Draughty new double glazing

phil24_7

If you can put a couple of photos up we can properly advise. If there is a gap at the bottom of the window opn the inside then it has not been fitted correctly. The window should sit down on top of the sill with the small lip at the back forming a kind of seal with the window frame. It should not be sealed to the sill as this will stop the window from draining properly. Did the builder fit the windows himself or did he have a window company do them for him?

I had some windows installed in my extension recently and they were installed by a subcontracted window firm who were FENSA registered.

Window and doors will always be cold, even more so if the cavities were not closed properly.

You shouldn't be getting a draught through either but it all depends where this draught is actually coming from.

Regards
Phil

a1b2c3

I can't take any more pictures at the moment, unfortunately, but the draught is unquestionably getting in through the gap in my photo. I can actually see all the way under the window unit to the interior wall, and at night, from outside, I can see points of light from the room inside where there are small gaps between the internal windowsill woodwork and the wall. On the inside, I can feel the draught leaking out around the UPVC trim strips which sit between the lower edge of the window unit and the internal wooden sill.

I think it is clear, from what you and others are telling me, that the outside cill is not fitted correctly; the top of the cill should butt up against the window unit, and it should also be packed correctly underneath, between the lower surface of the cill and the wall. If you look very closely at the photo, just between the points of the arrows I drew, you may just be able to see a faint line, which is a screw sticking down vertically in the cavity. It looks like this is to screw the frame and cill together, but for some reason this has not been done properly.

Thanks again

Bordeuax

hey phil24...the inside should be sealed yes?

phil24_7

Not where the window sits on the sill. They should but up together firmly so no need.

Regards
Phil

EssexExile

Does he intend to lift the sill up to meet the frame when he fills in whatever is under the sill?

a1b2c3

That seems to be the proposal, and I assume that solution might be OK if the window is not supported by the cill and the cill is packed underneath and sealed after lifting.
However, from what I have been reading and viewing on installation videos, there should be a bead of sealant at the back of the cill for the bottom of the frame to rest against, and I now wonder if the builder has applied that.

phil24_7

It's not going to do a massive amount to be honest. You could run a small bead across the back, at the top of the upstand if you desired. The builder may actually run a bead along the sill before he packs it out.

Furts

Ectophile wrote: »

http://ultimatehandyman.co.uk/forum1/download/file.php?id=39340

This looks like a normal concealed drainage gap. To check ,open the casements and pour a little water on the exposed flat surface - there should be some slots there. The water should then drain out of the gap.

This is the detail on my windows and there is nothing unusual about those fitted to my home,

However the gap at the upright is different - I do not have that.