Moss, mould and lichen don’t just make your roof look tired — left untreated, they trap moisture against the roofing surface, work their way under tiles and laps, and gradually shorten the life of your roof. What starts as a small patch of green in a shaded corner can, over time, turn into a full roof problem that’s far more expensive to fix than it would have been to prevent.
The Moss Crew’s proven treatment programme clears existing growth and protects against regrowth, using a method that’s safe for your roof, your garden and your family. It’s trusted by homeowners across Hawke’s Bay who want results that actually last — not a quick surface clean that leaves the roof exposed to the same problem within a year.
Moss, mould and lichen are usually the first organisms to take hold on a roof — and once established, they trigger a chain reaction that’s easy to underestimate.
Retains moisture against the roof and sends roots under tiles, shingles and laps as it spreads.
Feeds on the roofing material & dulls its reflectivity, while holding moisture against the surface.
Bonds tightly to the roof surface, making it the hardest of the three to remove safely.
Left untreated, this is the chain reaction that follows: lifted tiles, blocked gutters, cracked surfaces, and costly repairs. Catching it early — before it spreads across the whole roof — is what makes the difference between a straightforward treatment and a major repair bill.
Roof treatment only works if it’s done properly, which is why we use a two-stage programme rather than a one-off surface clean.
We apply a safe, low-pressure treatment that penetrates and kills moss, mould and lichen at the root — not just what’s visible on the surface. This is the difference between our method and a standard wash: we’re treating the cause, not just hiding the symptoms. Over the following weeks and months, the dead growth naturally breaks down and washes away with rain.
Once the roof is clear, we apply a protective treatment — the same one used on brand-new roofs — that stops moss and lichen from re-establishing. This step is what makes Stage 1’s results actually last. Skip it, and regrowth simply returns, often within a season or two.
our low-pressure method won’t strip paint, force water behind cladding, or damage timber, render or brick the way amateur pressure washing can.
a proper low-pressure wash lifts grime and organic growth at the root, so your home stays cleaner for longer, not just for a week.
a method that’s common with DIY equipment but can damage weatherboards, coatings and cladding rather than clean them.
a fully insured team with experience across every common exterior surface, from timber to brick, render and cladding.
Yes. It's a safe, low-pressure treatment. We simply ask that pets are kept indoors during application, and sensitive plants are covered or hosed down afterwards.
No — that's the whole point. Unlike high-pressure waterblasting, our low-pressure method won't strip protective coatings or force water under your roofing material.
Moss begins dying within 1–4 weeks. Most roofs look noticeably cleaner within 3–6 months, with full results achieved by 6–12 months as rain washes away the dead growth.
Stage 1 kills the majority of moss and starts the cleaning cycle, but some spores and deeply rooted growth can remain. Stage 2 locks in those results and stops regrowth — without it, moss simply returns.
Once both stages are complete, most roofs only need a maintenance check every 2–3 years. We keep a record of your service date and reach out when it's time.
We are committed to delivering exceptional roof cleaning services that protect your property and enhance its appearance.
The Moss Crew, started out treating roofs across Hawke’s Bay and has since grown to service the North Island, from Hawke’s Bay up to Auckland.
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