Fibre-cement cladding – delamination at sheet edge

Causes

Sheets continuously damp

Sheets absorbing moisture where not adequately primed and painted at the bottom edge 

Listed under: Exterior, concrete and cement, fibre-cement, cladding, walls, wall cladding, fibre-cement cladding

Cause

Sheets continuously damp

Repair

  • remove cause of the continued damp, such as by clearing back soil or foliage that is against the cladding. Aim for a minimum 30–50 mm gap between the base of the cladding and the ground to prevent moisture uptake and allow the bottom of the cladding to dry completely. Ensure that lowering the finished garden level does not lead to rainwater flowing under the house

  • replace damaged sheets, again allowing a gap between the base of the cladding and the ground. Be careful to prime and paint along the bottom edge and 150 mm up the back face of the sheets

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Cause

Sheets absorbing moisture where not adequately primed and painted at the bottom edge 

Repair

  • ensure a minimum 30–50 mm gap between the base of the cladding and the ground to prevent moisture uptake and allow the bottom of the cladding to dry completely – clear away any soil or vegetation that is against the sheets

  • replace damaged sheets, again allowing a gap between the base of the cladding and the ground. Be careful to prime and paint along the bottom edge and 150 mm up the back face of the sheets

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