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

"Another John" wrote in message
...
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").

Trivial to measure the temperature and see if it actually is cooler.

- 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?

Normally not in your situation.

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.

So unlikely you are losing much heat that way
unless its very leaky due to drafts in the garage.

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!

On Saturday, 19 October 2019 16:00:54 UTC+1, 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

If you have an integral garage there will be fire resisting material on the ceiling to prevent any fire in the garage spreading to the house.
It might be fibre cement board or extra thick plaster board.
The last thing you want is flammable insulation.

https://www.mybuilder.com/questions/...garage-ceiling

http://nhbccampaigns.co.uk/landingpa...n1/default.htm
Ideally would be non-flammable mineral wool between the joists.

On Sun, 20 Oct 2019 02:26:30 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH troll****

02:26 in Australia??? AGAIN? Do you know NO shame AT ALL, you psychopathic
senile pest?

--
about senile Rot Speed:
"This is like having a conversation with someone with brain damage."
MID:

On Saturday, 19 October 2019 16:00:54 UTC+1, 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 certainly wouldn't stick insulation up with anything.

I think my first action would be to check the bedroom with an infrared thermometer and, with great care, a candle. Looking for cold spots and draughts.

If, after investigation, you still consider it appropriate to add insulation to the garage ceiling, don't leave it bare. Cover it with plsterboard (or whatever is approved) and fix with the sufficient screws.

On 19/10/2019 19:46, polygonum_on_google wrote:
On Saturday, 19 October 2019 16:00:54 UTC+1, 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 certainly wouldn't stick insulation up with anything.

I think my first action would be to check the bedroom with an infrared thermometer and, with great care, a candle. Looking for cold spots and draughts.

If, after investigation, you still consider it appropriate to add insulation to the garage ceiling, don't leave it bare. Cover it with plsterboard (or whatever is approved) and fix with the sufficient screws.




Pull the garage ceiling down and make sure there are no gaps where the
joists are built into the walls. Seal with firestop mastic if so, then
in place of the fibreglass or whatever they used 25 years ago,
cut 4 inch thick celotex so that it fits *tightly* up against
the bedroom floor and use tile battens to provide extra support.
infill remaining space with whatever fibreglass you pulled out
then add another layer of celotex over the joists (ie.on the
underside), and fit new 15mm fireline plasterboard.

On 19/10/2019 20:21, Andrew wrote:
On 19/10/2019 19:46, polygonum_on_google wrote:
On Saturday, 19 October 2019 16:00:54 UTC+1, Another JohnÂ* 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.

-Â* 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 theÂ* plasterboard was fixed.Â* 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 certainly wouldn't stick insulation up with anything.

I think my first action would be to check the bedroom with an infrared
thermometer and, with great care, a candle. Looking for cold spots and
draughts.

If, after investigation, you still consider it appropriate to add
insulation to the garage ceiling, don't leave it bare. Cover it with
plsterboard (or whatever is approved) and fix with the sufficient screws.



Pull the garage ceiling down and make sure there are no gaps where the
joists are built into the walls. Seal with firestop mastic if so, then
in place of the fibreglass or whatever they used 25 years ago,
cut 4 inch thick celotex so that it fits *tightly* up against
the bedroom floor and use tile battens to provide extra support.
infill remaining space with whatever fibreglass you pulled out
then add another layer of celotex over the joists (ie.on the
underside), and fit new 15mm fireline plasterboard.

Something else just occurred to me. Does this extension have
the same roof line as the original house or did the planners
insist on a 'set back' ?. That being the case are the
bedroom windows dormer-type windows ?. This style of construction
is notoriously leaky where heat is concerned. 25 years ago
the builder probably didn't put any insulation in the dormer
cheeks, and quite possibly little of none above the
ceiling. Retrofitting this is not going to be easy.

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

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.

If the garage is used as such then you should have a 30 min fire break
below the new insulation.

- 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.

You may get a bit of cold bridging on the joists... how much difference
it will make is a harder call. However if the garage is relatively
clear, then its a easy enough job once you have worked out where the
joists are - you can screw through the new PB and the insulation in one
go into the joists to fix it.

- 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!

I helped a friend do a garage conversion some years back. One of the
comments was after the work that the bedroom above was now much warmer
as a result of now having a heated space below.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

Well one assumes that the fact it has three outside walls might be a factor,
even if insulated. I guess I'm thinking that somehow you need to decide if
the cold is actually coming from the unheated garage and not for some other
reason.

Brian

--
----- --
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Another John" wrote in message
...
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