Wood burner squeeking flue when windy

Grenage

nazuro4013 said:

The log burner company I had round to quote, said "The void cannot be filled with anything, it needs to breathe through its length to stop heat buildup within the fabric of the building."

This is why I opted to use acoustic board on the inside of the plasterboard. It's not going to be perfect but better than nothing.

That's a bit weird, considering chimneys are often filled with vermiculite after the flue has been fitted.

bjorn_toby_wilde

Grenage said:

nazuro4013 said:

The log burner company I had round to quote, said "The void cannot be filled with anything, it needs to breathe through its length to stop heat buildup within the fabric of the building."

This is why I opted to use acoustic board on the inside of the plasterboard. It's not going to be perfect but better than nothing.

That's a bit weird, considering chimneys are often filled with vermiculite after the flue has been fitted.

I don’t think they are any more. When my log burner was fitted a couple of years ago I asked about insulation; my thought being that it would keep the flue warmer and thereby stop downdraughts developing.

They said they didn’t insulate flues anymore more as the single skin brickwork of a chimney was prone to transferring moisture into the insulation. The flues then rusted through in double quick time.

Edit - although I’m googling now and finding most people recommend insulation! Maybe they spun me a line 🤣

Grenage

Yeah that sounds like nonsense.  Anything that keeps the flue hotter for longer is a win.

FreeBear

bjorn_toby_wilde said:

Grenage said:

nazuro4013 said:

The log burner company I had round to quote, said "The void cannot be filled with anything, it needs to breathe through its length to stop heat buildup within the fabric of the building."

This is why I opted to use acoustic board on the inside of the plasterboard. It's not going to be perfect but better than nothing.

That's a bit weird, considering chimneys are often filled with vermiculite after the flue has been fitted.

I don’t think they are any more. When my log burner was fitted a couple of years ago I asked about insulation; my thought being that it would keep the flue warmer and thereby stop downdraughts developing.

They said they didn’t insulate flues anymore more as the single skin brickwork of a chimney was prone to transferring moisture into the insulation. The flues then rusted through in double quick time.

Flexible flue liners are either 316 or 904 stainless steel. They will not rust in your lifetime from a bit of moisture in the chimney. - They may well corrode from the inside out, but that is in no way connected with insulation.

WIAWSNB

nazuro4013 said:

The log burner company I had round to quote, said "The void cannot be filled with anything, it needs to breathe through its length to stop heat buildup within the fabric of the building."

This is why I opted to use acoustic board on the inside of the plasterboard. It's not going to be perfect but better than nothing.

I suggest you need another opinion. Ideally from the flue company.

WIAWSNB

bjorn_toby_wilde said:

Grenage said:

nazuro4013 said:

The log burner company I had round to quote, said "The void cannot be filled with anything, it needs to breathe through its length to stop heat buildup within the fabric of the building."

This is why I opted to use acoustic board on the inside of the plasterboard. It's not going to be perfect but better than nothing.

That's a bit weird, considering chimneys are often filled with vermiculite after the flue has been fitted.

I don’t think they are any more. When my log burner was fitted a couple of years ago I asked about insulation; my thought being that it would keep the flue warmer and thereby stop downdraughts developing.

They said they didn’t insulate flues anymore more as the single skin brickwork of a chimney was prone to transferring moisture into the insulation. The flues then rusted through in double quick time.

Edit - although I’m googling now and finding most people recommend insulation! Maybe they spun me a line 🤣

I can certainly see that a single skin wall could allow through moisture which is usually kept at bay by the flue area being ventilated. So that makes sense.
I guess if the fire was used regularly, the resulting heat would keep everything dry, but if left, then it could well promote damp.
I suspect you weren't poorly informed.
The OP's situation is very different - this is an internal boxing, and the purpose of the packed insulation would be to block noise transfer, with the added insulation value being only a minor bonus. 
You'll likely find that the twin-walled flue is already quite touchable, heat wise.

WIAWSNB

Nazuro, have you tried flexing the flue in order to provoke the noise?
The clamps have screwed tighteners on them - have you tweaked these?

nazuro4013

Ok, so some mixed views it seems. Stuffing with insulation would be easier, but ChatGPT seems to think that the ventilated firestop spacer is there for a reason, in order to provide ventilation around the flue and that stuffing the void with insulation would breach building regs compliance. 

I have been able to provoke the noise but haven't attempted to tweak annything yet as been too busy. Will have a go on Monday

FreeBear

nazuro4013 said: but ChatGPT seems to think that the ventilated firestop spacer is there for a reason, in order to provide ventilation around the flue and that stuffing the void with insulation would breach building regs compliance.

Never trust AI - Way too easy to poison the LLM database with false information so that it spits out the wrong answer.

nazuro4013

I loosened the bracket and put some "fire rope tape" around the flue and tightened the bracket. Can't hear the squeeking now when I move the flue, but I'm not planning on decorating the room until September so hopefully there's enough time for it to be windy and see if it's done the job!