Rubber shed roof and installing a wood burner

by Kelly
(Berkshire, UK)

Hi there, I am in the process of building a rather modest 20ftx10ft shed from old pallets, its going really well but I'm a little stuck on the woodburner.

What do I need to do to install one safely? I have a recycled propane gas bottle that has already been made into a wood burner and 15ft of 4" galvanised steel tubing coming my way to be used as the flue. The roof of the shed is going to be covered with EPDM rubber instead of felt as I want it to last longer.

My concern is the passing of the flue through the roof. I've seen these rubber flue collars and figured that would probably be enough to protect against the heat of the flue but wondered on what else I should use.

The wood burner is to be set on a 1.5m square by 2.5" thick yorkstone slab and surrounded at base level with fire retardent ply so that should hopefully be more than good enough... just the roof exit is what i'm worried about, so any advice would be greatly appreciated.

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Oct 04, 2010
by: TK

doesn't galvanised steel give off poisonous fumes when heated?

Apr 16, 2010
Hmmm... back to the drawing board
by: Kelly

Thanks for the advice, I weasn't sure at all on the use of the rubber to be protective enough even though a friend said it would be. Think I may leave the wood burner for a while until I can afford the proper flue kit, although with the height of the shed being over 8.5ft its gonna cost a small fortune on the flue... more thought needed.


Apr 15, 2010
Have 999 on speed dial...
by: GreenBoy


The 4" steel tube you are going to use as a flue - is it actually flue pipe (with a welded seam, or is it some old steel pipe from a factory etc which is considerably thicker walled and extruded?

My concern is the heat - the rubber ring you see round flues is a rain cap designed to stop water running down the flue into the roof and causing rot - they do not protect the heat from the heat.

Generaly you should use a section of twin wall flue pipe where it passes through the roof as this stops the hot pipe touching the roof, and causing fire.

please look at for more information

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