Renovation and Extension = money pit

[Novice Becky]

  On 07/01/2024 at 11:29, Onoff said:

You can make a nod towards cold bridging by internally, airtight taping &  insulating at the window reveals. I used 27mm insulated plasterboard. 

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@Onoff do you think this worked for you? I was thinking about doing something similar. Like you, I have some (15 year old but still) decent windows but they are fitted close to the edge of the external leaf rather than across the cavity.

[Novice Becky]

  On 07/01/2024 at 10:35, Iceverge said:

When adding a cavity wall extension it's difficult to deal with joining to the existing building and you'll have a heat leak here too.

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@Iceverge interested in your post and diagram thank you. I have a similar issue (I can see it in cold weather with a Flir camera). Could it help just to put internal or external insulation in the corners or would I have to insulate the whole wall?