Supporting a triple-wall pipe

[LCEiss]

I've installed a new stove, and just got the stainless triple-wall pipe up through the roof. Since the pipe extends more than four feet above the roof I will need to support this chimney with braces.

It sits in a box attached to the attic rafters, but it is not to touch anything else above that as far as I can tell from the instructions.

Here is my question: If the chimney did not require these braces, what normally keeps it from wobbling?

Thanks,
Larry

 

[bholler]

I've installed a new stove, and just got the stainless triple-wall pipe up through the roof. Since the pipe extends more than four feet above the roof I will need to support this chimney with braces.

It sits in a box attached to the attic rafters, but it is not to touch anything else above that as far as I can tell from the instructions.

Here is my question: If the chimney did not require these braces, what normally keeps it from wobbling?

Check the instructions. Most chimneys require a roof support if you are more than 5' above the roof

 

[LCEiss]

Check the instructions. Most chimneys require a roof support if you are more than 5' above the roof

Yes, and this one is no exception. I'll be installing a roof support, but I don't understand what would have stabilized it if it had been only three or four feet above the roof. It can wobble.

 

[Heftiger]

Did you use a roof support? I'm no installation expert, just reading the catalog.

 

[LCEiss]

Did you use a roof support? I'm no installation expert, just reading the catalog.

View attachment 170756

I did not. I have never seen this component in any of the literature I have.
Thanks for this. I'll be installing another stove soon, so I needed to know this.

This answers my question.
Thanks again.

 

[bholler]

I did not. I have never seen this component in any of the literature I have.
Thanks for this. I'll be installing another stove soon, so I needed to know this.

A roof support like that is not necessary in most cases Most times there is the support box at the bottom and atleast one more support bracket on the way up through

 

[LCEiss]

A roof support like that is not necessary in most cases Most times there is the support box at the bottom and atleast one more support bracket on the way up through

That makes sense. Thanks. This is kind of an ad-hoc house that was constructed over a period of maybe 150 years by many different folks. Consequently, it doesn't conform to generally accepted practices and there was no way to use a fire shield or insulation shield, and no secondary support opportunity. That bracket may be necessary for my next stove, so it's good to know it exists.

Thanks everyone.

 

[begreen]

The stack is supported by the chimney support box. The storm flashing cone keeps it from wiggling.

 

[bholler]

The stack is supported by the chimney support box. The storm flashing cone keeps it from wiggling.

it should but some flashings dont do a very good job of that

 

[LCEiss]

The stack is supported by the chimney support box. The storm flashing cone keeps it from wiggling.

This adds depth, thanks. The cone on this one is larger than the pipe such that the pipe does not touch the cone. I thought that was really strange myself, but it's all from the same vendor and designed that way on purpose. I think it's because the cone is designed to work with many different roof pitches.

 

[LCEiss]

it should but some flashings dont do a very good job of that

And this is one of those. No, or nearly no, contact with the pipe.
I'll be securing the chimney with appropriate supports, so I'll be OK. I was just concerned I was missing something, but it's just the way this particular system works with my very odd house.

 

[begreen]

Is this with DuraPlus chimney?

 

[LCEiss]

Yes it is.

 

[begreen]

That may be the difference. DuraTech, double-wall storm collars seem to fit ok. There's a little play, but not a lot.

 

[LCEiss]

That may be the difference. DuraTech, double-wall storm collars seem to fit ok. There's a little play, but not a lot.

OK, thank you very much.