Architect drawings- VCL Airtightness layer in right place? Any input on general detailing.

[dbyter]

Hi, new to the forum and this is my first post. Looks like there is a wealth of information here and in time I hope to be able to contribute something useful back once we are further on with our new build in Shetland. Our architect has just come with the preliminary drawings in preperation for the build warrant submission and I'm wondering if the VCL is in the best place within the makeup for fitting and achieving good airtightness? 

 

Thoughts or input on other aspects of the detailing welcomed.  

 

Thanks, David.

 

[JohnMo]

I would push back on 170mm kingspan between rafters and use a more flexible and very easy to correct mineral wool, something like Rockwool Flexi. Do it thicker to to U values. Same for walls, but you may need to increase the 25mm inside to something a little thicker.

 

Back to your question, it looks fine, well protected. On your 1st floor joists you may need to be wrapped to join the 1st and 2nd floor wall VCL to join.

[ETC]

How are you venting the roof?