Timber slat decks – moss/mould/lichen growing on decking

Cause

Insufficient cleaning

Repair

  • wash decking with water and a stiff bristle brush – use a mild detergent or a solution of 1 part household bleach to 4 parts water if necessary to remove moss, then rinse off thoroughly
  • clean with fungicidal wash to sterilise the surface, particularly before painting

Cause

The deck or balcony is continuously damp because of heavy planting, overhanging trees or a nearby steep bank

Repair

  • wash decking with water and a stiff bristle brush – use a mild detergent or a solution of 1 part household bleach to 4 parts water if necessary to remove moss, then rinse off thoroughly
  • clean with fungicidal wash to sterilise the surface, particularly before painting
  • cut back plants or overhanging trees

Cause

The deck is continuously wet from an overflowing gutter or pipe

Repair

  • wash decking with water and a stiff bristle brush – use a mild detergent or a solution of 1 part household bleach to 4 parts water if necessary to remove moss, then rinse off thoroughly
  • clean with fungicidal wash to sterilise the surface, particularly before painting
  • fix the overflowing gutter or pipe, or re-direct the water away from the deck