Just confirming that I understand correctly: Through-fastened metal roofing can be attached through 1x3 purlins over foam sheathing, correct? I am about to start building an 8x20 "tiny house" and am sold on this method of roof insulation, but شركات عزل الاسطح بالدمام I'm struggling to keep my build weight low enough for my trailer. So if possible, it seems best to use purlins on my house, rather than another layer of (heavy) sheathing. (I plan on using 2" of polyiso on top of my structural sheathing.)http://tinyurl.com/hf22aun Specify that the following be submitted: Demonstration of specified contractor qualifications, manufacturer review letter, manufacturer inspection reports, certification reports demonstrating شركة عزل اسطح بالدمام that materials comply with referenced standards, certificates of analysis (when specified), and documentation demonstrating enrollment in the MBMA certification program (when specified). http://ow.ly/F9RM300jEw7 One of the many advantages of steel buildings is their energy efficiency. https://elwadelsadek.com/%D8%B4%D8%B1%D9%83%D8%A9-%D8%B9%D8%B2%D9%84-%D8%A7%D8%B3%D8%B7%D8%AD-%D8%A8%D8%A7%D9%84%D8%AF%D9%85%D8%A7%D9%85/ When properly built, a steel building is remarkably weather-tight and energy efficient, which keeps your heating and cooling costs low. While شركات عزل الاسطح بالدمام it's entirely possible to use a steel storage building without a heating or cooling system, installing one can keep your space comfortable during extreme temperatures and prevent damage to your belongings.