rosswilliams21

Russle - do the foil backed boards not act as a VCL if I use foil tape of the joints and rafter? regarding ridge vents then it may be a case of asking BCO, I can just jump up and fit a dry ridge system when i fit the velux so its not a massive inconvenience but I would rather not if I didnt have to. Thanks for the advice really appreciate it

Brilliant thanks mike your a star, I should be able to provide a continuous gap from pitch to pitch and will aim to put an wedge in the starking at the bottom and top of the pitch between each rafter.

Thanks guys, so I just need to wedge the starking open? does this mean i do not require a gap at the ridge and can insulate it fully?

Also just noticed I have posted in the introduce yourself section! so hi i'm Ross - 26 years old and have been consistently renovating my first house since 2016

Hi guys, currently converting my loft conversion - 1965 semi with a cut roof. and I have some questions around the ventilation between the non-breathable felt and foil backed insulation. I have bulked out the current 4x2 rafters with 4x2 and will be filling the void with 150mm celotex PIR and leaving the 50mm ventilation gap. I am wondering whether I will require a ridge vent or will it be sufficient to leave a 50mm continuous gap including under the ridge ridge so the 50mm runs from one side of the rood to the other? I imagine this may be seen a a silly question, but every day is a school day. Thanks in advance