On 19/10/2019 16:00, Another John wrote:
As the nippy evenings and cold nights become more frequent again, I'm
once again thinking about insulating the garage ceiling.

- The garage is roughly 6m by 4m, and our bedroom is above it.

- The bedrooom often feels rather cooler than the main house
(admittedly it's a big room, therefore "airy").

- Yes. I know that bedrooms are supposed to be cooler than the rest of
the house, but I'd rather achieve that by turning down the radiators.

- I keep thinking about sticking (say) 50mm Celotex boards to the
ceiling [of the garage], using mastic of some kind.

- Would it be _worth_ adding more insulation? When built, 25 years ago,
as an extension to our semi, the joists above the garage were packed
with insulation before the plasterboard was fixed. We also have a
roller door fitted, therefore pretty good insulation at that end.

- The whole house is very well insulated in the roof, and also with
cavity wall insulation.

Any comments would be welcome, to help me with this decision!

Cheers
John


I have a garage, utility room, and storeroom below the main house. The
garage door and adjacent pedestrian door are north-facing and because we
are on high ground with a slope coming up to the house from the north
there's almost always air coming in. The kitchen was always very cold
indeed in winter and it turned out this was due to countless small
draughts coming through the floor in-between the boards and round the
edges. I put a plywood floor down in the kitchen and sealed all round
the edges. I also sealed the garage ceiling (there were holes for cables
and pipes). These two measures made a massive difference.

I find it helps to keep the door between the garage and the hall, and
the one between the hall and the utility room, closed in winter. This
reduces draughts coming up into the office above the storeroom, which is
off the utility room. I have put a plywood floor down in the office but
it hasn't been completely successful for some reason.

Bill