DuPont home wrap
The use of house wrap under siding is a very useful thing provided it is installed correctly. All joints and openings around doors, windows, etc., should be taped to provide a good tight seal. It will keep the wind from blowing through the walls. Siding is not a perfect seal from air infiltration. The house wrap takes care of any air leaking in around the siding to keep it from entering the house.
I run into this type of thing all the time and it really ticks me off. I am willing to listen to any advice someone may have to offer, but in the end, as long as I am paying the bill, I will decide how to spend the money and there is no room for discussion. Give me what I want for my money or I will find someone who will.
I may have come off a little strong here, but I have strong feelings about this type of thing. Especially when it comes to something that is as large an investment as a house.