Moss, Algae and Litchen on roofs

Moss growth on roofs has grown hugely in the last few years along the South Coast of the UK. This comes as an unintended by-product of the 1993 Clean Air Act which ‘gives powers to local councils to control domestic and industrial smoke to improve local air quality and meet EU air quality standards for sulphur dioxide’ and ‘Authorises the government to control the content of motor fuels and oil fuel for furnaces.’

So what this means is the lead-free petrol, coal, gas, oil etc we now burn in commercial and domestic premises, our cars etc, emits far less sulphur dioxide. Sulphur dioxide is a poison to algae, moss and lichen and thus, in its absence, moss is thriving like never before.

In the past, this sulphur dioxide would have kept the levels of moss down but now homeowners need to take action themselves to rid their houses of moss. Not only does it not look good, but can cause problems with your roof.

We offer 2 different services for Moss Removal on your roof:

      • Brushing and scraping off moss. This removes the majority of the moss and lichen off the roof and dramatically improves the look. It does not kill the spores and moss will grow back after a time.
      • Spraying the roof. We spray with a Biocide which kills the moss and the spores. We use a natural Biodegradable moss killer which has a rapid breakdown rate after use, leaving residues absorbed by bacteria and it does not affect any known material used in construction of houses.

It starts to act immediately and usually begins to produces results within 24 hours but some organisms with will take a little more time. Moss usually begins to die within 24 hours and usually start falling down within a few days depending on the exposure to wind and rain.

Lichen are well-encrusted and take longer to fall away. The Biocide kills lichen and once dead, they become soggy with rain, and curl when dry and after a little time (depending on the weather) they too fall off.

If you roof is heavily infested with moss then 1 and 2 should be done.
If the roof has a light quantity of moss but is covered with algae and litchen, then usually just 2. above will suffice.

moss beforemoss after