We want to have an inset stove fitted into an existing chimney breast.
However, the fitting instructions call for the area surrounding the
stove, to be pastered with 'high temperature plaster'.
Could anyone advise me what this is, or what it consists of?
Most of the "High Temperature" plasters seem to be for the likes of lost wax
casting, and similar foundry practices. I dont think it is going to get that
Problem is, that these plasters wont be very good for trowel finishing.
As an alternative may i suggest sand and cement? perhaps a fire cement
margin at the very edge if the cast iron, and possibly a tier of tiles to
stop the heat getting to the wallpaper?
How hot is it going to get for goodness sake!
The surround for my fire, originally a solid fuel stove was sand/ cement
render with a facing of tiles, originally set in the original render. Now
the recess contains a gas boiler with new tiles secured with ordinary tile
cement, which softens with heat - the tiles are still in place.
I've secured tiles onto plywood using ordinary tile cement a very short
distance away from a solid fuel stove - the tiles stayed put.
I've used ordinary "thistle" plaster as a capping on glass fibre packing
seal on the flue discharge from a gas boiler - still not reduced to powder
and still in place after 25 years of use
Point being that I don't think you need anything too heat resistant adjacent
to plaster around a boiler. I think the manufacturer's are just trying to
offset the bleats of customers who find that the plaster crazes a little
around their boiler by making the heat-resistant claim.
I'd try a normal approach to the plastering and see what happens. Give it a
few days to dry out reasonably before you subject it to intense heat.
Well, Stovax, the manufacturers recommend a minimum of 1500 deg C and
say it should be 1700 deg C.
Speaking to the local Council, Building Regulations and they agree,
saying the actual area touching the built-in stove, should be built
with refractory quality bricks and must be heat resistant plaster.
I've seen solid fuel stoves glowing cherry red. This was back in the
60s-70s when we used them for heating workshops and line cabins.
Advice to use heat resistant rendering in a house is good advice. A
sand cement mix is probably okay if there is a sufficient gap between
it and the stove wall.
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