Waterproof decks – blocked drainage outlets


Listed under: Exterior, membranes, balconies, decks

Cause

Debris obstructs water flow

Repair

  • remove obstructions from the drainage outlet

Cause

The drainage outlet is not large enough for the volume of water the deck/balcony receives

Repair

  • enlarge the drainage outlet
  • add a second drainage outlet if there is only one outlet. A fully enclosed deck should have at least two drainage outlets with independent overflows
  • ensure that the drainage outlet is at least 50 mm below deck level
  • remove a solid balustrade and replace with an open balustrade on at least one side of the deck