Composite cladding care: cleaning façades and checking ventilation

Wash accessible areas gently #

Check the approved method and test a discreet area first. Work in small areas so detergent does not dry on the surface, and avoid streaking across adjacent finishes. Never drive water upward into laps or through open joints with a pressure jet. Obtain specialist help where safe access is not available.

Investigate streaks and sheltered dirt #

Rain washes exposed and sheltered faces differently. Deposits below sills may come from metal runoff, sealant or dirt collected above. Identify the source before spot treatment. Keep irrigation from repeatedly wetting the façade. Broad colour differences may reflect orientation and shading, not simply a cleaning failure.

Keep the wall system working #

Inspect accessible ventilation openings, insect screens, flashings and terminations without dismantling them casually. Do not fill designed joints with sealant or block the cavity with insulation or landscaping. Damaged seals and flashings need compatible repairs. Loose panels, bulging or signs of water ingress require competent inspection.

Do not change the assembly casually #

Replacement boards, fixings, coatings and added fixtures can affect the approved façade build-up. Fire and structural suitability belong to the whole specified system, not the word composite alone. Never stand on cladding or use it to support a ladder. Keep maintenance records and ask the supplier before altering details.

Product instructions come first #

Identify the manufacturer, collection, capped or uncapped surface and installation date before choosing a treatment. A method suitable for one composite can damage another. Start with loose-dirt removal, then a small test using the permitted cleaner and a soft non-metal brush. Rinse thoroughly and assess when completely dry. Follow the product's dilution, contact time and care instructions; never mix cleaning chemicals. Restrict access while the surface is wet or unsafe.

[2]

Green Plank product support #

For Green Plank decking, fencing or cladding, request the current care instructions for your exact profile and finish. The Green Plank links below are commercial documentation resources. These guides provide general care advice, not a product certification or a decision on any individual warranty claim.

[1]

Practical inspection checklist

Common questions