Lining a chimney

[trossachs]

I have a victorian house (circa 1865), and am currently in the process of rennovating one of the rooms. Looking at the following webiste;
http://www.bricksandbrass.co.uk/deselem/fireplace/fireplace.htm
The fireplace in the room is similar in style to the early register grate, although the back of the insert opening is fire brick not part of the casting, and it has no damper control. There is no fret or grate, and when I was in the process of looking for a replacment I decided to test the chimney with a smoke pellet.

I found there to be a very good up-draught, but it looks like there is a leak between the adjacent flue, as the smoke was exiting 2 chimney pots.

I have lined a flue before with great success, but it didnt have a fireplace in at the time, it was for a stove installation. Im unsure as to how the liner would be terminated at the bottom, given the small throat due to the firebricks at the back of the insert. Does the fireplace need to come out to fit a register plate, or is there another way to do it. I have been trying to get a chimney guy round to advise, but there is nobody in my area.

Not sure I've made any sense, but any advice would be appreciated. Also anyone know of a good place online for fire grates/frets. The insert is 14" at the front.

If you need any more info, or pictures let me know.

Thanks,

 

[Penners]

Are you sure that there's a leak between the two flues, or is it possible that the dividing wall between the two of them (there's a term for it but I can't remember what it is!) doesn't stop a bit short of the top of the stack?

I hasten to add that I'm no kind of expert in this, but it just seems worth checking before you possibly go to a lot of trouble and expense lining the flue.

 

[trossachs]

I was on the roof when I set off the smoke pellet, and I've had a look down the flue checking for a collaps eor not and they are completely seperate, with seperate cowls also.

 

[Nigel]

We had three chimneys re-lined in 2003 with copex liners and the supplier was able to point them in top and bottom without disturbing the existing fireplaces.

I swept the chimneys recently and the pointing has held (at the bottom anyway) and the seal is still good.

 

[trossachs]

Thanks for the response. I'm not familiar with copex liner. Is this the flexible or regid type. I would need to use a flexible liner as my flue is not straight vertically, has an s bend arrangement (not quite s bend though but you get the idea).

So did they simply point this into the flue at the bottom, i.e. just fill the gap between the liner and the flue walls, or is it attached to a form of plate at the bottom, which is all sealed. If you could provide pictures it would be great, but Im not sure how easy it is to do on here.

Cheers,

 

[Nigel]

Pictures - alas technology and I are not close friends, still using the traditional film.

The copex liner is the flexible type, not unlike the yellow plastic tubing you use in fields to improve drainage, but metal of course. One of our chimneys is a corner fireplace so it has a fair old bend in it. The liners were fed in from above (2 were 3 storey, so 35+ feet in length allowing for the chimney stack) and then simply cut to length and pointed in - no plate or anything. Seems to have worked fine. Bear in mind we have open fires, not stoves.

There have been some posts on this site before about copex liners and I recall someone pointed out best type/prices - hopefully someone can help you on that front.

 

[Penners]

Here's the only picture of copex lining material that I could find.

As you can see, it's a flexible material.

However, beware before you use it. You need to be sure that you can get a sufficient diameter of it down your chimney to handle the combustion products from your fire.

A neighbour of mine (years ago) put a 150mm dia. copex liner down a leaky chimney, and found that it couldn't handle the smoke, etc. from a modest sized open fire.

 

[MdB]

A neighbour of mine (years ago) put a 150mm dia. copex liner down a leaky chimney, and found that it couldn't handle the smoke, etc. from a modest sized open fire.

200mm dia is the minimum for small open fires to meet building regs part J table 2.

 

[Penners]

Ah - good old Part J, Table 2. They don't write stuff like that any more.

Thanks MdB.

 

[MdB]

Ah - good old Part J, Table 2. They don't write stuff like that any more.

Thanks MdB.

Go on give it a read. If you make it past page 3 without Zzzzzzz..... you are doing well.

 

[Penners]

Eh...? Uh....what?

Sorry, I must have nodded off.

 

[Flyfisher]

Ah, but what page were you on at the time?

 

[Penners]

I think I'd managed to get to the end of the title.