Rick Dipper wrote:
My idea is to run the stove pipe in to the bottom of the existing
(unlined) chimney [for a woodburner]. As the hole in the bottom
of the chimney is over 600mm8600mm,

600x600?

I was going to cover it with a steel plate, cut a circle into the
plate for the stove pipe, then seal the whole lot up with some
suitable sealant.

Is this is sensible idea, or do I need to line the chimney ? All
the UK websites I view talk about lining the chimney. The
chimney has been there over 200 years with no lining, so
why would I want to line it now ?

How is the bottom of the chimney constructed, "stepped"
brickwork, or what? How long/straight is the chimney
above where you'd put the closure plate?

There is an efficiency advantage in fitting a liner. If you need
to, you may be able to D-I-Y with clay sections, but details of
the bottom of the chimney as above are important.

If you fit a closure plate, which is normal practice, you should
also cut a hole for access, e.g. sweeping. It's a good idea to
flaunch in above the closure plate (via the access hole) with
1:1:6 to prevent moisture/gunge seeping past the closure plate.
The access cover can be bolted to the closure plate with
galvanised bolts, and sealed with a silicone rubber gasket.
Use gutter bolts or similar, lock the bolt to the closure plate
with a nut, put the access cover on, and use another nut on
each bolt to secure, this ASCII art will probably be munged,
but a little edit will fix, sorry I cant use FW font from he

----------------- loose cover over access hole
=== | | === bolt
----------------#----- ------#---------- closure plate
=#= =#= lock nut
---#------------------------#----- access cover
=#= =#= nut holding access cover


Why is stove pipe so expensive, websites in the UK quote the
price at 20 (or more) times the cost from US websites ?

Might not be the same stuff. Good old-fashioned stuff is cast
iron, enamelled - cheap is spot-welded sheet metal in the
form of a tube, enamelled. You can get stainless, which I
don't like.

be !
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