I am currently planning an extension to my house. I have to support some of the floor joists with a beam but, for continuity of the ceiling, I would like to lap the joists into the beam. Is there a limit as to the width of beam I need to cut the joists into?
The longest joist span is 4.5m.
Also, do I need two layers of plasterboard over the ceiling for fire protection, or will one surfice.
Thanks in advance
Pen
The longest joist span is 4.5m.
Also, do I need two layers of plasterboard over the ceiling for fire protection, or will one surfice.
Thanks in advance
Pen