fireplace has double pipe exhaust going straight up. Present construction
has NOTHING near that pipe and the only place the pipe structure is
touched [mounted] is a couple of places. one is the transition from room
into attic. That transition is done with a square sheet flashing made for
such. The wood surrounding only touches the outer edges of that flashing,
about 1-2inches at the smallest. Round pipe through a square metal
flashing section. and the flahsing has vertical metal pieces extending
up/down approx 1.5 inches.

The question relates to the fact that I need to make a robust structure in
that area and a 2x4 may be touching the double pipe's outside surface. Is
that a good idea? [Poorly worded question garranteed to get the answer,
no.] Does code allow it in most cases? Does safety dictate the 2x4's
should be kept at least the distance from the outside of the pipe the same
distance that the flashing provides, at the minimum separation?

RobertMacy wrote:
fireplace has double pipe exhaust going straight up. Present
construction has NOTHING near that pipe and the only place the pipe
structure is touched [mounted] is a couple of places. one is the
transition from room into attic. That transition is done with a
square sheet flashing made for such. The wood surrounding only
touches the outer edges of that flashing, about 1-2inches at the
smallest. Round pipe through a square metal flashing section. and the
flahsing has vertical metal pieces extending up/down approx 1.5
inches.
The question relates to the fact that I need to make a robust
structure in that area and a 2x4 may be touching the double pipe's
outside surface. Is that a good idea? [Poorly worded question
garranteed to get the answer, no.] Does code allow it in most cases?
Does safety dictate the 2x4's should be kept at least the distance
from the outside of the pipe the same distance that the flashing
provides, at the minimum separation?


Are you sure that's double wall and not triple ? Is this a wood burner or
gas log fireplace ? IIRC the triple requires like 6" clearance at the
ceiling where it goes from single wall , double would be even more . I'll be
installing a triple wall stack sometime this week for my wood burning stove
, and there won't be any wood closer than 4" at any point .
--
Snag



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On Mon, 09 Dec 2013 18:39:29 -0700, Snag wrote:

...snip....
Are you sure that's double wall and not triple ? Is this a wood burner
or
gas log fireplace ? IIRC the triple requires like 6" clearance at the
ceiling where it goes from single wall , double would be even more .
I'll be
installing a triple wall stack sometime this week for my wood burning
stove
, and there won't be any wood closer than 4" at any point .

Gas fireplace. From experience, wood burning is a LOT hotter!

Fireplace was installed by Contractor during new home construction. After
their bankruptcy, can't locate Contractor to ask questions.

There is a two foot 'extension' inserted into the stack that does not
match rest of fireplace and venting system. Venting system has very shiny
surface finishes, looks like all came as a kit from fireplace [company
also bankrupt]. The section was added because of the higher ceiling and
was obviously purchased from standard outlets like HD or Lowes and has
label 'double lined' or such. There is a UPC code label stuck on side of
pipe.

Hmmmm. paper label stuck on side of pipe? Wonder if that should be removed
before operation, or if that outside pipe surface really NEVER gets hot?
If I hadn't torn out mantle walls, I would never have found paper label on
side of pipe.

On Tuesday, December 10, 2013 9:55:19 AM UTC-5, Robert Macy wrote:
On Mon, 09 Dec 2013 18:39:29 -0700, Snag wrote:



...snip....

Are you sure that's double wall and not triple ? Is this a wood burner

or

gas log fireplace ? IIRC the triple requires like 6" clearance at the

ceiling where it goes from single wall , double would be even more .

I'll be

installing a triple wall stack sometime this week for my wood burning

stove

, and there won't be any wood closer than 4" at any point .



Gas fireplace. From experience, wood burning is a LOT hotter!



Fireplace was installed by Contractor during new home construction. After

their bankruptcy, can't locate Contractor to ask questions.



There is a two foot 'extension' inserted into the stack that does not

match rest of fireplace and venting system. Venting system has very shiny

surface finishes, looks like all came as a kit from fireplace [company

also bankrupt]. The section was added because of the higher ceiling and

was obviously purchased from standard outlets like HD or Lowes and has

label 'double lined' or such. There is a UPC code label stuck on side of

pipe.



Hmmmm. paper label stuck on side of pipe? Wonder if that should be removed

before operation, or if that outside pipe surface really NEVER gets hot?

If I hadn't torn out mantle walls, I would never have found paper label on

side of pipe.

The common distance is 2 inches I believe. You can't have it contacting the wood framing. Everywhere I have seen it, it is hung with metal straps. And flashed around it like yours when it passes through fire barriers such as a room ceiling.

On Tue, 10 Dec 2013 12:44:27 -0700, jamesgang
wrote:

...snip...

The common distance is 2 inches I believe. You can't have it contacting
the wood framing. Everywhere I have seen it, it is hung with metal
straps. And flashed around it like yours when it passes through fire
barriers such as a room ceiling.

Thanks, that's about the distance at the minimal spot between the pipe and
across the flashing.