Hello,

I have to repair an undersized and badly notched joist 38x175mm sitting in an intermediate floor connected to the ceiling below.

The joist is sagging but also has a slope resulting in a lower level support in the middle of the flat (double span joists).

A metal plate 8x150mm would be bolted but the question is, how to manage the installation? Would the metal plate be leveled with the new sistered joist or aligned to the sagging sloping one? In the ideal world. Flitch beam would have elements connected perfectly matching their sides.

See the attachment. Yellow rectangle representing the new straight timber joist. Red rectangle the existing joist. How would you install the metal plate considering 1) timbers not matching their shape 2) support on the right warped leaving a gap between the new straight joist underside and the old joist directly sitting on the bearer.