How to stop rain coming down outside of flu pipe

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So last year, I installed a woodburner in our house. I've done this before and worked with stovefitters in the past, so I have a fair grasp. The issue I'm having is that we are in an exposed area of Scotland, and when it rains with wind, water is coming down the chimney on the outside of the flu liner (not into the fire) and down into the fire opening where it drips down the wall making a real mess. I'm getting some scaffold set up tomorrow so I can take a look at the top. My suspision is the bog standard cowl I have fitted and that the rain is being blown into the gap between the 5" flu liner, and the 6" flu. It's not the flashing or pointing as this has already been done, and the water is only coming down the flu.

My question is how best to seal the flu at the top? Would it be possible to apply some fire cement or mortar in the gap at the top? I will most likely replace the cowl either way a belt and braces approach.

Very much open to any other ideas..

Thanks.
 
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I'm not sure why this wasn't sealed originally, but I stuff chicken mesh down the gap between liner and flue and point it up with sand and cement to provide a sort of flaunching.
A cowl with a wide brim on the top may help cast rain away - but if there's wind then it's only a token gesture.
John :)
 
I'm not sure why this wasn't sealed originally, but I stuff chicken mesh down the gap between liner and flue and point it up with sand and cement to provide a sort of flaunching.
A cowl with a wide brim on the top may help cast rain away - but if there's wind then it's only a token gesture.
John :)
Cheers John. So it's not unusual to seal it with mortar then? That sounds like a plan. I'll get up there later today once the scaffold is up and take a good look..
 
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Personally I can't see why the join wouldn't ever be sealed......it's obvious that something would get in - if not water then wasps maybe.
I'd go for ordinary mortar, ready mixed stuff if you like as fire clay cement isn't very stable in weather.
Just pack the gap with something to retain the mortar as it sets - I've used chicken wire or stove door rope if the gap is small.
Use a quality cowl with a bird guard, you don't want to be going up there unnecessarily.
Good luck with your project!
Regards
John :)
 

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