Framing outline is visible on the cladding on cold mornings

Cause

Condensation is forming on cladding where there is insufficient or no insulation – when walls are uninsulated or have insufficient insulation, the area of cladding between the wall framing may become colder than where the cladding is fixed to the framing resulting in condensation forming on the cladding in a pattern. 

Repair

  • clean walls to remove any moss or mould growth and reduce patterning staining
  • insulate the walls when renovating the house. Retrofitting wall insulation requires a building consent

Cause

Condensation forming at the framing locations when the wall is well insulated - this means that, due to thermal bridging, the framing is colder at the framing locations than where there is no framing, so moisture condenses at the framing locations 

Repair

  • if the house is well insulated this is not necessarily a problem if the walls are washed down on a regular basis
  • clean walls to remove any moss or mould growth and reduce patterning staining