Solar Dead-Load & Truss Capacity Analyzer

Solar weight isn't evenly distributed; it's concentrated at the mounting 'L-feet.' On a hot day, this point-load can crush the shingle mat and lead to 'thermal pumping' leaks. Always spec premium flashing kits (like Quick Mount PV) to bridge the point-load across the rafter and preserve the shingle's integrity.

Most jurisdictions require a structural engineer's seal (PE Stamp) if the cumulative dead load exceeds standard code limits (typically 20–30 PSF). If you're mounting solar on an existing tile roof in a snow region, the 'Live Load' + 'Dead Load' often exceeds truss capacity, necessitating structural sistering before the install can proceed.