Why is my roof leaking when I can't see any damage?
Most leaks with no visible damage come from a junction, not the tiles: a lead flashing that has lifted, a cracked chimney flaunching, a blocked valley or a ridge that has lost its mortar. Water then tracks along the felt or a rafter and shows up on the ceiling well away from the hole. Finding it means somebody going up and looking, not guessing from the ground.
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