Cold areas on recently built gable type extension

[GeddyMortgage]

We aways make sure that the eaves insulation detail, transitions to the roof insulation, robustly....

trap1.jpg

• noseall
• 11 Nov 2024

trap2.jpg

• noseall
• 11 Nov 2024

As said, external leaf masonry, ceases at the soffit.

Thanks @noseall looks as i'd expected, and nice and tidy. I've dug out a bunch of photos I took during the building of this extension, hard to verify exactly where there is and isn't insulation and frustratingly can't say for sure if it's in the eaves, but given that other areas look to be at the right height, I'd hope so?

I'll attach them chronologically below anyway for everyone, I wonder if anyone with a more trained eye than me can see anything that would help point to an issue!.

 

[GeddyMortgage]

And the rest of the attachments below.

What do you think?

 

[23vc]

I’d say the heat loss is more a consequence of the large glazed areas, ie. that end wall, plus the big velux’s, (possibly) combined with under sized heating, than the odd spot of missing PIR…does it feel colder/draughty down the end by the doors?

Are the cold spots in your thermal camera image, just in that one spot, or more widespread?

 

[GeddyMortgage]

I’d say the heat loss is more a consequence of the large glazed areas, ie. that end wall, plus the big velux’s

I suspect you're right. Once i've eliminated the possibility of draughts and/orr other easy to fix things, i'm gonna tackle those, it's still possible to change the units to triple glazed, or acoustic ones or whatever. Which is absolutely an option on the table. As is secondary glazing and/or shutters for any of the windows that are in the reveals. Not bothered about cost at this point just want it mega cosy!

…does it feel colder/draughty down the end by the doors?

It doesn't feel draughty, but it can be colderdown that end, to be expected to a degree with such large surface area of glass as you suggested.

Are the cold spots in your thermal camera image, just in that one spot, or more widespread?

More widespread, generally the walls and ceilings are similar temp apart from the odd bit here and there (even on internall walls which I guess is a good sign?!).... anyway, Images below

Window reveal and, area beneath the door / beneath the coir matting are the most frequent purple offenders on the thermal cam. Looks particularly bad round the edges of the window frames??

and one of the high up angled windows we think hasn't had the k glass thermal film thing applied to it, as there's a 3 degree difference in temperature between the left and right angled window, as shown on the image below, that's in hand with the installer though. Hopefully easy for them to rectify.

Only other thing I can think of is, when they ran the gas feed and the flow and returns for the rads and fire etc, they ran them all from the subfloor from the main part of the property to this extension.

I'm wondering if they've left any open channels when they cored through from there into this room, essentially allowing for cold air to be coming in through the airbricks to subfloor then piping into the cavities behind the skirting boards in this room....As the skirts are coming out mega purple on the thermal camera too. Fortunately the sub floor is accessible so im gonna go down there friday and foam up any openings etc.

What do you think?

 

[23vc]

Sounds like you’re on the right track. Interesting about the right vs left glazed units.
Draughts blowing up via subfloor sounds feasible. Another potentially very easy fix, is check where all the window/door frame profiles meet the (plastered) reveal. If it hasn’t got a visible bead of flexible caulk, it’s likely it could have a very small gap and enough to have a draught. Dead easy to caulk it, and see if it improves things.

Camera seems pretty cool, what type is it?

 

[GeddyMortgage]

Sounds like you’re on the right track. Interesting about the right vs left glazed units.
Draughts blowing up via subfloor sounds feasible. Another potentially very easy fix, is check where all the window/door frame profiles meet the (plastered) reveal. If it hasn’t got a visible bead of flexible caulk, it’s likely it could have a very small gap and enough to have a draught. Dead easy to caulk it, and see if it improves things.

Camera seems pretty cool, what type is it?

We noticed the the right angled window had arfefacts on it a few months ago, on closer inspection it looked lik the film had been put on backwards. We complained they took the unit away and told us a new unit had been made, but given the temperature difference, I reckon they just stripped the film off and give us ours back. Thats what the thermal evidence suggests anyway ha.

Yeah we've been caulking gaps between reveals and window frames, i noticed the last couple mm of the reveals was very flexible and some had cracked away, so I broke all that out to find a good couple of mm of hollowness behind, filled with foam and some rockwool, then filled and recaulked. I've done that on one of the window reveals and not the other, it has made an improvement albeit slight.

Other thing I noticed that i thought was odd, was there's no gasket on the inside of the fixed windows were they meet the frame, only external. All the other older windows in my house have gaskets both sides. So wondering if that's another booboo they've made, or maybe by design?

Camera is a FLIR pro, they're an attachment for your smartphone, do them both for android and IOS, think I paid couple hundred quid, has been a god-send for stuff like this, or a nightmare if you have ocd like me