Hi,

We've got a bedroom above the garage in our eight year old house which
is always 5 deg C colder (or more) than the rest of the house on cold
days. The fact that the bedroom floor is always cold leads me to
believe the insulation requires significant improvement between the
garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr (Link to groups.google.co.uk)

and this:

http://xrl.us/bg5jt (Link to www.diynot.com)

What I'd like to know is has anyone suffered with this cold room above
garage syndrome, improved the insulation, and actually fixed the
problem? If you have, can you state what you did and what materials
you used please? I can't pull up the flooring as we've just had new
carpet laid but would be prepared to pull down the plaster ceiling if
necessary.

Thanks in advance,

Jon

In article ,
Jon writes:
Hi,

We've got a bedroom above the garage in our eight year old house which
is always 5 deg C colder (or more) than the rest of the house on cold
days. The fact that the bedroom floor is always cold leads me to
believe the insulation requires significant improvement between the
garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr (Link to groups.google.co.uk)

and this:

http://xrl.us/bg5jt (Link to www.diynot.com)

What I'd like to know is has anyone suffered with this cold room above
garage syndrome, improved the insulation, and actually fixed the
problem? If you have, can you state what you did and what materials
you used please? I can't pull up the flooring as we've just had new
carpet laid but would be prepared to pull down the plaster ceiling if
necessary.

Mine has fibreglass (looks like regular loft insulation)
in the gap. There's probably around 6" -- certainly it's
most of the 8" (IIRC) height of the joists. (That's a 1990
house.)

My parents recently had a single storey flat roofed extension
insulated. (Built in 1964, originally just foil backed board
and strawboard roof as insulation. Strawboard had been
replaced with ply.) I wasn't there, but I understand
they took down a strip of plasterboard along the centre
of the room perpendicular to the joists, and slid more
solid fibreglass bats along above the ceiling to the
edges. Ceiling was then repaired and the room was to be
decorated anyway.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On 4 Mar, 10:03, (Andrew Gabriel) wrote:
In article ,
* * * * Jon writes:





Hi,

We've got a bedroom above the garage in our eight year old house which
is always 5 deg C colder (or more) than the rest of the house on cold
days. The fact that the bedroom floor is always cold leads me to
believe the insulation requires significant improvement between the
garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr(Link to groups.google.co.uk)

and this:

http://xrl.us/bg5jt(Link towww.diynot.com)

What I'd like to know is has anyone suffered with this cold room above
garage syndrome, improved the insulation, and actually fixed the
problem? If you have, can you state what you did and what materials
you used please? I can't pull up the flooring as we've just had new
carpet laid but would be prepared to pull down the plaster ceiling if
necessary.

Mine has fibreglass (looks like regular loft insulation)
in the gap. There's probably around 6" -- certainly it's
most of the 8" (IIRC) height of the joists. (That's a 1990
house.)

My parents recently had a single storey flat roofed extension
insulated. (Built in 1964, originally just foil backed board
and strawboard roof as insulation. Strawboard had been
replaced with ply.) I wasn't there, but I understand
they took down a strip of plasterboard along the centre
of the room perpendicular to the joists, and slid more
solid fibreglass bats along above the ceiling to the
edges. Ceiling was then repaired and the room was to be
decorated anyway.

I'm not too worried about the finish as the ceiling is only in the
garage. The trouble is there is already some poor quality loft
insulation in the void and I would have to get that out first before
putting in the rockwool, which could be a problem.

Nice idea about cutting out a strip of plaster though and pushing in
the new insulation. Removing all the plasterboard will be very messy
and I don't fancy it at all, but it needs must ....

Thanks,

Jon

In article ,
Jon writes:

My parents recently had a single storey flat roofed extension
insulated. (Built in 1964, originally just foil backed board
and strawboard roof as insulation. Strawboard had been
replaced with ply.) I wasn't there, but I understand
they took down a strip of plasterboard along the centre
of the room perpendicular to the joists, and slid more
solid fibreglass bats along above the ceiling to the
edges. Ceiling was then repaired and the room was to be
decorated anyway.
I'm not too worried about the finish as the ceiling is only in the
garage. The trouble is there is already some poor quality loft
insulation in the void and I would have to get that out first before
putting in the rockwool, which could be a problem.
Nice idea about cutting out a strip of plaster though and pushing in
the new insulation. Removing all the plasterboard will be very messy
and I don't fancy it at all, but it needs must ....

BTW, the removed strip straddled the nogins, so they could
push the bats up either side to both edges.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

Jon wrote:
On 4 Mar, 10:03, (Andrew Gabriel) wrote:
In article
,
Jon writes:





Hi,

We've got a bedroom above the garage in our eight year old house
which is always 5 deg C colder (or more) than the rest of the house
on cold days. The fact that the bedroom floor is always cold leads
me to believe the insulation requires significant improvement
between the garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr(Link to groups.google.co.uk)

and this:

http://xrl.us/bg5jt(Link towww.diynot.com)

What I'd like to know is has anyone suffered with this cold room
above garage syndrome, improved the insulation, and actually fixed
the problem? If you have, can you state what you did and what
materials you used please? I can't pull up the flooring as we've
just had new carpet laid but would be prepared to pull down the
plaster ceiling if necessary.

Mine has fibreglass (looks like regular loft insulation)
in the gap. There's probably around 6" -- certainly it's
most of the 8" (IIRC) height of the joists. (That's a 1990
house.)

My parents recently had a single storey flat roofed extension
insulated. (Built in 1964, originally just foil backed board
and strawboard roof as insulation. Strawboard had been
replaced with ply.) I wasn't there, but I understand
they took down a strip of plasterboard along the centre
of the room perpendicular to the joists, and slid more
solid fibreglass bats along above the ceiling to the
edges. Ceiling was then repaired and the room was to be
decorated anyway.

I'm not too worried about the finish as the ceiling is only in the
garage. The trouble is there is already some poor quality loft
insulation in the void and I would have to get that out first before
putting in the rockwool, which could be a problem.

Nice idea about cutting out a strip of plaster though and pushing in
the new insulation. Removing all the plasterboard will be very messy
and I don't fancy it at all, but it needs must ....

Is the garage ceiling just plasterboard? Are the garage walls plastered? If
not with all the issues re the garage door, then are you getting a draft
distributed round the edges which funnel under the bedroom skirting around
the edge of the carpet? Are there also gaps around any pipework from the
garage into the ceiling space?

Clot wrote:

Are there also gaps around any pipework from the
garage into the ceiling space?

That would be a bit worrying as a fire barrier.

Chris
--
Chris J Dixon Nottingham UK


Have dancing shoes, will ceilidh.

Chris J Dixon wrote:
Clot wrote:

Are there also gaps around any pipework from the
garage into the ceiling space?

That would be a bit worrying as a fire barrier.

Agreed but I have experienced that in a house (new build) that I purchased
in the late 70s

On 5 Mar, 23:16, "Clot" wrote:
Jon wrote:
On 4 Mar, 10:03, (Andrew Gabriel) wrote:
In article
,
Jon writes:

Hi,

We've got a bedroom above the garage in our eight year old house
which is always 5 deg C colder (or more) than the rest of the house
on cold days. The fact that the bedroom floor is always cold leads
me to believe the insulation requires significant improvement
between the garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr(Linkto groups.google.co.uk)

and this:

http://xrl.us/bg5jt(Linktowww.diynot.com)

What I'd like to know is has anyone suffered with this cold room
above garage syndrome, improved the insulation, and actually fixed
the problem? If you have, can you state what you did and what
materials you used please? I can't pull up the flooring as we've
just had new carpet laid but would be prepared to pull down the
plaster ceiling if necessary.

Mine has fibreglass (looks like regular loft insulation)
in the gap. There's probably around 6" -- certainly it's
most of the 8" (IIRC) height of the joists. (That's a 1990
house.)

My parents recently had a single storey flat roofed extension
insulated. (Built in 1964, originally just foil backed board
and strawboard roof as insulation. Strawboard had been
replaced with ply.) I wasn't there, but I understand
they took down a strip of plasterboard along the centre
of the room perpendicular to the joists, and slid more
solid fibreglass bats along above the ceiling to the
edges. Ceiling was then repaired and the room was to be
decorated anyway.

I'm not too worried about the finish as the ceiling is only in the
garage. The trouble is there is already some poor quality loft
insulation in the void and I would have to get that out first before
putting in the rockwool, which could be a problem.

Nice idea about cutting out a strip of plaster though and pushing in
the new insulation. Removing all the plasterboard will be very messy
and I don't fancy it at all, but it needs must ....

Is the garage ceiling just plasterboard? Are the garage walls plastered? If
not with all the issues re the garage door, then are you getting a draft
distributed round the edges which funnel under the bedroom skirting around
the edge of the carpet? Are there also gaps around any pipework from the
garage into the ceiling space?

The garage ceiling is just plasterboard with no pipework going through
it, the walls are breezeblock. I was thinking of just screwing celotex/
kingspan under the plasterboard ceiling to save on a load of work.
Would that be acceptible and safe?

We had new carpet laid on monday in the room above the garage. Before
it was laid I ripped the old flooring up and sealed under the skirting
with silicone as well as any gaps in the floorboards which were
producing draughts.

Jon

Jon wrote:
On 5 Mar, 23:16, "Clot" wrote:
Jon wrote:
On 4 Mar, 10:03, (Andrew Gabriel) wrote:
In article
,
Jon writes:

Hi,

We've got a bedroom above the garage in our eight year old house
which is always 5 deg C colder (or more) than the rest of the
house on cold days. The fact that the bedroom floor is always
cold leads me to believe the insulation requires significant
improvement between the garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr(Linkto groups.google.co.uk)

and this:

http://xrl.us/bg5jt(Linktowww.diynot.com)

What I'd like to know is has anyone suffered with this cold room
above garage syndrome, improved the insulation, and actually fixed
the problem? If you have, can you state what you did and what
materials you used please? I can't pull up the flooring as we've
just had new carpet laid but would be prepared to pull down the
plaster ceiling if necessary.

Mine has fibreglass (looks like regular loft insulation)
in the gap. There's probably around 6" -- certainly it's
most of the 8" (IIRC) height of the joists. (That's a 1990
house.)

My parents recently had a single storey flat roofed extension
insulated. (Built in 1964, originally just foil backed board
and strawboard roof as insulation. Strawboard had been
replaced with ply.) I wasn't there, but I understand
they took down a strip of plasterboard along the centre
of the room perpendicular to the joists, and slid more
solid fibreglass bats along above the ceiling to the
edges. Ceiling was then repaired and the room was to be
decorated anyway.

I'm not too worried about the finish as the ceiling is only in the
garage. The trouble is there is already some poor quality loft
insulation in the void and I would have to get that out first before
putting in the rockwool, which could be a problem.

Nice idea about cutting out a strip of plaster though and pushing in
the new insulation. Removing all the plasterboard will be very messy
and I don't fancy it at all, but it needs must ....

Is the garage ceiling just plasterboard? Are the garage walls
plastered? If not with all the issues re the garage door, then are
you getting a draft distributed round the edges which funnel under
the bedroom skirting around the edge of the carpet? Are there also
gaps around any pipework from the garage into the ceiling space?

The garage ceiling is just plasterboard with no pipework going through
it, the walls are breezeblock. I was thinking of just screwing
celotex/ kingspan under the plasterboard ceiling to save on a load of
work. Would that be acceptible and safe?

I cannot answer the issue re acceptability of celotex. Are there gaps
between the walls and the plaster ceiling which would letting cold air get
upstairs?


We had new carpet laid on monday in the room above the garage. Before
it was laid I ripped the old flooring up and sealed under the skirting
with silicone as well as any gaps in the floorboards which were
producing draughts.

Good, that's a help.

"Jon" wrote in message
...
Hi,

We've got a bedroom above the garage in our eight year old house which
is always 5 deg C colder (or more) than the rest of the house on cold
days. The fact that the bedroom floor is always cold leads me to
believe the insulation requires significant improvement between the
garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr (Link to groups.google.co.uk)

and this:

http://xrl.us/bg5jt (Link to www.diynot.com)

What I'd like to know is has anyone suffered with this cold room above
garage syndrome, improved the insulation, and actually fixed the
problem? If you have, can you state what you did and what materials
you used please? I can't pull up the flooring as we've just had new
carpet laid but would be prepared to pull down the plaster ceiling if
necessary.

Thanks in advance,

Jon


Mine has always been warm even though the long wall is north facing

Ceiling of garage is 2 x half inch plasterboard to give required fire
protection ( built in 1991 to regs current at the time)

space between ceiling and floor above filled with 6" fibreglass

interior walls thermalite blocks cavity filled with rockwool bats

Ceiling of room standard plasterboard 6" fibreglass above boarded over for
storage


Tony

Jon wrote:
Hi,

We've got a bedroom above the garage in our eight year old house
which is always 5 deg C colder (or more) than the rest of the house
on cold days. The fact that the bedroom floor is always cold leads me
to believe the insulation requires significant improvement between
the garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr (Link to groups.google.co.uk)

and this:

http://xrl.us/bg5jt (Link to www.diynot.com)

What I'd like to know is has anyone suffered with this cold room
above garage syndrome, improved the insulation, and actually fixed
the problem? If you have, can you state what you did and what
materials you used please? I can't pull up the flooring as we've just
had new carpet laid but would be prepared to pull down the plaster
ceiling if necessary.

Possibly not quite the approach you were thinking of - but have you
considered a new mattress?

We changed mattress a while ago and the difference in warmth is amazing.
The one we got has a hefty layer of warm material where the old one
let a breeze through. I haven't used a winter weight duvet this winter -
at all.

The room itself might still freeze (ours is not over a garage) but that
is less of a problem when we are toasty warm in bed.

--
Rod

On 4 Mar, 13:18, Rod wrote:
Jon wrote:
Hi,

We've got a bedroom above the garage in our eight year old house
which is always 5 deg C colder (or more) than the rest of the house
on cold days. The fact that the bedroom floor is always cold leads me
to believe the insulation requires significant improvement between
the garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr(Link to groups.google.co.uk)

and this:

http://xrl.us/bg5jt(Link towww.diynot.com)

What I'd like to know is has anyone suffered with this cold room
above garage syndrome, improved the insulation, and actually fixed
the problem? If you have, can you state what you did and what
materials you used please? I can't pull up the flooring as we've just
had new carpet laid but would be prepared to pull down the plaster
ceiling if necessary.

Possibly not quite the approach you were thinking of - but have you
considered a new mattress?

We changed mattress a while ago and the difference in warmth is amazing.
* The one we got has a hefty layer of warm material where the old one
let a breeze through. I haven't used a winter weight duvet this winter -
at all.

The room itself might still freeze (ours is not over a garage) but that
is less of a problem when we are toasty warm in bed.

The room itself is used as a study so nobody sleeps in there, but it
would be nice if I could get the room to be the same temperature as
the rest of the house by insulating it better.

"Jon" wrote in message
...
On 4 Mar, 13:18, Rod wrote:
Jon wrote:
Hi,

We've got a bedroom above the garage in our eight year old house
which is always 5 deg C colder (or more) than the rest of the house
on cold days. The fact that the bedroom floor is always cold leads me
to believe the insulation requires significant improvement between
the garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr(Link to groups.google.co.uk)

and this:

http://xrl.us/bg5jt(Link towww.diynot.com)

What I'd like to know is has anyone suffered with this cold room
above garage syndrome, improved the insulation, and actually fixed
the problem? If you have, can you state what you did and what
materials you used please? I can't pull up the flooring as we've just
had new carpet laid but would be prepared to pull down the plaster
ceiling if necessary.

Possibly not quite the approach you were thinking of - but have you
considered a new mattress?

We changed mattress a while ago and the difference in warmth is amazing.
The one we got has a hefty layer of warm material where the old one
let a breeze through. I haven't used a winter weight duvet this winter -
at all.

The room itself might still freeze (ours is not over a garage) but that
is less of a problem when we are toasty warm in bed.

The room itself is used as a study so nobody sleeps in there, but it
would be nice if I could get the room to be the same temperature as
the rest of the house by insulating it better.

I wonder if the loose fill rockwool cavity insulation (the stuff that is
blown in) could be used in the same way to fill between the floors

would just be a few smallish holes in the ceiling to deal with

Tony

may be worth asking a company what they think

On 4 Mar, 14:45, "TMC" wrote:
"Jon" wrote in message

...
On 4 Mar, 13:18, Rod wrote:





Jon wrote:
Hi,

We've got a bedroom above the garage in our eight year old house
which is always 5 deg C colder (or more) than the rest of the house
on cold days. The fact that the bedroom floor is always cold leads me
to believe the insulation requires significant improvement between
the garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr(Linkto groups.google.co.uk)

and this:

http://xrl.us/bg5jt(Linktowww.diynot.com)

What I'd like to know is has anyone suffered with this cold room
above garage syndrome, improved the insulation, and actually fixed
the problem? If you have, can you state what you did and what
materials you used please? I can't pull up the flooring as we've just
had new carpet laid but would be prepared to pull down the plaster
ceiling if necessary.

Possibly not quite the approach you were thinking of - but have you
considered a new mattress?

We changed mattress a while ago and the difference in warmth is amazing.
The one we got has a hefty layer of warm material where the old one
let a breeze through. I haven't used a winter weight duvet this winter -
at all.

The room itself might still freeze (ours is not over a garage) but that
is less of a problem when we are toasty warm in bed.

The room itself is used as a study so nobody sleeps in there, but it
would be nice if I could get the room to be the same temperature as
the rest of the house by insulating it better.

I wonder if the loose fill rockwool cavity insulation (the stuff that is
blown in) could be used in the same way to fill between the floors

would just be a few smallish holes in the ceiling to deal with

Tony

may be worth asking a company what they think-

I have considered this option, but for it to work properly I'd still
need to remove the existing insulation which is in place which would
involve cutting plasterboard out. If I'm having to cut plasterboard
out, I might aswell use rockwool slabs as it would be more insulative.
I'm sure someone would be able to confirm or not though.

Thanks,

Jon

"Jon" wrote in message
...

We've got a bedroom above the garage in our eight year old house which
is always 5 deg C colder (or more) than the rest of the house on cold
days. The fact that the bedroom floor is always cold leads me to
believe the insulation requires significant improvement between the
garage ceiling and bedroom floor.

This may be a deeply unfashionable thing to suggest, and may be highly
offensive to some regulars on this group, but I'll say it anyway:

Have you considered putting a bit more heat into the room? Is the
radiator at the same temperature (in and out) as the others in the
house? Does it have a thermostatic valve, and if so, is it set and
working correctly? Could you put a suitably controlled larger radiator
in, or substitute a double for a single?

Depending on how long you intend to live there, and how much of the day
you need the room to be warm, it may even be more cost-effective than
buying lots of insulation. A quick look at the calculations for the
system I've just put in suggests that the most heat loss you could hope
to save would be perhaps a couple of hundred watts.

There, I've said it.

At least you say you've got a carpet in there, which will help: better
than a solid-copper-with fins-underneath floor, or whatever is
fashionable today.


--
Kevin Poole
**Use current month and year to reply (e.g. )***

On 4 Mar, 17:30, "Autolycus" wrote:
"Jon" wrote in message

...

We've got a bedroom above the garage in our eight year old house which
is always 5 deg C colder (or more) than the rest of the house on cold
days. The fact that the bedroom floor is always cold leads me to
believe the insulation requires significant improvement between the
garage ceiling and bedroom floor.

This may be a deeply unfashionable thing to suggest, and may be highly
offensive to some regulars on this group, but I'll say it anyway:

Have you considered putting a bit more heat into the room?


Is the
radiator at the same temperature (in and out) as the others in the
house?

Yes

Does it have a thermostatic valve, and if so, is it set and
working correctly?

Yes, and it works fine. The rad gets as hot as the rest in the house.

Could you put a suitably controlled larger radiator
in, or substitute a double for a single?

It's already a double. Larger rad = more load on boiler which is only
just the right size for a 4 bed house (cheap ass persimmon).

Depending on how long you intend to live there, and how much of the day
you need the room to be warm, it may even be more cost-effective than
buying lots of insulation. A quick look at the calculations for the
system I've just put in suggests that the most heat loss you could hope
to save would be perhaps a couple of hundred watts.

You're not wrong. And I intend staying here for quite a while yet.

The floor will always be cold in the room as long as the lack of
insulation between the garage and the room above allows it. No matter
how much heat I throw in, the garage below will act as a heat sink.

Maybe I'd be better off insulating the garage. But the garage door has
so many gaping holes letting cold air in through the gap between the
frame that it'd not be cost effective either unless I changed the door
(expensive).



There, I've said it.

At least you say you've got a carpet in there, which will help: better
than a solid-copper-with fins-underneath floor, or whatever is
fashionable today.

I'm just looking for a sensible solution to the problem.

Thanks for your reply.

"Jon" wrote in message
...
On 4 Mar, 17:30, "Autolycus" wrote:
"Jon" wrote in message

...

We've got a bedroom above the garage in our eight year old house
which
is always 5 deg C colder (or more) than the rest of the house on
cold
days. The fact that the bedroom floor is always cold leads me to
believe the insulation requires significant improvement between the
garage ceiling and bedroom floor.


snip

Could you put a suitably controlled larger radiator
in, or substitute a double for a single?

It's already a double.

With fins?

Larger rad = more load on boiler which is only
just the right size for a 4 bed house (cheap ass persimmon).

Is the boiler really running flat out, firing continuously, even on a
very cold day? I'd be surprised if the builder had calculated it that
closely. Older boilers can often have their maximum gas rate tweaked
(within defined limits, of course). Is it at its maximum rate?


Depending on how long you intend to live there, and how much of the
day
you need the room to be warm, it may even be more cost-effective than
buying lots of insulation. A quick look at the calculations for the
system I've just put in suggests that the most heat loss you could
hope
to save would be perhaps a couple of hundred watts.

You're not wrong. And I intend staying here for quite a while yet.

The floor will always be cold in the room as long as the lack of
insulation between the garage and the room above allows it. No matter
how much heat I throw in, the garage below will act as a heat sink.

It's true that insulating the floor will raise the temperature of its
upper surface, but I'm suggesting it may not be enough to raise the room
temperature much. The world acts as a heat sink for your roof and
walls, too, but you design accordingly. The energy transferred through
the floor is a largely function of its area, its thermal resistance, and
the temperature difference between the room and the garage. The thermal
resistance is the sum of the resistance of the elements of the floor,
including the surface effect. Unless the garage has a howling gale
through it, your bedroom floor is therefore no different to the
suspended timber ground floors found in many houses.

So do the sums: you'll find a range of values suggested for the thermal
conductivity of suspended floors, but take a sensible stab at it, and
play with the effect of different values of added insulation. Then
compare the cost with that of providing extra heat input, even if you
have to use supplementary heating occasionally.

Maybe I'd be better off insulating the garage. But the garage door has
so many gaping holes letting cold air in through the gap between the
frame that it'd not be cost effective either unless I changed the door
(expensive).

Insulate it iff you want a warmer garage for other reasons. Even if
insulating it pushed its temperature up 5 degrees, it will only make
perhaps 100W difference to the heat loss from the room, so perhaps a
degree or two to the room temperature.


--
Kevin Poole
**Use current month and year to reply (e.g. )***

On 4 Mar, 19:29, "Autolycus" wrote:

We've got a bedroom above the garage in our eight year old house
which
is always 5 deg C colder (or more) than the rest of the house on
cold
days. The fact that the bedroom floor is always cold leads me to
believe the insulation requires significant improvement between the
garage ceiling and bedroom floor.

snip

Could you put a suitably controlled larger radiator
in, or substitute a double for a single?

It's already a double.

With fins?

Yep, it has fins.

Larger rad = more load on boiler which is only
just the right size for a 4 bed house (cheap ass persimmon).

Is the boiler really running flat out, firing continuously, even on a
very cold day? I'd be surprised if the builder had calculated it that
closely. Older boilers can often have their maximum gas rate tweaked
(within defined limits, of course). Is it at its maximum rate?

Fair point, but the boiler already works hard to get the temperature
up. Thankfully the rest of the house is reasonably well insulated (as
you would like to expect for a house of this age) and the boiler will
not need to fire again for quite a while due to heatloss. I'm not
going to mess with the gas rate.


snip

It's true that insulating the floor will raise the temperature of its
upper surface, but I'm suggesting it may not be enough to raise the room
temperature much. The world acts as a heat sink for your roof and
walls, too, but you design accordingly.

I understand the basic physics of heat transfer and the fact that any
form of energy will want to take the path of least resistance to reach
a lower value. The most fundamental thing I also realise is that these
days, the houses which are bulk built by the big boys of the housing
estates like mine will only pay the minimum necessary to get a house
to stand up, pass the regs, and sell. That means using materials which
might be lesser to the ones we would choose.


So do the sums:
snip
Then
compare the cost with that of providing extra heat input, even if you
have to use supplementary heating occasionally.

Again, your point is simple and correct. Over time it'll probably be
cheaper to add supplemental heating. But sometimes, if a job's worth
doing, it's worth doing right. The concept of supplimental heating
doesn't give me that fuzzy feeling inside. I'll always feel like I
should have done the job properly.

This discussion is of great interest. But I'm still waiting for
someone to actually reply with "I've done to my house and it was/
wasn't worth the effort" which would prove or disprove if the job's
worth pursuing.

Thanks for everyones replies so far.

Jon

why not leave the insulation which is there,
though you say its not very good,
and add another layer
on top of or below it?

(depending on height of rooms)


george

Jon wrote:

Maybe I'd be better off insulating the garage. But the garage door has
so many gaping holes letting cold air in through the gap between the
frame that it'd not be cost effective either unless I changed the door
(expensive).

I'd be inclined to do the garage. OTOH if it's particulary small, you'll
probably not be able to open car doors when you've lost 6" or so off the
walls for insulation. Could you not use foam tape around the door?

On 4 Mar, 22:37, "Doki" wrote:
Jon wrote:
Maybe I'd be better off insulating the garage. But the garage door has
so many gaping holes letting cold air in through the gap between the
frame that it'd not be cost effective either unless I changed the door
(expensive).

I'd be inclined to do the garage. OTOH if it's particulary small, you'll
probably not be able to open car doors when you've lost 6" or so off the
walls for insulation. Could you not use foam tape around the door?

I think I'll start off with some 50mm celotex on the back of the
garage door and insulate any draughts coming through the gaps at the
side this weekend.

Is there any reason why I can't just attach a layer of celotex over
the plastered ceiling in the garage? I know it won't be as pretty as
white plasterboard, but the flame retardent barrier would still be in
tact, albeit covered with celotex. It will also save me a lot of work
removing/replacing plasterboard yet provide a thermal barrier between
the garage and room above.

Paul Matthews wrote:
Jon wrote:

Hi,

We've got a bedroom above the garage in our eight year old house
which is always 5 deg C colder (or more) than the rest of the house
on cold days. The fact that the bedroom floor is always cold leads
me to believe the insulation requires significant improvement
between the garage ceiling and bedroom floor.

I have not looked at the threads you mention, but remember that heat
rises.

Hot air does.