GeGe

Thanks @Cpd.... I've always thought you need to have through ventilation, i.e ridge vents widely available for other types of material !? I guess Building Control will raise it when we start building? Might have to go down a proprietary metal ridge profile that allows for breathability, if they insist. Nice cladding BTW! P.s did you go for the EDW flashing for your Velux windows?

Hi All, I have just found this thread on the web, I might be late to the party, but hopefully some of you might be able to help? I am building an office above garage with a corrugated metal roof finish. I have a similar roof make up to @Cpd see my pic below. My main problem is, I have an air gap in rafter space above insulation which I will vent via soffit vents but how do I vent it through at ridge? There doesn't seem to be much in the UK market for that. There is only foam fillers to put under ridge to close the gaps, so water doesn't blow up there, but they are they are not breathable. Whereas in the US market where they use metal roofs a lot for residential spaces they have breathable ridge strips, (see pic). Any ideas if I can get anything like this in the UK (although would be hard to match sheet profile exactly). recommendations and comments would be appreciated. Thank you in advance.