Taking up the bathroom floor boards in my home, I was somewhat surprised
that the cowboy who had plumbed the bathroom in for the last owners, had cut
an almost 2 inch deep slot out of the seven inch by three inch joist. The
slots have been made about 2 feet from the wall supporting the joists. This
seems excessive to me to run in two15mm pipes
Should I consider re-enforcing the joist in some way, if so, some
suggestions would be welcome?

TIA
tox