Greg Rodie

John F Dean wrote:It is my understanding that hot galvanized metal can give off toxic fumes.   You may want to check into that possibility.

It's for a tent, and it is known to do a burn in outside.

Douglas Alpenstock wrote:Hi Greg, what's your reason for going with double wall? You'll lose a lot of radiant heat, especially in the first 6' of pipe.

If it's just to protect a tent wall, perhaps an oversized double wall could be a sleeve that provides a heat shield for your single-wall pipe as it goes through.

I'm also worried that there will be slow offgassing from the double wall pipe. Unless you hit it with a propane torch, it might not be easy to fully offgass the zinc with just the stove heat.

This all hinges on where you plan to install this. Can you give us a bit more info?

(Aside: I just picked up a Camp Chef Alpine Heavy Duty Cylinder Stove for my tarp sheds and small shelters. Haven't unboxed it yet. I'm looking forward messing around with chimney experiments too!)

I didn't consider the radiant heat. I was just seeing that wood stove pipes are ridiculous priced, and seeing how kni-co uses galvanized...I thought why not. It is for a hot tent made for stoves.

The Kni-Co wood stoves use a single layer galvanized exhaust that has to be burnt in. The galvanizing burns off, so you have to do it outdoors the first time. I want to reduce the 4" hole to 3", and use double wall water heater exhaust. It is only rated at 400 degrees, but I assume that is to protect the galvanizing. Can I get the permies forum seal of approval on this?

Thanks both of you for the welcome, and the irrigation technique. One of my beds is basically mels mix, with composted manure/mulch, perlite and peat moss. Another one has that same mix, but with top soil mixed in. The next 3 are composted manure/mulch and topsoil with no perlite or peat moss.  The last one is 8" of composted manure/mulch only, with no wood frame...straight on grass.  The service moisture seems ok actually, and I think everything is going to be ok.  :)  I started with the raised beds, and am now doing a no dig method.  

Hello...I'm new here, and this is my first garden.
I just planted a new garden over the past few weeks.  I set the timer on the sprinkler, and woke up to the water still running!  It must have been 9 hours.  I have transplanted tomatoes, beans sprouted from seeds, and all kinds of other seeds started.  They are all raised beds, but they seem to hold water longer than I think they should.  Could I kill anything?  We were just talking last night about going to a hand watering system.