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Boring thread title of the year? Probably.
I have a twin wall flue for my stove that exits the house at a 45 degree angle, before hitting another 45 degree bend and heading straight up. The problem is that rain water travels down the outside of the flue, then soaks in to the render on the wall. Its not enough of a problem (yet) to be causing damp but it is staining the render.
I need to create some sort of dam or funnel to redirect the rain water off before it hits the house. I was thinking some sort of rubber trim going around the flue on the bend. Obvious issue is heat (it gets very warm rather than hot). Any other sensible suggestions? I cannot see any product designed for this.
In absence of anyone who knows what they're talking about, or a properly fabricated solution..
How about some tightly-wrapped wire around these points to create a couple of drip channels?
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Unless the problem is actually that the rain's getting all snug as it falls against the wall/flue interface, rather than what's running down the flue?
I was going to suggest the same. Also some waterproofer on the render
Depending upon the diameter of your flue (ooeer) you might find that a Kilner jar seal or a Bialetti pressure seal of an appropriate diameter might work quite well.
Thinking about it you can get oven or stove sealing rope. Tie some of this round the flue tightly with the knot at the bottom and that should both cope with the heat and create a drip to shed the water flow.
Thanks for the suggestions. Got the sweep coming round in a couple of weeks and he'll be replacing the rope in my stove door then, might be the opportunity to try aP suggestion.
Thinking about it you can get oven or stove sealing rope. Tie some of this round the flue tightly with the knot at the bottom and that should both cope with the heat and create a drip to shed the water flow.
Great rainwater diverting solution, but could it be that fire rope will absorb/hold onto the water for far longer and cause the flue to corrode?
The other issue is angle of flue. Pulling rope tight will draw it around its tightest diameter which will mean rope will not hang directly down.
We've got a metal collar around ours just above where the flue exits the roof. Admittedly it was all fitted when we bought the place but looks like a proper part that came with the purpose in mind to help with weather deflection - I know it works as when it got dislodged in a storm once we had a trickle of water down the flue!
The Fire Side in West Linton are really helpful, plus I can also recommend Simon at Able Sweep.
I suspect that the flue is pretty wet now, and if it's running into the wall that'll be consistent wetness. The rope should be relatively low absorption because that's not a good thing for stoves, particularly when in contact with glazed panels.
As long as the knot is at the bottom and the rope is in full contact that should work.
Sugru?