High Pressure Cleaning
Moss Roof Treatment highly recommends not pressuring cleaning roofs to remove moss, mold & lichen as it can be a bit more complicated than it sounds.
High Pressure Cleaning is conducted at 4000psi which is very strong, and this can cause damage to the roof surface. It is best to avoid this process unless you are painting the roof afterwards (generally on cement tiled roofs and Colorbond).
While pressure cleaning gives the instant clean look, moss spores can still remain on the surface and start to regrow within a matter of months.
Below are the issues that can occur when high pressure cleaning roofs . . .
Cement & Terracotta Tiled Roofs
Tiled Roofs when pressure cleaned can have the following issues occur:
Broken/Disturbed Tiles
Pointing being disturbed and blown apart
Water entering the roof
Stains on Ceiling
Ripped Sarking causes water to pool in one area causing ceiling stains
Very Messy job, clean up required
Costly repairs
Bigger Unnecessary Job
Removes paint and colour from tiles
Water In Roof
Ripped Sarking
Broken Tiles
Messy Jobs
Wrecked Pointing
Damaged Tiles
Iron / Colorbond Roofs
Iron / Colorbond roofs when pressure cleaned can have the following issues occur:
Colour fades from iron sheets
Removes Protection powder coatings of roof sheets
Doesn’t get rid of black stain
Pre-Ages Roof Surface, allowing moss growth to regrow faster
Most regrowth can come back worst due to porous sheets
Removes Colour
Removes Powder Coatings
Broken Tiles
Other Surfaces & Issues
Other roof surfaces when pressure cleaned can have the following issues occur:
Holes in Laserlite when pressure cleaned
Wastes Water
Slate tiles are brittle & cannot be pressure cleaned
Pressure cleaning is dangerous
Roofs are slippery
Steep roofs are difficult to pressure clean & it is not recommended due to tile pitch
Water gets into very steep and low-pitched tiled roofs easily
Holes in Laserlite
Wastes Water
