What length chimney liner to buy

lagi

Can't seem to see on any sites a guideline to how much flexible flue pipe is needed. Looking at 904/904 grade liner, so don't want to pay for excess. Its for an average sized bungalow.

aelitaman

Well my installer got up on the roof, put down a small section of 6inch flue pipe attached to a rope. Then measured the rope and told me how much to buy.

The point of the small section of flue pipe was to make sure there were no obstructions in the flue and the liner would go in without much fuss.

Greenfires

Basically you need anough to get from the pot to the end of the single wall coming off the stove. You may want to think about getting an installer in - I've had a number of customers who've come unstuck big time trying to do it themselves - the last one was still on the roof at about 8pm trying to persuade the liner down the chimney and he'd been there since dinnertime...

muckybutt

Greenfires wrote: »

the last one was still on the roof at about 8pm trying to persuade the liner down the chimney and he'd been there since dinnertime...

:rotfl::rotfl:

I often get tasked by an installer near me to sweep the "to be lined" chimneys first and do them a quick measure at the same time.

In general from the top of the stove depending upon the gap above you will normally have between 500mm - 1000mm fluepipe that goes from the stove through the register plate and will connect onto the liner.

So sweep your chimney - you will need it doing ! get the sweep to count the rods used from the top of the pot to approx the top of the stove, all you need then is deduct the length of stove pipe and theres your measurement.

lagi

I may do, its finding one within the budget and if we start in the morning will give us more time til 8pm.

Might see if i can find someone to shimmy up roof and drop some rope down for measurement. Don't fancy it myself.

Think you may have nailed it i have some electricians rods, that i could stick something bright on the top and feed them up from the bottom gently. Pretty sure they are roughly about a metre each so will have more than enough.

There was a gas fire there previously, would it still need sweeping?

muckybutt

It would be good practice to sweep before the liner is done - even gas flues should be swept at least once a year but they never do, the first sign of a problem then is carbon monoxide poisoning !

Wont necessarily get soot down - more likely be fluff and dust from the cement.

lagi

Thanks, will keep that in mind. Might be able to get it all combined if i can find the right person.

PaulF81

Use a set of drain rods if you can, push up the flue and see when it comes out the pot. You can also use banboo canes taped using gorilla tape or something similar. Add a metre. Better to pay the 30 quid or so and realize you have too much than having to re-order. We used http://www.fluesupplies.com/, they gave us a free pot hangar and if you have a shorter length, they do "end of roll" deals.

DO get it brushed before install.

DONT expect a HETAS to install a flue that you have purchased. Unbelievably unionist and want extortionate fees for a job that SOMETIMES can be straight forward. If you have any significant kinks in the flue or it looks a bit tight, get an installer in. You can get the local building control to sign it off, we didn't bother as our LA wanted over 300 to sign it off. This was with previous notification and not the "you've been a naughty boy and not told us and now want it signed off". Follow the regs, they are available online, in particular, the CO detector is essential,as are the regs regarding placement of the stove with reference to flammable materials, as well as the sizing requirements for the hearth.

Oh, top tip, when you go up on the roof (at your own risk), do it on a dry day in the afternoon, otherwise you will probably slip off the roof and kill yourself. HETAS may wish to use scaffold, which significantly ups the price.

Greenfires

I think it's a good idea to get BC to sign it off if you do decide to do it yourself. Yes I know their services can be seen as something of a rip off - but if there was ever an issue with the installation - including things like claims from next door for instance for one thing or another -= then if it wasn't signed off you could be held personally liable.

I always find it a bit funny that most people are all in favour of getting a Gas Safe bloke in to sort the gas fire out - but think it's perfectly fine to muck about and DIY it when it comes to a stove. The fact is that CO from a bad stove installation will kill you just as effectively as CO from a dodgy gas fire. Worth bearing in mind...

Andy

lagi

Have had one quote from an installer and agree they only wanted to use their liner, but wasn't the grade i wanted and they didn't seem bothered on quoting me for the 904 that i wanted. The installation was expensive but it was the marking up of all the other parts that made it become ridiculous.
Always intended to get LA/BC to sign it off but will confirm the costs as need to work out cheapest way to do it and hetas installer may work out cheaper overall.

Dug out their original quote and they are saying 7m of flue liner but would rather check it.

aelitaman

I do not think we can tar every HETAS installer with the same brush.

I went through the whole rigmarole of the flue liner is going to cost you 1500 quid malarky when any fool can check the prices on the internet.

What I said to my installer was that these are the prices I can pay, they have a trade account and you get discount so your choice I can buy it all or you can supply at those prices.

He was very agreeable.

For you information. I paid 300 pounds to have the fireplace altered to how I wanted it (bare old brick). 300 pounds to install the liner and the hearth. then 200 pounds to install the stove.