Reinforce 2x6 joists with steel strap
Redoing a 7x13 kitchen in a 1930's bungalo and the 2x6 joists 16" oc 13' span are not stiff (foot-o-meter) enough to support tile that the wife wants. Adding insult, a plumber in the past notched 5 of the joists about 5' from one end to clear a 3/4" pipe - so the joists have a "double sag", middle and at the notch point.
Came across the steel strap solution in two posts
Would Simpson SD fasteners be ok? Prefer them to conventional since they have a hex head - easier to install and can be torqued evenly. I can't tell if the shoulder is larger than the threads to make for an interference fit in the straps.
Would double strapping the area under the notch make sense?
Sistering is not an option - too many mechanicals in the way.