We are familiar with the rough electrical inspection

Our contractor called at the end of the day to discuss a few unexpected costs. He needed to put some two-by-fours in the ceiling to make room for the insulation. “You see,” he said, “because of the way they used to build houses, I have to buy some special fire-proof insulation.”

“Oh, you mean Rock Wool?” I said. Surprised at my intimate knowledge of obscure building materials, he said yes. “I think we have some of that in the attic.”