We have an attic that we are thinking about converting into a closet. the remodeler says 2x10 floor joists will have to be added alongside the existing 2x6's. currently, there are several wires running on top of the existing 2x6's. the remodeler said they would simply notch into the top of the new floor joists, lay the wires into the notches and then place steel plates over the nothches to protect the wires. Is that OK? He's not an eletrician. we are trying to see how much the attic renovation costs, and if some major rewiring needs to be done rather than what the remodeler is telling us, we'ed like to figure it in. Thanks.