Tear-Off vs Overlay (Re-roofing Options)

reroof vs full replacement, pros and cons of tear-off, installing shingles over old roof, local code on overlay roofing, roof decking condition considerations, second layer roofing rules, weight concerns with multiple roof layers, insurance coverage overlay vs tear off, warranty issues with overlay roofs, roof tear-off process explained, when not to overlay roof, cost difference tear-off vs overlay, hidden damage under old shingles, ventilation with overlay roofing, lifespan of overlay roofing, overlay vs tear off for resale value, overlay aesthetics comparison, roof flashing and overlays, removing old flashing in reroof, tear-off disposal logistics, multiple roof layers building codes, moisture barrier issues with overlay, shingles not lying flat over old, removing two layers of shingles, underlayment concerns overlay roofing, when overlay is allowed, structural limits with multiple roof layers, roofing nail length for overlays, pros and cons of each method.