The effect of roof cleaning may last up to 12 months, could be more or less, but often lasting between 3-5 years for most properties. It depends on the type and condition of your roofing materials. If you are not far from trees, have northerly roofing slopes or your location keeps wet for extended periods, moss and algae may come back faster.
What is the longevity of roof cleaning?
A simple clean of only the moss at the surface might seem effective, but new growth can establish in less than 12 months. A more comprehensive service (moss removal followed by a biocide/softwash treatment) usually lasts longer as it tackles the invisible spores. For Roof Cleaning Gloucester, contact www.stagsoftwash.com/residential/roof-cleaning-gloucester
As a rough guide:
Manual removal only: usually 6–18 months.
Abatement and biocide application: 2–4 years commonly
Continual operating approach: could detour progress of the moss long term
Maintenance tips that actually help:
Here are a number of everyday things you can do to help keep the roof clean:
Less shade, less moisture, and less debris allowed to pile up in guttering!
Clear gutters (every season at the minimum) as clogged gutter shoots water over the roof edges, causing them to stay damp and sprout gross stuff.
Clean up after autumn and storms
Prune overhanging tree branches to allow sunlight and airflow
Look for missing, slipped or cracked tiles so rainwater does not penetrate the roof structure.
Enquire into a re-treatment regime: Even a simple application of light biocide on top every 12–24 months can make all the difference.
Finally, a word of warning – try not to blast tiled roofs with pressure washers unless you have had it professionally assessed as safe to do so. A poor method will be far more detrimental to the roof’s lifespan than moss ever could be.