Tenant Doing work?

[Sam G.]

Currently I'm having a new shower put in because the old one failed and is leaking down to the basement. Also some rotted wood framing in that area being replaced. Tenant's brother called me saying he was told they would not be putting insulation in the shower walls because it's already insulated from the other side. Siding exterior btw. He questioned how much I trusted these guys and that he does this for a living and that's not how you do things and that he felt bad for his sister having to go through this and dust everywhere. 

I told them it will be a 3 day job. This surprised me as well but I'm trying to take care of it. I don't know how to answer the insulation thing. Tell her they think I don't need it so it won't be put up? I don't want to tell him I'm remotely thinking of hiring him for future stuff. I could see a tenant breaking stuff just to hire her brother. Does anybody know if I need insulation there and just insist they put it in?

Also do you go into a tenant's property for repairs when they are not there for an emergency repair?