A homeowner in Crosby got in touch about a leak that had started showing as a damp patch near a chimney breast. Nothing dramatic — no missing tiles, no obvious storm damage — but persistent enough that it needed sorting before winter. Here’s what we found and what we did about it.
What We Found
Once up on the roof, the cause was clear: a heavy build-up of moss across a large section of the slope, thickest right around the chimney flashing. Moss like this holds moisture against the tile and flashing junction for long periods rather than letting it run off — and that's exactly where this leak was tracking in.
Why We Removed It by Hand
Pressure washing would have cleared the moss faster, but on a roof this age it also risks cracking tiles or dislodging the ridge mortar — trading one problem for another. We scraped it away by hand instead, tile by tile, particularly carefully around the chimney flashing where the leak was originating. Slower, but it meant nothing underneath got damaged in the process.
Treating It Afterwards
Once the roof was clear, we treated it with a professional biocide. Removing moss without treating afterwards just buys you a year or two before it's back to where you started — the treatment kills off remaining spores and slows regrowth for considerably longer.
Worth knowing: not every mossy roof has a leak, and not every leak is caused by moss. If you're not sure which applies to you, our free roof inspection will give you a straight answer before you spend anything.
Got a Similar Problem?
If you've spotted damp patches, or just think your roof might be due a clean, call, WhatsApp, or send us a photo and we'll take it from there.
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