ok, I am having an RSJ installed (supported each end on walls) in my loft so I thought this might be a chance to strengthen the existing understrength floor joists them by attaching them to the new RSJ which will sit literally 1 or 2 mm above the joists. I cannot disturb the ceiling that the joists are currently supporting so what method could I use to fix the joists to the RSJ above ?
Thank you.
Thank you.