Builders are adding an extension to the bungalow. The new extension has a cold roof as height is a limitation for other reasons. The roof joins the sloping tiles of the main sloping roof, about 9" higher than the old guttering. I'm not confident that their claim that ventilation is all dealt with is correct. There are vents at the lowest end of the flat roof i.e. in the soffit, but how is ventilation achieved at the other end? I think they mentioned ventilating into the main roof space but that sounds sketchy. How would it normally be done? What complies with regs?
Extension roof meeting main vaulted roof ventilation query.
- Thread starter LindenB
- Start date
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Is the existing roof space vented at the eaves? And is the ventilation gap in your flat roof open to the existing roof void?
Hi.
Thanks for the response. Apparently it would appear the intent was to vent into the main vaulted roof space but as the next phase is a roof conversion that is a no no. In any case it didn't seem quite right.
The design has now been changed and the deck is now spaced off on cross battens and a vented soffet added to the extension sides. The result is that the roof now has ventilation on three external faces. The battens or more than 50mm deep. I guess that will do the job.
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