Roof jack, SS and Galv.

[Tweegs]

Mad rush to get it all up and going, everyone here knows the season has come early.

I’m short a roof jack right now but can get my hands on a Stainless one tomorrow. Problem is that my stack is all galvanized.

Can’t help thinking about dissimilar metals, corrosion, rust etc. if I mate SS and galv together.

Really don’t want to trash a roof jack that is twice the price of a galvanized, nor do I want to add the expense of converting my stack to all stainless.

Problem mating these?
No problem?
Looking for a little guidance.

[maple maniac65]

my stack is stainless and my roof jack is galvanized and been that way for ten years. I have had no problem then again I have not climbed up on the roof in at least three years.

[Flat Lander Sugaring]

get the stainless install it all and then after season go get stainless stack to match

[Tweegs]

Problem solved.
Had a chance to do some digging around. The short of it is: Galvanized contains zinc, and yes, when mated to SS, it will cause corrosion (It’s that dissimilar metal thing going.)

The roof jack was not a 10” as I was told, but rather a 12”. So…install the jack, run my 10” stack right up through it, ring the 10” with high temp insulation (ceramic blanket) near the top to hold the gap, add a sacrificial collar and call it a day.

I’d like to have a SS stack, but the price is a sticking point. The shack is getting some additions and we plan to get on vacuum before the ’13 season. This set-up is going to have to make it a couple of years before I can talk the wife into springing for a new stack. Good to know someone else has the same configuration that has lasted. Sets my mind at ease, for now.

[Flat Lander Sugaring]

roof jack supposed to be 2" larger than stack pipe, at least thats what I have heard, think its for cooling purposes