We have a room in our 1930s house which has 2 external walls. The
outside is rendered and there is no cavity, i'm not entirely sure what
the walls themselves are made of. brick/block etc.
Anyway this room is disproportionately cold compared to the rest of the
house, and we want to move our daughter into it. so we need to sort out
the temperature issues.
It has a relatively large radiator - but i think the problem is really
the insulation. I've laid an extra layer of insulation in the loft above
this room but it didnt make any difference.
The window is double glazed and doesnt have any draughts.
So i'm wondering if there is any way to boost the insulation in the
walls? some sort of additional insulated board? I'd obviously be
looking for maximum performance for minimum additional thickness. Any
other ideas? My builder mentioned insulated plasterboard, but I want to
be really sure that whatever solution we go for will actually work. Do i
need to get some sort of insulation expert in to assess it?
Buy (or borrow) an infra-red thermometer, and use it to find
the temperature of all the walls/floor/ceiling/doors/windows.
To a first approximation, the coldest ones are where the most
heat is being lost, and the ones you should attempt to reduce
the loss with insulation. The window is likely to always be
the worst, but it hopefully isn't a large proportion of the
surface area of all the external walls and ceilings, and if
you can fix the others, the window alone won't matter.o
It may be that the radiator size was never properly calculated.
It's all too common for a small room to get a small radaitor
and a large one to get a large radiator, without taking into
account the actual heat losses, which for a small corner
upstairs room, are going to be significantly bigger than
the size of the room alone would suggest.
What's the condition of the external rendering? If it's on
it's last legs, you might consider ripping it off, fitting
external insulating board, and then rendering over that. In
many ways, external insulation can be the best, and the reason
it can't be done is that it would damage external features of
the house, but if it's already rendered, that might not be an
Failing than, loft insulation as you've done, and then
insulating the walls inside as you suggested above.
Does the room have a fireplace with a flue still open?
Make sure the radiator isn't blocked with cobwebs behind
it, inbetween panels, or in the vertical air flutes.
[email address is not usable -- followup in the newsgroup]
I've been contemplating this for a while (I also live in a 1930s house
with rendered walls and no wall cavity).
Does anyone have a rough idea what sort of cost I'd be looking at to
have the rendering stripped, external insulation added and new rendering
done on a 4 bed end-terrace house?
Danny Colyer <http://www.redpedals.co.uk
"I'm riding a unicycle with my pants down. This should be every boy's
On Saturday, November 3, 2012 2:50:25 PM UTC, Danny Colyer wrote:
Render removal: SDS drill £100, chisel bits £7 at aldi
Insulation: google celotex/kingspan seconds. IIRC BR requires about 3". Also insulation clips.
Render: EML, preferably in SS, SS screws, cement, lime, sand, 1:1:6
£10K - ish. You could do it yourself much cheaper, of course.
I gave it serious consideration, but in the end decided to go for
internal insulation, with the exception of one internal gable end wall
which will effectively be externally insulated - for one very good
reason, as follows.
I realised that the likelihood of achieving total sealing and
weathertightness around all the doors and windows without having
access to professional equipment was small. It might work in the short
term but I've no intention of clambering around ladders and
scaffolding in my 70s, when problems are likely to occur.
The two-storey gable end wall is shared with the workshop and is, in
reality, an internal wall, so that can be insulated on the workshop
side with no worries about weathering. Bonus point there, is the 2ft
thick wall will provide a large thermal mass for the house side.
I had a similar problem about 30 years ago when my 10 year old son moved
into his own room. I lined the whole thing in cork tiles, which was
surprisingly effective given the modest thickness, plus of course it
became one huge notice board.
Marcel Proust lived in a cork lined room
Research has been done, google it.
It's also good for burning calories. I like to eat. A lot. And high calorie
foods like chocolate. People don't understand why I'm not fat. I never wear
warm clothes, I swim outdoors all year round, and I only use heating to prevent
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