Why do my roof tiles keep slipping?
Tiles slip when whatever was holding them has failed: a snapped nib on a clay pantile, a rusted nail, a rotten batten or a mortar bed at the verge or ridge that has washed out. Wind off The Wash finds the weak ones first, which is why it happens in the same few weeks each winter. Re-fixing the slipped tile is the repair; working out why it slipped is what stops the next one.
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