My husband and I are building a contemporary modernist house but try to avoid a flat roof because of its potential problems in the New England winters with heavy loads of snow and ice. Our architect has designed sloped roofs with a low pitch or 1.5 inches per foot. My husband is not sure if this is sufficient pitch in order to avoid leaks in the long run. Unfortunately, in our area is no house with a low pitch or a roofer with non-traditional roofing clients. We are planning on using a mechanically fastened standing seam metal roof.
Any advice is greatly appreciated.