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Roof Cleaning / Sealing

Low pressure roof washing

Roof cleaning is the process of removing algae, mould, mildew, lichen and moss from roofs. Also cleaning oxidation on metal roofs. Cleaning can extend the duration of a roofs ability to function. Algae and other types of build-up often form on the north and west parts of roofs that are shaded or receive less sun, and can reduce a roof's life expectancy. The presence of soot, dirt, or biomass can affect how much sunlight is absorbed by a roof and thus the amount of heat a building absorbs.

Cleaning apparatus

One safe and effective means to clean a roof is an electric agricultural sprayer system, as originally developed in the early 1990s. The equipment is used to apply a cleaning solution (typically containing bleach) that kills the algae, baceteria, mould, mildew, moss, fungus and other organic organisms growing on the roof. This is soft washing. The equipment does not use pressure or mechanical means to clean the roof. Using a pressure washer, or any other petrol/diesel powered device, to clean a roof at more than 100 PSI can damage the roof.

Safe, effective soft washing cannot be achieved with a pressure washer, as the downstreaming cannot achieve sufficient strength solution to kill the organisms, cleaning the roof.


There are various forms of sealants and paints available but the first port of call after a full clean is to look for areas of repair and replacement. Once all areas have been looked at and both client and contractor are satisfied the roof is in good structural condition a choice of sealants and paints are available. The basic sealant will not change the apperance of the roof maybe give a slight sheen, but will reduce heat loss and the speed at which moss, mould, lichen etc build up. The next step would be to paint the roof which would give a completely new apperance with a choice of colours and extend the life of the roof by many years.

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18 January 2021
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