So in my area in Australia we have a whole heap of tiled roofs. The majority of them have lichen on them. The dilemma that I have is the whole softwashing/pressure washing debate when it comes to roof cleaning. I’m already aware of most of the pros and cons of both methods. I’ll just list a few so that I can demonstrate the extent of my knowledge in the area (by no means expert). Please bear in mind that I’m talking about removing lichen from tiled roofs. In my area its either tiled or colourbond roofs. The tile roofs tend to be the dirtiest as they are on most of the older homes.
Softwashing Tile Roofs
Pros- Low pressure treatment, can apply from the ground, not risking breaking tiles or water ingress, cleaning solution attacks the route cause (organic growth) and kills it
Cons- Due to the stubbornness of lichen it won’t simply fall away as soon as the SH does it’s work. If you apply an SH mix it will die but will then take another 8-12 months for it to fall off with the action of the wind/rain
Pressure Washing Tile Roofs
Pros- Instantaneous results due to using the force of water to remove the lichen
Cons- Risk of cracking tiles, water ingress, falling from roof
I guess my query comes from the fact that most homeowners are looking for quick results. Most homeowners are wanting to walk outside and look at a clean roof, not have to wait for 1 year for it to look better. However I know the pressure washing carries some inherent risks when it comes to cleaning tiled roofs so hence why I’m looking for your guys opinions.
For reference I have a pretty decent setup on the back of a ute. 5.5gpm 3k psi hot/cold pressure washer and a 12v softwash system with a proportioner. I also have a telescoping pressure pole (yes, I’ve heard plenty of people laugh at them and dismiss them, but I view it as another tool that can come in handy from time to time)
Some operators pressure clean tiled roofs day in and day out and then there are others who hardly do them or if they do then it’s softwash only and explaining to the client that it takes a year before you’ll begin to see any results.
What are your thoughts, how do you go about cleaning tiled roofs with lichen on them???