Redundant flue.

bullethead123 · 30 Mar 2021

Hi all,

I need to hire a gasman to remove a couple of gas heaters and a plumber friend says that, if I don't also have the associated flues removed, a damp problem may occur. However, the flat is on the second floor and so outside access is a problem.

I think the walls are cavity. If so, would it be possible to cut the flue pipe twice from the inside of the flue pipe thus effectively removing the water conduit?
Of course, the exterior part of the flue would remain in place. Would this cause a problem at all?

Could this be a solution?

Chris

footprints · 30 Mar 2021

Getting the liner out to cut it and then back and sealed would not be easy. I would try cutting a bit of plastic or alli sheet to fit inside with a bolt through the centre to grip it with then seal it against the outer grille with silicone. Stuff the pipe with insulation and make good on the inside.

bullethead123 · 30 Mar 2021

Thanks for your input Footprints, but I wasn't thinking of removing the flue, I was thinking of cutting the mid section of the flue out from the inside. There must be a power tool I could buy to achieve this.
My thinking is that, if there is no physical conduit for rainwater to pass into the flat, then there will be no damp.

footprints · 30 Mar 2021

Might cut it with a Dremel tool (like a mini angle grinder but it will take forever.

https://www.toolstation.com/power-tools/multi-tools/c446?brand=Dremel

ianmcd · 30 Mar 2021

Depending on the make and model of the wall heaters some had a sort of telescopic flue, sealed with heat resistant tape, you might be able to just remove the tape and split the flue, do you know the make and model of the heaters ?

bullethead123 · 31 Mar 2021

They are " Baxi Brizillia" heaters. If I cannot collapse the flues I guess I could get one of these and attach it to my drill

https://www.amazon.co.uk/Mini-Circu...utter+drill+attachment&qid=1617196755&sr=8-11

Is there any reason why this plan wouldn't work?

ianmcd · 31 Mar 2021

bullethead123 said:
They are " Baxi Brizillia" heaters. If I cannot collapse the flues I guess I could get one of these and attach it to my drill

https://www.amazon.co.uk/Mini-Circu...utter+drill+attachment&qid=1617196755&sr=8-11

Is there any reason why this plan wouldn't work?

They have the adjustable "telescopic" flues ,you wont need to cut anything, just remove the tape and the inside part will pull out with a bit of welly, get your big boy gloves on though

bullethead123 · 2 Apr 2021

Sounds great Ian.
I am, of course, assuming that the walls are cavity - they are at least 10" thick so I would think this is a safe assumption - but is there any reason why leaving the outside part of the flue in place would be a bad idea?

ianmcd · 2 Apr 2021

bullethead123 said:
Sounds great Ian.
I am, of course, assuming that the walls are cavity - they are at least 10" thick so I would think this is a safe assumption - but is there any reason why leaving the outside part of the flue in place would be a bad idea?

The terminal will rust over time and can cause a real mess on the outside of the wall, with a bit of patience it can be very inexpensive to yust push the existing flue out, (with someone standing below to make sure it is safey done, then make good from the inside, I have done it many times , the old flue can be used as a template for the hole size to make up a bung, for the existing hole and just use mortar to set it in place from the inside

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Redundant flue.

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