If you had the gutters cleared in spring and they are full again by autumn, the debris is not blowing in. It is coming off your own roof, a few feet above the gutter.
Why moss ends up in the gutter
Moss takes hold on the shaded, damp side of a roof, usually north facing or under trees, and older concrete tiles give it more to grip than smooth modern ones. It grows, it dies back, and every heavy shower carries clumps of it down the slope into the gutter. The gutter is simply the bottom of the hill.
Clearing alone becomes a standing order
You can keep clearing it, and for a lightly mossed roof that is a perfectly sensible choice. It just means booking it every year, sometimes twice, for as long as the roof keeps shedding.
What treating the roof does instead
Roof cleaning is a low-pressure soft wash. A biocide treatment is left to dwell on the tiles and kills the moss at the root rather than blasting it off, because high pressure on a tiled roof strips the surface and drives water where it should not go. The dead growth then weathers off over the following weeks and months instead of arriving in the gutter in one lump.
The gutters are part of it
Our roof cleaning includes the gutter clearance, with the full scope confirmed in your quote. That matters, because whatever comes off the roof during and after the treatment has to go somewhere, and that somewhere is the run you have just paid to clear.
Which one do you need?
- Tiles look clean and it is leaves in the gutter: clear the gutters, and think about the trees.
- Green cushions visible on the tiles from the ground, and gutters blocking within a year: treat the roof.
- Not sure: send photos of the roof taken from the garden and from the front, and James will say which it is.
Timing
Soft washing needs suitable weather, so the appointment depends on the forecast as well as the diary. It is not an all-weather job, and anybody promising otherwise is planning to rush the dwell time.
Ready to sort yours?
Look at roof cleaning and moss removal