Understanding the Different Parts of Your Roofing System
A roofing system integrates deck/sheathing (structural diaphragm, load path), underlayment/ice barrier (secondary water-shedding per ASTM), primary covering (asphalt or metal per slope and ESR), and flashings/sealants (step, valley, counter; galvanic-aware). Proper fastening schedules, panel orientation, and expansion gaps control stiffness and uplift. Ventilation (NFVA 1:150/1:300) and insulation manage moisture/thermal performance. Ridge/hip/valley terminations require backed nailing […]