Weathertightness: The Origin of the Problem

• Poor Construction Practices
  • Leaking windows
  • Lack of or improper flashing: roof , deck, cladding junctions
  • Lack of sealants

• Designs that did not consider the 4 D's: deflection, drainage, drying and durability.
  In particular when it came to designing:
  • Solid balustrades
  • Complex roof design
  • Penetrations through the claddings
  • Flat roofs with narrow or no eaves

• Untreated kiln-dried framing timber, which is susceptible to rot when exposed to consistent moisture