Hi, I'm not sure if anyone can help on this but worth an ask.
I am building an extension and we have some bifolding doors we wish to install. To keep the doors as wide as possible we want them as close to the outside wall as possible. The builders said normally the rsj needs to sit on a 15cm nib on either end to support it. The structural engineers have said that on the corner of the house there needs to be a minimum of a 550mm internal return (approx 750mm external return). Apparently this is a building regulations requirement. As the structural engineers originally specified the 550mm return, then said 150mm would be ok and are now back to 550mm I would really like to clarify for myself.
Has anyone come across this before and is this indeed a building regs requirement? If so would anyone be kind enough to point me in the right direction on where I can find this written down?
Many thanks
I am building an extension and we have some bifolding doors we wish to install. To keep the doors as wide as possible we want them as close to the outside wall as possible. The builders said normally the rsj needs to sit on a 15cm nib on either end to support it. The structural engineers have said that on the corner of the house there needs to be a minimum of a 550mm internal return (approx 750mm external return). Apparently this is a building regulations requirement. As the structural engineers originally specified the 550mm return, then said 150mm would be ok and are now back to 550mm I would really like to clarify for myself.
Has anyone come across this before and is this indeed a building regs requirement? If so would anyone be kind enough to point me in the right direction on where I can find this written down?
Many thanks