Polycarbonate Roof Moss Removal — Gordon Street, Elsternwick

Moss on a pergola is a light problem before it is anything else. The whole point of a clear roof is what comes through it, and a moss layer turns that into a dim green cast. The damage comes second: moss holds water against the sheet and around the fixings, on a structure meant to shed water immediately.

Nothing abrasive went near the sheeting. Polycarbonate scratches far more easily than glass, the marks are permanent and they go cloudy, and the UV layer on the outer face strips off under harsh chemicals or a wire brush. Lose that layer and the sheet yellows and turns brittle within a few summers. The moss was treated so it released, then washed off at low pressure.

• Moss treated so it released from the surface
• Sheeting washed down at low pressure only
• No scraping, brushing or abrasives on the polycarbonate
• Fixings and joins cleared by hand
• Surrounding area rinsed on completion
• Before and after photographs supplied

• Light transmission back to clear through the sheeting
• No scratching or clouding on the polycarbonate
• UV coating left intact
• Water sitting around the fixings cleared away