Timber trims – splitting or cupping
Listed under: Exterior, timber and wood-based, timber, cladding, walls, moisture, wall cladding, timber trims
Cause
Thermal expansion and contraction of timber
Repair
- replace damaged boards. If replacement timber is radiata pine, it must be treated to H3.1 and be fully primed before installation (including the back), then given two topcoats of paint. Alternatively, use H3.2 if installed unpainted or stained
- nail with single fixing in the centre of the batten
Cause
Swelling/shrinkage due to moisture absorption
Repair
- replace damaged boards. If replacement timber is radiata pine, it must be treated to H3.1 and be fully primed before installation (including the back), then given two topcoats of paint. Alternatively, use H3.2 if installed unpainted or stained
- nail with single fixing in the centre of the batten
Cause
Back of painted boards not primed
Repair
- replace damaged boards. If replacement timber is radiata pine, it must be treated to H3.1 and be fully primed before installation (including the back), then given two topcoats of paint. Alternatively, use H3.2 if installed unpainted or stained
- nail with single fixing in the centre of the batten