What roof moss is actually doing to your property

A mossy roof looks characterful from the pavement. Up close it is a slow, expensive problem.

Moss holds moisture directly against the tile surface. Through winter that water freezes, expands and accelerates the breakdown of the tile face — particularly on older concrete tiles that have already lost their surface finish.

As the moss thickens, clumps break away and wash into the gutter line. We regularly clear gutters that are entirely packed with moss, which means water is overflowing down the fascia and, eventually, into the wall.

The correct process is manual first, chemical second. Moss is scraped and brushed off by hand from a safe working position. Pressure washing a roof is a false economy: it strips the tile surface, drives water under the laps, and guarantees faster regrowth.

Once the bulk is off, a biocide soft wash treats what remains at the root. The roof continues to lighten for several weeks as the dead growth weathers away.

Finally, the gutters and downpipes are cleared of everything that came down during the work, and the whole thing is photographed from height so you can see what you paid for.