I am planning to put a new roof on after removing the old shingles. I live in Virginia Beach and will be using 40 year architectural shingles on the new roof. The roof is a 12 pitch on one side, and a 6 on the other. I want to have the best protection for the new roof, but do not know if 30 weight is to thick. I will be using a ridge vent system as well. Any help you can give me will be greatly appreciated.