We are planning to fit a shower tray in our upstairs bathroom, but to reach the waste, I would need to drill through the joists. I am concerned that this would weaken the joists and lead to problems in the future. I have seen that in America, you can buy steel reinforcing plates that have a hole bored in them. I have not been able to find these here: does anyone know whether they are available here anywhere? Alternatively, is there another sound way to reinforce the beams? I am not sure what size they are, but the house was built in the early 50s.
Thank you.
James.
Thank you.
James.