Top 3 leak points
Dormer Flashing
Dormers with improperly flashed areas are known to be places to leak.
Chimneys
Chimneys are notorious for having leaks. Properly installed flashing around a chimney can ensure water stays outside as it should be!
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Pipe Boots
Pipe boots won't last as long as your shingle does. Rubber being exposed to the elements will break the rubber seal down causing it to have crackes, holes, or both.
Proper Project Management
A good company will ensure someone is there to make sure that proper flashings are installed to maintain a leak-free roofing system!