Best Stack Location?

[briansickler]

Is it best to locate the stacks in the peak of the roof? It seems that would be best for a more leakproof job. I'm using metal roofing on my new sugarhouse. I think these roof jacks get screwed on top of the metal roof. Any advise welcome. I need to order my roof jacks soon. Thanks.

Brian

[red maples]

it doesn't really matter. what ever your preference I off set mine so that I would have more room on the one side of the evap. I have no leak problems.

[twofer]

I've been wondering how to best seal up the stack flashing as well since mine will be located on the side of the roof. My idea was to snip horizontal slots in the metal roof and slide the chimney flashing base up and under. Then all I would have to do is use high temp RTV sealant to seal the slot cuts. At least I think it will work... :confused:

Here is a pic in case my explanation is fuzzy.

http://img838.imageshack.us/img838/8195/chimneycutout.png

[red maples]

that would work
It would act the same as if it were going under like a shingle. but it will stick up a little extra at the bottom because of the grooves in the sheet metal.

I think the best thing to do is contact the manufacturer of the metal roof and see what their recommendations are. In alot of cases they make hot and cold applicable stack flashing that fits nicely with the grooves of the metal roof and look sharp too!!!!

If you are going out of the peak I guess would be easier, now that I think about it, because the flashing can just go over the top srew it on and seal.

[twofer]

The highest temperature rated flashing I've seen for metal roofs only goes to 500°F which seems a little too low for my comfort for an evaporator stack.

[Slatebelt*Pa*Tapper]

here's where i put mine, just liked the evap in the shack at that location and the stack went out were the evap sat..

http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs657.snc4/61710_153511094670203_100000339416896_326140_33193 6_n.jpg

http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs652.snc4/61194_154151277939518_100000339416896_329706_55569 09_n.jpg

[red maples]

nice pics. I have a shingled roof as well. easier to put through the side.

[maple flats]

Just place the evaporator where you want it and run the stack straight up. Either works well. With metal roofing you should plan ahead if going thru one side. The piece of roofing below it should have a cut out notch up from the bottom and the piece above should be notched at the bottom the allow at least 8" overlap. This will only work well if you have the jack custom made so the flashing conforms with the tin profile.
When I was in the outdoor boiler business, we used to have a tin shop make the acks to match the profile of the tin. We offered either 20 ga galv, or 24 ga SS, whichever the customer was willing to pay for. I can't suggest the tinsmith I used because he retired at 75 and died at 85. I would think any good tin shop would do it. You will need to supply a piece of the exact roofing (a scrap will work) and let them know exactly where the center of the stack will fall. If you check you will likely find that the price will be just about what the maple suppliers charge for the generic design. I used to pay $80 Galv and $120 SS in 8" (mid 90's), which was the only size we had. You will also need to specify the pitch of the roof. Good luck.

[briansickler]

Through the peak it is then. I'll still have a good 8' on each side of the evaporator. Plus, easier install. No need for guy wires to stabilize the stack outside. Thanks for all of your input.