Hello,
I'm currently looking at putting some velux-type roof windows in my loft. It's not 'habitable' but used for a bit of storage so with the cost of electricity going through the roof (sorry) I'd thought longer term I'd be better off with some free light.
It would only be one or two small windows but I'd probably need to break into at least one rafter on each window (they're pretty narrow in my roof anyway). For building regs., everything I read talks about the trimmers and enclosing rafters needing to be doubled up. I've been scouring the regs and can't find any reference to this, maybe it is in a British Standard ? Or just some long held practice that's just become adopted ?
Any pointers as to where this originates from much appreciated. Then I can see what actually applies in my situation.
Many Thanks. Simon