the wall would be considered non-combustible. http://www.masonryconstruction.com/air-entrainment/fireplace-codes_2.aspx From a practical point of view, I would also be surprised if that 2nd story wall would be even above ambient temperature. That said, your local building inspector will have the final say in this.

 

[DougA]

Is this wall considered combustible due to the second story ontop of it?

Cinder block is not combustible. 20" to combustible (your 2x6) would depend upon the specs on the stove pipe.

 

[NVHunter]

My mistake. I just measured the distance from ceiling to thimble hole and its 12". Does that change things?

I'm going to have a stainless steel liner with tee installed in the chimney to the thimble.

Do you wrap insulation around the tee which comes through the wall? I'm assuming so...

Stove pipe after thimble (inside the room) will be double walled rated at 6" clearance for walls and 8" for ceiling if I remember correctly.

 

[David.Ervin]

I think double walled pipe can significantly reduce the clearances required. Check with your stove manufacturer's specifications, and maybe your insurance company to be sure!

 

[kennyp2339]

Single wall pipe you need 18" minimum clearance to the nearest combustible, double wall black pipe is 12" to combustible, class A all fuel (insulated) (stainless steel chimney pipe) you need 2" to combustible.
If your going to use double wall pipe you may need to get creative to attach through the thimble due to the outside dimensions being larger than 6" round. You may need to make an adapter using a crimper and single wall pipe.

 

[NVHunter]

Single wall pipe you need 18" minimum clearance to the nearest combustible, double wall black pipe is 12" to combustible, class A all fuel (insulated) (stainless steel chimney pipe) you need 2" to combustible.
If your going to use double wall pipe you may need to get creative to attach through the thimble due to the outside dimensions being larger than 6" round. You may need to make an adapter using a crimper and single wall pipe.

The double wall stove pipe I've researched, DVL and ICC Ultrablack both have 6" clearance for walls and 8" clearance for ceilings for DVL.

Not sure where the 12" came from for double wall clearance.

Because I'm curious, how do you connect stove pipe (double wall) to the tee connector of the SS chimney liner once it's through the hole in the cinder block?

Also, do you wrap the insulation around the tee when it's in the masonry hole i have?

 

[DougA]

I'm no expert but I would much prefer to put the SS chimney through the wall, not use double wall stove pipe.

 

[NVHunter]

I'm no expert but I would much prefer to put the SS chimney through the wall, not use double wall stove pipe.

I agree with using class a SS chimney through the wall and I never have planned to use stove pipe to go through the wall.

My original question was asking if the wall was still considered non-combustible with the thimble hole being 12" away from the combustible ceiling material.

My plan is to install an insulated SS chimney liner with tee. This tee is to come through the thimble location in the cinder block wall. Then install a masonry thimble connector to the tee. See above photo for something I'd use when penetrating the wall. Then have this thimble connector connect to the double wall stove pipe once inside the room.

Originally I was asking about the wall and if it was considered combustible with the thimble being 12" from the ceiling. Nothing more than that....