I've met a couple contractors now. At this point the consensus is that it would be less expensive to redo the whole house siding, then repair existing. It sounds like we're looking at cedar shingles with either Tyvek or tar paper weather barrier. If we go with shingles, what amount should be exposed to weather? One third? The contractors are trying to be competitive, but I want the longest lasting job. What exposure - 5", 6"? What should I ask for in nails used? What range of prices are we looking at for a 2 story, 17+ square shingle job?