Insulation to eaves warm roof

[anorakdiyer71]

New kitchen extension which has pitched warm roof.
Do I just need to 'celotex off' between each rafter to stop cold air coming in ??
(as ceilings will just be boarded- no insulation req )

Also above glazing a similar scenario ?? see pics


second image is where eaves are shut off due to box gutter

 

[freddiemercurystwin]

That won't ever be a proper warm roof, to be a warm roof you put insulation above the joists/rafters.

 

[Iwilldoit]

I think in your case you go inbetween rafters with full depth ? celotex of the relevant rating for that position and then also over the rafters from inside with a the correct thickness.
I might be wrong but that is what was done when I hade a build some years ago.

 

[anorakdiyer71]

Ok let’s start again ….
On the outer side of the two pitched sides of the roof is plywood, vapour barrier , 120 celotex, plywood , Sarnafil
So that’s my warm roof .
All I’m checking on is the requirements by the eaves and on the overhang by the triangular glazing , in terms of stopping cold air from the soffits and outside .

 

[anorakdiyer71]

That won't ever be a proper warm roof, to be a warm roof you put insulation above the joists/rafters.

??

 

[catlad]

Yes is the answer to your question, same above the window.