Roof treatment that keeps working
A biocide treatment kills moss, lichen and algae on your roof and keeps killing new growth for months. It finishes every clean, and on a roof with light growth it can be all you need.
- Low pressure, no blasting
- Biocide treatment
- Free, no-obligation quote
Get a free roof quote
Tell us about your roof. We’ll call or text back with a price.
What a biocide does
A biocide is applied to the roof at low pressure on a dry day. It soaks into the growth and the surface of the tiles and kills algae, lichen and moss spores. Dead growth loosens and rain washes it away over the following weeks and months.
- After a clean: stops growth coming straight back.
- On its own: for roofs with light growth, a treatment can do the whole job slowly and gently.
- As upkeep: a treatment every so often can save you ever needing another full clean.
Drag to compare. Concrete tiles, before and after.
Straight answers on roof coatings
Roof coatings are often sold hard, straight after a clean. Here’s our honest view.
- A sound roof doesn’t need a coating to protect it. Tiles are made to stand up to the weather on their own.
- Coatings are mainly about colour. They can refresh old concrete tiles that have faded. That’s a looks choice, not a repair.
- A coating won’t fix a failing roof. Broken tiles, bad mortar or a leaking roof need a roofer.
- Be wary of pressure. If someone says your roof will fail without one, get a second opinion.
We quote for cleaning and treatment. Ask us anything about coatings and we’ll give you a straight answer for your roof.
Roof treatment: questions answered
Can a treatment be done without anyone going on the roof?
Often, much of it can be applied from safe access at the edge of the roof, which keeps foot traffic on the tiles to a minimum. How we reach your roof depends on its height and shape.
We explain the access when we quote, so you know exactly what will happen on the day.
When is a treatment on its own enough?
When the roof has light growth: algae streaks, a little lichen, early moss on the shaded slope. A treatment kills it, and the rain washes it away over the following weeks and months.
It’s the gentlest way to clean a roof, because nothing is removed by force. For roofs with thick moss, a full clean with hand clearing comes first, then the treatment.
How soon will I see the treatment working?
Algae often lightens within days, moss browns off within a few weeks, and lichen goes pale and starts to flake. The full result takes a few months of normal Essex rain.
We explain this in more detail in our post on how long a roof biocide treatment takes to work.
Do you treat roofs regularly?
Yes. A treatment on its own every so often, when the first signs of growth come back, keeps a roof clean without another full clean.
Roofs under trees, near woodland such as Epping Forest or Hockley Woods, or by the coast usually need it more often than open ones.
Is the treatment safe around my garden?
It’s applied to the roof at low pressure and kept there as far as possible. We take care around plants, ponds and pets, and ask you to keep pets in while we work.
Tell us about anything sensitive below the roof when you ask for a quote, such as a fish pond or vegetable bed, and we’ll plan around it.
Does a treatment change the colour of the tiles?
No. It removes the growth, so the tiles’ own colour shows again. It doesn’t dye or coat them.
On old concrete tiles that real colour may be paler than you remember, because weathering has faded them over the years. That’s the tile, not the treatment.
Four steps, one visit
Free quote
Send your postcode and a photo, or call. We price the roof and tell you honestly if it doesn’t need doing yet.
Hand clear
Thick moss is lifted off by hand first, so we never need high pressure to shift it.
Soft wash
A cleaning solution at low pressure kills and lifts algae, lichen and moss roots without blasting the tile surface.
Biocide and tidy
A biocide finish keeps working for months. Debris is cleared from the gutters and the ground before we go.
Questions people ask
How long does a biocide treatment last?
It keeps killing new growth for months. How long depends on shade, trees and tile type; shaded roofs under trees need it more often.
Why is the moss still there after a treatment on its own?
A treatment works slowly. The growth dies first, then loosens and washes away with the rain over the following weeks and months.
Do I need a roof coating?
Usually not. A sound roof doesn’t need one. Coatings are mostly about colour on old concrete tiles.
Can you treat the roof in winter?
Yes, on dry days. The treatment needs a dry spell to soak in, so we plan around the forecast.
Find out what your roof needs
Send us your postcode and a photo if you have one. Free quote, honest advice, no pushy upsell.