In message , RJH
writes
On 10 Mar 2020 at 12:13:24 GMT, "Harry Bloomfield, Esq."
wrote:

A friend has a 1960's chalet style semi-house, where the first floor
bedrooms are always cold. Gutters are at ground floor ceiling height.
End brick wall goes up to roof and is CWI. Upper floor windows are set
in the roof slope and have no internal cills. There is CWI at front and
rear, up to roof gutter/roof level.

There is no insulation at front, or rear, between plasterboard wall and
angle of tiled roof, which makes the place drafty, cold and expensive
to heat.

Why draughty? That'd be one of the first things to fix.


Upper floor is smaller than the ground floor, so there is a triangle of
space below the windows, maybe with a 2 or 3 foot base.

He cannot add insulation inside plasterboard walls, because of built in
furniture. What is the usual method of insulating such spaces please?

I have suggested the only way is to gain access via tile removal and
fix thick insulation between timber frame to rear of plasterboard. Or
maybe a spray on insulation foam added to rear of pasterboard.

Enquiries with insulation specialists have produced little interest.

The attic rooms of my house came with about 10cm of fibreglass wool between
the roof tiles and sloping ceiling. Somehow the installer had managed to stuff
it in there from the loft area. I felt it might compromise ventilation, and it
didn't seem very effective.

The method I used was during a refit, with 50mm celotex foamed to the roof
timbers, plasterboard over. Obviously a lot of mess and bother, but it's made
the rooms very easy to heat and keep warm. A 400W heater keeps the temperature
in a 6m x 4m room. at about 17C when it's freezing outside.

Probably of little interest to your pal . . . ;-)

Chalet bungalows often have wide soffits. Mine has 6mm ply slotted in to
the vent strip. I cut sections out between the joists for access and
screwed on an overlapped cover. With fresh paint it is not noticeable.

--
Tim Lamb