Moss On Your Roof: Clean It Or Leave It?

Medway's damp, shaded roofs grow moss better than most places — particularly in Walderslade, Hempstead and the tree-lined streets of Rainham and Lordswood. Homeowners ask us constantly whether it matters. The honest answer is: sometimes.

When It's Cosmetic

Light moss on a healthy modern tile roof is mostly a cosmetic issue. It hasn't compromised the waterproofing, and there's no rush. Treating it is maintenance rather than repair.

When It's Costing You Money

• It's shedding into gutters faster than you can clear them — this is the number one practical cost of moss in Medway
• It's thick enough to hold moisture against the tiles through winter
• It's lifting tile edges as it grows, creating gaps
• It's hiding damage you can't see — a slipped tile under a moss mat
• The roof is older and the moss is accelerating the decay of the surface

Why Pressure Washing Is Wrong

Pressure washing strips the surface off concrete tiles, blasts away the granular coating that protects them, and drives water up under the tiles into the roof space. It's the most common mistake we see, and it ages a roof considerably. Anyone offering to pressure wash a tiled roof is doing you damage, not a favour.

What Actually Works

A gentle manual removal of the growth, then a biocide treatment that kills the roots and slows regrowth. The moss turns brown and washes off over following months, and the roof stays clear far longer than a scrape alone. Clear the gutters afterwards to catch what sheds.

If you're not sure whether yours is a cosmetic case or something that needs attention, a free survey will tell you — often there's nothing wrong that a clean won't fix.