uPVC windows cold
Davey
you can feel a draught coming from the windows which is likely due to the
cold air from the windows mixing with the warm air as the seals are all
making good contact.
Is it my misguided perception that you shouldn't feel cold air with this
type of glazing? I always thought uPVC glazing was supposed to prevent the
cold from penetrating the windows and making the room cold? Or do we just
have really poor glazing installed?
Thanks
Mike Clarke
It can't prevent the cold from penetrating, just reduce it - or to be
pore precise you reduce the amount of heat being lost through the window.
The consolation is that you would have a colder draught if it wasn't
double glazed.
Tim Watts
My uPVC (very modern) are extremely warm - the frame is warm and the
inner glass pane is surprisingly uncold.
Have you got the trickle vents open?
--
Tim Watts
Dave Liquorice
> Is it my misguided perception that you shouldn't feel cold air with this
> type of glazing?
Misguided correct. Double glazing will just reduce the amount of heat
lost through the glazing unit so the inner pane is far warmer than it
would be on a single glazed window. You will still get some cooling
of the air next to the glass and this will form a slight draft
falling from the window. But nothing like you would have with single
glazing. You don't say where you are but it has been pretty cold for
most of the UK recently with some places being damn cold.
We have had ice form on the inside of the double glazing here on
occasion, admitedly on windows also behind two pairs of curtains.
It might be worth a quick check of the seals. Trap a narrow strip of
paper in them and it should be held in place and not to too easy to
slide along.
--
Cheers
Dave.
Ronald Raygun
> On 20/12/10 19:59, Davey wrote:
>> We have uPVC double glazing fitted throughout the house. In the cold
>> weather you can feel a draught coming from the windows which is likely
>> due to the cold air from the windows mixing with the warm air as the
>> seals are all making good contact.
>>
>> Is it my misguided perception that you shouldn't feel cold air with this
>> type of glazing? I always thought uPVC glazing was supposed to prevent
>> the cold from penetrating the windows and making the room cold? Or do we
>> just have really poor glazing installed?
>
> My uPVC (very modern) are extremely warm - the frame is warm and the
> inner glass pane is surprisingly uncold.
Perhaps you are warming the inner pane. Is there a radiator below it?
Tim Watts
No CH right now. And that observation is in direct comparison to some
older (30 years) ali DG frames with 4mm thermal break.
--
Tim Watts
Davey
> On Mon, 20 Dec 2010 19:59:48 -0000, Davey wrote:
>
>> Is it my misguided perception that you shouldn't feel cold air with
>> this type of glazing?
>
> Misguided correct. Double glazing will just reduce the amount of heat
> lost through the glazing unit so the inner pane is far warmer than it
> would be on a single glazed window. You will still get some cooling
> of the air next to the glass and this will form a slight draft
> falling from the window. But nothing like you would have with single
> glazing. You don't say where you are but it has been pretty cold for
> most of the UK recently with some places being damn cold.
Based in west Shropshire. It has been down to -12deg C a couple of times,
but the cold from the windows is something I've noticed when it's been
warmer than this.
I was concerned that with the house being Persimmon built in 2000, the
quality of the DG would be well below average as the rest of the build is.
> We have had ice form on the inside of the double glazing here on
> occasion, admitedly on windows also behind two pairs of curtains.
Yep, Sunday morning there was an inch of ice at the bottom of the bedroom
window. I can't remember ice being on the window since my folks got rid of
their single glazing in the late eighties.
>> It might be worth a quick check of the seals. Trap a narrow strip of
> paper in them and it should be held in place and not to too easy to
> slide along.
Will give that a go thanks.
It also goes to show the insulative qualities of good curtains. We have a
bay window in the lounge and usually only close the venetian blinds, but the
last week or so we've been closing the curtains which are in the lounge,
rather than around the bay IYSWIM. If you put your hand behind the curtains,
you can really feel the temp difference.
The Natural Philosopher
PeterC
Last winter, I noticed how cold the air was behind the closed vertical
blinds when opening them in the morning. This was unexpected, as vertical
blinds seal about as well as a picket gate.
Having been given an assortment of curtains, I found that som fine net was
just the right drop and sufficient to do all 4 front windows.
There's a very noticeable difference now when opening the blinds. I suppose
that the net just slows down the convection across the window.
--
Peter.
The gods will stay away
whilst religions hold sway