I am getting ready to start a house project. The house is about 4k sq ft. They removed all the sheetrock because of the asbestos in it. Now they want to get everything grounded. The house has the old silver romex with no ground, however the kitchen is grounded. I'm not sure when the house was built. It has a 200a ite breaker panel with main fuses.

I was planning on running a ground wire throughout the structure to ground everything. I would love to rewire it and probably could if I advised it, however the existing wire is in good shape and I don't want to oversell it.

However, most of the upstairs of the house is 2x10 ceiling rafters to the roof. They are going to put spray insulation in the rafters. Is this older wire okay to be covered with this insulation? I don't see a problem but want to get a second opinion.