An inspector's opinion seems like an unreliable guideline to me.We are required to describe the wiring method, why not the material too? Add the plumbing material and the foundation materials if you must. My relative in Ontario sold a house and signed a disclosure form. She was not aware of Al wiring in the home, having never worked on it in 6 years or so. So realtor said just answer No then. The buyer's home inspector missed the Al branch circuit wiring and the buyers moved in. They had a spark show in the garage and discovered the Al about 3 months later, went to court and won a cash settlement from my relative, who was completely bewildered by the whole mess. Realtor and home inspector were never implicated. She had a crappy lawyer, no doubt. But the point is, Al wiring is serious, and whether it is a problem or not, the home owners need to know about it. Home inspectors open the panel and see it, and they are the only people who know it is there sometimes.