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Leaks in a dormer almost always occur at connections, not from penetrations of the roofing material itself. The most vulnerable points are lead flashing, window frame connections, and the roof edge.

Hoofdgids · 13 min lezenVeelvoorkomende problemen bij dakkapellen
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Top causes

  1. Torn or poorly installed lead flashing.
  2. Clogged rainwater drainage: water overflows the upstand.
  3. Connection between the window frame and the side cheek detaching.
  4. Roof trim without expansion joints that has cracked.