Roof systems last a long time. Some last longer than others, but why? RoofPointTM, the Guideline for Environmentally Innovative Nonresidential Roofing, provides a number of ideas about improving durability and longevity of a roof system.
First, proper roof system design and installation start with code compliance. Roofs need to meet the minimum requirements for weather protection, performance, fire resistance, materials and coverings, insulation and re-roofing listed in the minimum requirements for weather protection, performance, fire resistance, materials and coverings, insulation and re-roofing listed in Chapter 15 of the International Building Code or Chapter 9 of the International Residential Code. Code requirements are legal minimums; there are many ways to design and install roofs well above the minimum legal requirements. Here are some ideas.