Heat reflective double glazed windows

fangio · 31 Jul 2007

Hello,

I recently had some double glazed windows fitted as part of a new extension. They all have a sticker on the window pane which says "Interior side", I am guessing this is the reflective side. However one of the windows was fitted with the sticker on the exterior side, i.e. the stickered "interior side" pane is outside. I told my builder they had obviously made a mistake but they said, no that window was stickered wrongly. I do not trust the builders...so is there anyway to confirm this?

Thanks,
J.

derv1980 · 31 Jul 2007

to be fair i dont think it makes a great deal of difference whichever way you put them in. i dont know about your units but the ones from my work, the pane which faces the inside is 1mm thicker than the outside one.

fangio · 31 Jul 2007

Many thanks for that.

The window in question is a bathroom window and the frosted side is inside, which would mean the frosted glass has the heat reflective treatment, is that the way you would build the windows? I would have thought a company would have a load of clear glass with the "treatment"?

Thanks,
J.

Mw Roofline · 31 Jul 2007

It sounds like the builders are having you at it. With the K glass on the outside, you will be loosing more heat out that window than the other windows in the house.

whoever fitted the windows should have been fensa registered and should have provided you with a certificate.

Luckily the glass can be switched around by removing the internal bead so incase the builders can't be bothered to come back, you could try doing it yourself or call out one of those 'window doctor' people.

philipdayton · 1 Aug 2007

It doesn't actually make any difference if the low e pane is on the inside or the outside, it won't effect the U value of the glazing unit at all.
If i were you and particularly if you've never deglazed a window before, i'd leave it as it is.

There is no point in damaging any beads or paying someone to do something where there is no benefit in doing it!!!!

Mw Roofline · 1 Aug 2007

philipdayton said:
It doesn't actually make any difference if the low e pane is on the inside or the outside, it won't effect the U value of the glazing unit at all.
If i were you and particularly if you've never deglazed a window before, i'd leave it as it is.
There is no point in damaging any beads or paying someone to do something where there is no benefit in doing it!!!!

Philip, I don't understand, if thats the case why do they say 'this side inwards' on stickers and stuff?

noseall · 1 Aug 2007

Mw Roofline said:
Philip, I don't understand, if thats the case why do they say 'this side inwards' on stickers and stuff?

so that you don't end up with some one way and some the other, as the reflective properties of the plain and low e glass are very different and quite noticeable.

philipdayton · 2 Aug 2007

noseall said:
Mw Roofline said:

Philip, I don't understand, if thats the case why do they say 'this side inwards' on stickers and stuff?

Click to expand...

so that you don't end up with some one way and some the other, as the reflective properties of the plain and low e glass are very different and quite noticeable.

Exactly, if say you have a 50/50 split casement side hung next to fixed, if you put the two units in (one with low e external and one internal) aesthetically they would look quite different when viewed from the outside.

Mw Roofline · 15 Mar 2008

philipdayton said:
It doesn't actually make any difference if the low e pane is on the inside or the outside, it won't effect the U value of the glazing unit at all.

I was speaking to a window installer today and he said if the unit was the wrong way round, the U value would be affected. The coating needs to be on the inside to immediately reflect the heat back into the room.

Who is right, you or him, lol

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Heat reflective double glazed windows

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