S_P

Sadly no conduit as a cause, nor has the supply been fed from a cold space but appreciate the input.

There is 2 double gangs on 1 wall & another double gang on another wall, they are all like this even though they are 2 seperate walls. On trying to piece this together, I’d say the air is flowing up the outer cavity & over to the inner, whilst the expanding foam was used well on the vertical straps holding the insulated plasterboard, it’s questionable whether the upper & lower horizontals where done quite as good 🤔 I’d put my money on this,I did wonder if the right brick was used internally but that doesn’t seem to be the case. The electrical supply has been fed internally from a socket in the kitchen meaning it’s not coming from wires that have been fed from a cold space. We have actually plugged in child guards for now & sadly it’s not to stop little ones fingers. There is no permanently operating extraction fans.

I didn’t specify an airtight build but I certainly didn’t also sign up to draughts blowing through the outlets on new extension, would anybody be happy with that? I was reassured a number of times through the building process that this extension due to newer regulations compared to the 13 year old house it has been attached to would become the warmest room in the house, it simply isn’t, due to this leaking airflow. This is a video of what I’m talking about, all be it this is when it’s windy outside. IMG_5650.mov

The plan tomorrow is to do exactly that by the electrician & to put expanding foam in the cavity around the boxes. This has only just come about today, thanks for the heads up on the stripping of threads!

So it appears that it’s not such a bad job workmanship wise nor in specification, sealing off around the sockets in the cavity should see an end to the draughts & there won’t be any long term affects.

So as you can see this is a brand new build, I certainly didn’t expect the finished result to have this issue, in my opinion something has been missed out somewhere or done incorrectly even if there is a small hole from a hole drilled for wires that hadn’t been plugged afterwards, is that fair to assume? I have been advised by the company that built the extension that gaskets could be put around the electrical outlets, is this the correct way going forward to resolve the issue? Should I be satisfied with that or would it be considered a quick fix & not dealing with the issue at its root cause? Should I worry about long term issues from something like this if it’s left as it is & gaskets installed as in damp/mould? Thanks again for your input 🙏

Having not really been on site while sheeting out was actually taking place I question whether the 25mm insulation was installed between the strapping, however as the air is still getting there it’s possible to say even if it is/was this may still be happening.

Thanks Bramco, There is s definite difference in the flow of air depending on the strength of the wind outside, your experience sounds similar to what we are now experiencing. So by the plans there "should" have been cavity closers fitted at the top of the inner & outer leaf, having not been present when the roof went on i cannot confirm that these were fitted, certainly in the pics i have up to that point they had not been. If something like this has been fundamentally missed out apart from the obvious of taking it apart does anyone know if there is an easy fix around the air coming through? If there is such a thing. Thanks

Hi, I'm looking for some advice, recently had an extension built & as the topic says i have draughts coming through the sockets, for the most part i kept my eye on the company i chose to do the build but with now having this issue it has made me want to try & understand where the issue has arisen from. I have 2 suspicions ; 1) The 25mm Kingspan Kooltherm insulation between the strapping behind the plasterboard has been left out? The builder states they have pictures to prove it had been installed but i'm still waiting on these. 2) The inner leaf was to be as stated in the planning application 100mm Celcon high strength blockwork, when i look at these online the brick appears much smoother on the surface compared to what i have, i have attached a picture of the build showing the blocks used, i found a delivery note stating "heavy weight blocks 7N", could it be the wrong blocks have been used therefor allowing air to flow more easily through the inner leaf? Everything else from what i can see was carried out correctly. Any advice is much appreciated.