Lifting 100kg EPDM roof rolls into place.

[Simplysimon]

scottish building regs, cold deck has lots of issues so it's warm deck up here

[Tony K]

18 hours ago, Simplysimon said:

scottish building regs, cold deck has lots of issues so it's warm deck up here

 

Interesting. I know some of the pro-warm deck arguments, and they all seem sensible (I'd have gone warm deck myself under different circumstances) but am not familiar with such anti-cold deck arguments that would make the good folk of Scotland ban them. 

 

Is it a different reading of the same technical pros and cons, or is it that parts of Scotland literally have a different climate to England that results in such a divergence in the regs? 

 

I'm currently getting my head around the apparent conflict between my cold deck and a vapour barrier, by the way! 

[Simplysimon]

vcl on the warm side of the insulation in both cases. with cold deck if the vcl is not intact then moisture will condense in the roof space, with a warm deck the roof space is warm, so less condensation risk and less risk of rot.

[Tony K]

3 hours ago, Simplysimon said:

vcl on the warm side of the insulation in both cases. with cold deck if the vcl is not intact then moisture will condense in the roof space, with a warm deck the roof space is warm, so less condensation risk and less risk of rot.

 

Absolutely, the case for warm deck is clear and convincing. However, a cold deck van work perfectly well with adequate ventilation.