Anobium, It wasn't the ducting that was the issue, it was removing roof tiles then properly installing a roof vent and flashing it in. It was time they were trying to save. You've obviously never worked with a partnering contractor who's guaranteed work for five years. Personally I just don't like partnering contracts, they rarely work to produce cost savings and what you actually do is create a monopoly whereby the contractor knows he can get away with a lot more than he would in the real world.
