Why do I have water stains on my ceiling after heavy rain?

Four causes hit Myrtle Beach area homes hardest. Wind-driven rain pushing under shingle tabs is the most common, especially in 50-plus mph gusts that break the adhesive seal without lifting shingles visibly. Failed pipe boot flashing comes second; the rubber gasket around your plumbing vents cracks at six to ten years from UV. Chimney and vent flashing corrodes faster within two miles of the ocean because salt eats galvanized metal. Fourth is gutter overflow from pine straw and live oak debris backing water under the drip edge. If the stain only shows up after wind-driven rain, you're looking at wind intrusion. A flashing failure leaks every storm, even in still rain.