Devon’s wet climate makes Exeter one of the highest-risk areas for moss and lichen colonisation in England. Moss holds moisture against tiles, lifts edges, and accelerates damage across the entire roof surface. We remove moss correctly — no pressure washing, biocide treatment included — and extend the life of your roof covering significantly.
Roof moss removal in Exeter uses low-pressure biocide treatment, never pressure washing, from 200 to 500 pounds including a written condition survey. Correct treatment preserves the tile surface and slows regrowth. NFRC-registered, free quote. Call 01392 759 295.
Exeter’s position in the Exe Valley, combined with Devon’s prevailing Atlantic weather, creates a microclimate that encourages moss growth on almost every north-facing roof surface within 3–5 years. North-facing slopes in Heavitree, Whipton and the Pennsylvania Road area are particularly affected. Properties under tree canopy — common across Exeter’s leafy suburbs — can develop significant moss coverage within 18 months of a clean roof.
We start with mechanical clearance using soft brushes and rakes — no pressure washing, which damages tile surfaces and dislodges mortar. Following clearance, we apply a professional-grade biocide treatment that kills remaining spores and significantly retards re-colonisation. We then inspect the cleared roof surface for any tiles, mortar or flashing damage revealed by the clearance.
Moss clearance generates significant debris volume. We clear all valleys, gutters and downpipes as part of every moss removal job. Moss-blocked valleys are one of the primary causes of leak calls we receive in Exeter every autumn — removing this risk at the same time as the surface clearance is essential.
For properties in high-risk areas — north-facing slopes, properties under tree canopy, Exeter’s wetter valley locations — we offer annual or biennial maintenance visits combining gutter clear and biocide re-treatment. Customers on maintenance programmes see significantly lower long-term repair costs.
Clearance, biocide treatment, valley and gutter clear
Larger roof area, all elevations
Additional time for thick moss / lichen
Annual biocide re-treatment and inspection
“North-facing roof was completely green. They cleared it properly without pressure washing, treated with biocide, and cleared the gutters. Roof looks years younger.”
“Had moss causing tiles to lift at the edges on our Whipton house. Proper clearance and biocide. They also found a cracked ridge tile during the clean and fixed it at the same time.”
“Annual maintenance visit booked after their first clean. Hassle-free, always turn up when they say. Keeps the roof in order without us having to think about it.”
Moss removal and biocide treatment for a standard 3-bed semi in Exeter costs £200–£500 depending on severity and roof area. Heavily colonised roofs with thick moss growth take longer and may require multiple passes. We provide a free, site-specific quote.
Devon’s climate — warm, wet, and relatively mild winters — creates ideal conditions for moss and lichen. Moss holds moisture against tiles, accelerating freeze-thaw damage to mortar and tile surfaces. Heavy moss also lifts tile edges, creating pathways for wind-driven rain. On concrete interlocking tiles, moss infiltration under tile laps is a primary cause of leak calls.
Yes — always. Mechanical removal alone will be re-colonised within 12–18 months. We treat with a professional biocide following removal, which breaks down remaining spores and significantly slows re-growth. Many customers arrange annual or biennial maintenance visits.
When done correctly — soft wash methods, appropriate biocide concentrations, no high-pressure washing on tiles — moss removal does not damage tiles. High-pressure washing, by contrast, strips surface coatings from concrete tiles and can dislodge mortar. We do not use pressure washers on tiled roofs.
Exeter's relatively high rainfall and mild winters create ideal conditions for moss growth, particularly on north-facing slopes that dry out slowly. Shade from trees — common across Heavitree, Pinhoe and St Thomas — accelerates establishment. Once moss holds moisture against the tile surface, it accelerates freeze-thaw damage.
No — high-pressure washing strips the weathered surface of clay and concrete tiles, accelerates surface erosion, and forces water under the tiles. We use low-pressure biocide application followed by mechanical brushing where required. The biocide continues working for months after treatment.
Most Exeter properties benefit from treatment every 3–5 years depending on aspect, tree cover and tile type. North-facing roofs with tree overhang may need treatment more frequently. We include a post-treatment condition report with every job. Call 01392 759 295.
We’ll assess your roof and give you a clear quote including biocide treatment.
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