"Andrew" wrote in message
...
In article , IMM
writes

"Christian McArdle" wrote in message
.net...
When you add an extension, modern building regulations are going
to require cavity walls and double glazing and the heat losses
in this part are going to be a lot less (could be only a quarter)
of the equivalent size of existing house.

Indeed, I've heard of cases where adding a two storey extension has
actually
resulted in reduced calculated heat losses from the house. This is
because
an uninsulated solid wall was appended by the heavily insulated 2
storey
extension, which had considerably lower heat loss than the original
wall,
despite have many times the surface area.

The old external uninsulated solid wall then becomes internal with a lot
of
thermal mass. This, once charged with heat reduces the peaks of heat
demand.
Unless the extension has a lower roof pitch than the original (using
dormer windows for the upstairs to maintain the same cill height) which
means you have a nasty cold radiator where by part of the original gable
wall is exposed but connected the rest of it which is now within the
house.

PS In all the house makeover, 'get rich quick' etc program, how come I
never hear Ms Beeny and others mentioning the magical word
'insulation' to make the property more comfortable?. Lets face it, if
you are replastering the walls, why not put up insulated PB and skim
that instead ?

Ms Beeny know anything about building? Please! She knows about kitchens
and paint colours, that's all. A well insulated house is far more
attractive to a buyer.


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