Painted timber weatherboards – paint failure at base of walls

Cause

Cladding covered by soil/foliage

Repair

  • remove soil/foliage covering cladding
  • cut out and replace rotted timber; ensure there is at least a 100 mm gap to paved ground and 175 mm gap to unpaved ground to prevent moisture uptake
  • scrape and/or sand off loose paint; sand bare timber until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with at least two coats of semi-gloss or high gloss acrylic paint
  • where it is suspected that the building may be leaking and there is a risk of damage behind the cladding, engage an experienced building surveyor to report on the building
  • caution: old layers of paint may contain lead. Lead can be a health hazard if fumes, dust or paint fragments are swallowed or breathed in. For more information see Health and safety: lead-based paint

Cause

The back surface of boards is too close to the ground, not sealed and absorbing moisture

Repair

  • cut out and replace rotted timber; ensure there is at least a 100 mm gap to paved ground and 175 mm gap to unpaved ground to prevent moisture uptake
  • scrape and/or sand off loose paint; sand bare timber until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with at least two coats of semi-gloss or high gloss acrylic paint
  • where it is suspected that the building may be leaking and there is a risk of damage behind the cladding, engage an experienced building surveyor to report on the building 
  • caution: old layers of paint may contain lead. Lead can be a health hazard if fumes, dust or paint fragments are swallowed or breathed in. For more information see Health and safety: lead-based paint

Cause

Concrete has been placed up to and against cladding

Repair

  • break up and remove concrete that sits against the cladding
  • cut out and replace rotted timber; ensure there is at least a 100 mm gap to paved ground and 175 mm gap to unpaved ground to prevent moisture uptake
  • scrape and/or sand off loose paint; sand bare timber until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with at least two coats of semi-gloss or high gloss acrylic paint
  • where it is suspected that the building may be leaking and there is a risk of damage behind the cladding, engage an experienced building surveyor to report on the building 
  • caution: old layers of paint may contain lead. Lead can be a health hazard if fumes, dust or paint fragments are swallowed or breathed in. For more information see Health and safety: lead-based paint

Cause

There are high sub-floor moisture levels behind the cladding

Repair

  • cut out and replace rotted timber; ensure there is at least a 100 mm gap to paved ground and 175 mm gap to unpaved ground to prevent moisture uptake
  • scrape and/or sand off loose paint; sand bare timber until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with at least two coats of semi-gloss or high gloss acrylic paint
  • where it is suspected that the building may be leaking and there is a risk of damage behind the cladding, engage an experienced building surveyor to report on the building
  • caution: old layers of paint may contain lead. Lead can be a health hazard if fumes, dust or paint fragments are swallowed or breathed in. For more information see Health and safety: lead-based paint

Cause

The bottom of the cladding is too close to a waterproof deck surface, apron flashing and absorbing moisture  

Repair

  • cut out and replace rotted timber; ensure there is at least a 100 mm gap to paved ground and 175 mm gap to unpaved ground to prevent moisture uptake
  • scrape and/or sand off loose paint; sand bare timber until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with at least two coats of semi-gloss or high gloss acrylic paint 
  • where it is suspected that the building may be leaking and there is a risk of damage behind the cladding, engage an experienced building surveyor to report on the building
  • caution: old layers of paint may contain lead. Lead can be a health hazard if fumes, dust or paint fragments are swallowed or breathed in. For more information see Health and safety: lead-based paint