You are right, 120mm is not sufficient for the cold roof system, I have just confirmed this on the phone with my building regs contact.
He confirmed your suggestion to append an additional layer of insulation to achieve minimum thickness of 150mm.
I'm grateful for you guys on here, saved me a...
Hi Noseall, thanks for getting back - I'm abit confused though, so you think 120mm is not sufficient enough?
As stated:
- 7*2 joists
- 120mm insulation
--> Remaining air gap once insulation aligns with joists approx 55mm
Opting to apply:
- Expanding foam to any gaps
- Vapor control...
Thanks your input mate, was this recent, I'm told we need to use a vapour membrane layer.
We have 7*2 joists, so 120mm should be sufficient to ensure minimum 50mm air gap - is that the case?
After sorting out our ventilation issue in our flat cold roof, we are now at the point of putting in the insulation.
I am hearing contradicting things at the moment, that we need to use gapotape due to the recent changes in building regs. or can we simply ensure the celotex is cut correctly to...
I think you got it - the slope seems to just stop short. I'll get a piccy, to show you under the hood
Do you reckon it will in essence though shorten the lifespan in the long run?
Updated edit:
Please see the image attached - you're correct it runs short of the final 2 or so joists...
Is...