Gas Fire installation

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Hampshire
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Hi ,we have gas fire installed in our sitting room at present,the chimney has been taken down at first floor level because we have had new roof to our bungalow with rooms in the loft area.We want to have flue installed through the roof so we can use the gas fire downstairs again.
Our gas fire installer called the fire manufacturer who did not know if we need flue all the way from the fire to the top of the roof or just from the plate level on the first floor.
The installer rang the local gas safe inspector who said that he can install ridgid flue from first floor level with plate over the chimney ,testing that it is sealed and no fumes leaking through.
Does anyone know if this is how it is done? Another installer said that he would put flexible flue from the fire up through the chimney to first floor with plate over the chimney and then ridgid flue out through the roof .
What is the right way (safe way)
 
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TBH the safe way would have been to not leave the gas fire there when it's chimney was removed!
 
I have done many on council contracts using flexi liner then twin wall boxed in through bedroom/whatever terminating in a vented ridge tile.
 
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I have done many on council contracts using flexi liner then twin wall boxed in through bedroom/whatever terminating in a vented ridge tile.

One engineer says flexi from the fire up to first floor then plate over chimney and twin flue through the roof to roof vent.

Another says no need for flexi from fire but plate over chimney on first floor and twin wall up through the roof to vent .This last option we prefer but is it safe ?
 
I have done many on council contracts using flexi liner then twin wall boxed in through bedroom/whatever terminating in a vented ridge tile.

One engineer says flexi from the fire up to first floor then plate over chimney and twin flue through the roof to roof vent.

Another says no need for flexi from fire but plate over chimney on first floor and twin wall up through the roof to vent .This last option we prefer but is it safe ?

Yes, providing the plate is properly fitted and sealed.
 
If there is a large difference in area of the brick chimney then I would be worried that the sudden reduction in cross sectional area might reduce the flow through the combined flue system.

If I was doing it then I might err on the side of caution by using the liner if I had an offcut in my store. I would not charge much more for that though.

However, the previous poster specialises in gas fires and he does not see it as a problem.

In any case the flue will be tested on completion and has to pass these tests to demonstrate that its safe.

Tony
 
Another says no need for flexi from fire but plate over chimney on first floor and twin wall up through the roof to vent .This last option we prefer but is it safe ?[/quote]

Yes, providing the plate is properly fitted and sealed.[/quote][/i]

To the OP: I am afriad that I may have got this wrong. A job has come up, simiar to yours, so I have been scouring Part J, and it may well be that you CANNOT reduce the cross sectional area of the chimney, during the course of the run. You would have to line the chimney from the bottom. I have got to go out, and I am going to make sure of this, hopefully tomorrow. I don't have a hard copy of J, and it ios a pain reading it in the laptop!

I hope this hasn't csaused any aggro.
 

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