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The coaming ( Low German for threshold ) or the coaming is the upright edging of openings in the deck of ships and boats . The hatch coaming or Lukenkumming (for ships), or the Denne tree (as inland waterway vessels) serves to stiffen the hull and provides a distinction from water which washes over the deck.

On smaller boats like kayaks , the coaming is only a few centimeters high. The elastic band of the spraydeck clings to it . On a ship that operates in the open sea, the hatch coaming of the cargo hatches can also be two meters and higher.


  • Detje, Peter (ed.): Shipbuilding for boaters . Eckhardt & Messtorff Verlag, Hamburg 1962.
  • Author collective: Stahlschiffbau . transpress Verlag, Berlin 1989, ISBN 3-341-00410-6 .