I am planning a screen porch addition with 4/12 gable roof with valleys. When done I plan to re-roof the home and the addition. I have received a number of conflicting opinions regarding the strait edge, metal, or weave methods. I would love to get some input from some expereinced roofers as to which may be best. I lean towards the weave method, but one roofer told me never to use this method with architectual shingles do to their thickness. Your opinions will be greatly appreciated.