Chimney structural basic questions

[XiNull]

New member, first time wood stove chimney install,

please be gentle

I'm about to install my chimney and cathedral ceiling support box at my cabin. I'm looking at all the parts i got and just mentally thinking about what I'm going to have to do to install each component. But i have a a question that is specific to the cathedral ceiling support box i'm going to be using, and a few other generic questions. Most of them are about structure and stability of the chimney. I really don't want to install something and it being unsafe.

So first off, I'm installing the JM6CCSK SuperVent kit by Selkirk


What's different about this kit, to a lot of other cathedral ceiling kit i've read about, is that the Class A chimney doesn't sit flush at the bottom of the box. There's a support band that gets attached around the class A chimney with a few tiny screws. That support band has a lip all around, and that seems to just sit on another lip/edge at the bottom of the box.

I'm also installing a rubber boot. My roof is corrugated metal, 9/12 pitch, i'm also not good with heights, and this is a first time install. So installing a rubber boot will be simpler for me

here's the support band with the lip

here's the box, showing the lip (view from inside the box)

this is what it looks like with the support band sitting at the bottom of the box

this shows how the support band goes on the class A chimney. it'll have 1 screw/nut to tightened the band, and a few tiny screws that screws into the outside of the class A chimney wall

This is how it'll look like when it's installed (picture taken from the internet). The class A chimney is sticking out by 5-6 inches, and in this case has been spray painted black to look pretty

So my questions

1. How stable is this going to be for the class A chimney sticking up on my roof? The class A chimney is just sitting in the box, on top of a lip. Plus with my rubber boot, which i'm assuming will have some slack. I can't help but imagine my chimney being movable and loose?!? Especially where the band sits on top of the box lip

2. That support box is supposed to handle the weight of the chimney. I'm assuming that's the weight of the chimney that's inside and the box and above it? or another way to put the questions, does the box also support any weight of the chimney below the support box?

3. If the weight of the chimney below the support box is not supported by the box, then what does support it? Does the weight just rely on gravity on top of the stove?

I think that's all i have for now, i'll probably have more questions once i get feedback to my questions

Thanks a lot everyone

 

[begreen]

Lose the rubber boot. That may be ok for plumbing, but not for a chimney. There are purpose-made flashings for metal roofs. The Excel metal roof flashing is a common solution. Take a look at this thread.

Install components....

Greetings one and all. For a new install, would this be a complete, satisfactory ceiling package minus some pipe?

www.hearth.com

The support box supports the weight of the chimney. The stovepipe weight is much less. This is supported by both the support box and the stove.

 

[XiNull]

Thanks for the feedback,

Unfortunatly i already have the rubber boot, and it's non-refundable

I'm not saying that i wont consider the metal flashing. But i already knew exactly how to install the rubber boot. I have no clue how to install the metal flashing. I looked and asked around for this Excel Metal flashing you mentioned. It looks amazing, but i can't find anywhere to purchase it locally. I would probably have to order it online, possibly even in the states (I'm from Canada).

How about a different product, or a different approach? I'll look for some videos on youtube, maybe you have some links to share?!?

cheers

 

[begreen]

I would still not use it. Sell it to someone on eBay or craigslist. Rubber boots require a ton of screw holes and they don't stand up.
The ICC Excel flashing is a Canadian product.

Where to buy – ICC-RSF

icc-rsf.com

Excel Metal Roof Flashing

This is the Excel Metal Roof Flashing, part number ICC EMF

www.woodmanspartsplus.com

or contact these folks and ask them to ship one to you.

Friendly Fires

Friendly Fires is a full-service fireplace and bbq installer in Belleville, Carleton Place, Cobourg, Peterborough, and Kingston, Ontario.

friendlyfires.ca

 

[begreen]

There is also another Canadian part made by Ventis

Ventis Galvalume Non-Vented Metal Roof Flashings

This is a one-of-a-kind design that solves the challenges of Metal Roof Flashings. Available in galvalume & stainless steel. Includes Storm Collar. Trace the metal roof profile on the front edge of the Flashing and cut for a perfect fit. The Integral Snow Wedge on the high side of the Flashing...

chimneycricket.com

It's recommended to put a cricket (snow wedge) above the flashing to divert snow away from the chimney. Heavy wet snow has taken down many a chimney that is not properly protected.

 

[XiNull]

thanks for the links. I noticed a store in my area. No wonder i never heard of them, they are hidden in the industrial park where nobody shops. I'll go take a drive now and check if they have one available

 

[Eman85]

I installed that style chimney kit, been quite a few years ago and it still works fine. My stove is directly under the pipe so I used a telescoping double wall pipe and the stove supports the weight of it. I have a rubber boot on mine and a corrugated metal roof, it works OK but I should put a metal one on. My roof is no where near your roof pitch. I would not want to walk on a metal roof that steep.

 

[XiNull]

I would not want to walk on a metal roof that steep.

I know, and i'm afraid of heights. The camp is on piers about 3 feet high, walls are 10', plus roof another 9'. with that pitch..all that said, i'm pretty high up there to make that install

I went to the store, bought an ICC Excel flashing for an ICC 8"pipe (10"diameter), which should fit my selkirk 6" double wall which is 10" diameter. I should get it in a few days. They actually had one in their warehouse a few hours away.

now i just gotta figure out how to cut my roof metal to slide that in

It's recommended to put a cricket (snow wedge) above the flashing to divert snow away from the chimney

i was going to, need to find one. I wasn't thinking of it when i went to the store a while ago. But i'll ask when i pick up the flashing later this week

 

[begreen]

Is this old Selkirk chimney pipe? Most modern 6" Selkirk sold here is 8" OD but Canada may have a version we don't.

 

[Eman85]

How close is it to the ridge? You might be able to slip the flashing under the ridge cap. Have you walked on your roof yet? Metal roofs in the cool or the shade can be thrilling. I'm getting old and I've had replacement parts installed. I was on my garage that is 4/12 metal on a cold day and slipped, that was it I'm done.

 

[Newbie78]

As noted, lose the boot. It will not work at a 9/12 pitch worth a damn. Even tho Selkirk says it will....

 

[EatenByLimestone]

So, I just want to throw out to the conversation that metal roofs are slippery, especially a 9/12 pitch. If you don’t feel comfortable on the roof, don’t push it. Paying somebody who has the right tools, experience , and safety equipment is cheaper than a hospital bill and physical therapy.