wrote:
On 23 Dec, 16:45, (Anna Kettle) wrote:
On Sun, 23 Dec 2007 14:05:32 +0000, andrew heggie

wrote:
On Sun, 23 Dec 2007 12:41:40 +0000, Anna Kettle wrote:
Thats interesting, so it is not essential for building regs to line a
chimney before a stove is put in.
That's right but the difficulty arises in proving that the existing
chimney meets regs without a liner, so an installer would be unsure to
sign off a flue installation plate.
I shall be installing it myself so I dont care about that

I have friends who have a big old
chimney very similar to mine, they didnt line their chimney and it
works perfectly well with a woodburner
As did many chimneys before the new regs came in in 2000.
I fitted my wood burner (small Jotul) 30 years ago and it vents, via a
short 150mm enameled steel flue into a 220mm concrete lined chimney and
works fine. Doing the same job now I would probably opt for a 904
stainless 150mm liner with vermiculite insulation.
You are another person who would go for the insulated liner then ...

Anna
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Dear Anna and Staffbull

1)
"The 2002 edition of Approved Document J of The Building Regulations
stipulates that any work that affects an existing chimney (ie fitting
a new stove or liner) or creating a new chimney now comes under
building control"
2)
"An existing chimney or a new flue or chimney installation must be
given a visual inspection to check that it is in good order, clear of
obstructions and is of a suitable size and type for the appliance you
plan to install. It may be necessary to sweep the flue (which should
always be done anyway before fitting a stove or lining a chimney) and
also, if necessary, to do a smoke test to check for gas tightness. "

As the wood burner is more efficient than on open fire I understand
from the literature (but may be wrong) that there is a much increased
risk of condensate of wood extractive then lining the flue and
becoming a fire risk in itself which is why double lined insulated
flues were invented and put in.

Generally speaking, I researched this and found that it would be at
LEAST twice the price of the stove to get it installed properly and
that I had to have a positive air supply which rather ruined my plans
for air tightness so I now have a normal fireplace and flue and keep
the flue closed when not in use


In my case it was about a grand to do two pipes..one downstairs from the
aga, one upstairs from a wood burner.


The air feed was accomplished by a 4" p[ipe into the loft for the
latter, and a underfloor vent of tow 4" pipes for the aga.



If you have access to lots of free wood and can store it on the
premises then go for it but it will cost and even if you do it
yourself you will need a helper to put in the liner and it will take
twice the time you think it will!
chris