Terracotta Tiles and Slate Tiles
Terracotta tiles and slate tiles one of the most common roofs cleans we use K4 for roof cleaning for in our regular clean. They are a remarkably good tile when they are first made and often pressure cleaning has been used to clean them often with good results.
Unfortunately, older roofs have a mortar mix of sand and cement on the ridge caps and high pressure tends to blow the loose bits away leaving the ridge caps loose and easily shifted in a storm.
A safer and more effective method and less expensive is to use K4 on terracotta tiles. This is highly effective because it’s saturating all those small areas where high-pressure cannot get to it. A simple application with K4 for roof clean will kill and remove all noxious growth on the roof, including all the nooks and crannies that you see on a tile. When contractors walk over an older roof particularly a terracotta tile roof the tiles can offer become fretted. This means the tiles are weakened with age and the integrity of the tile when walked on can often unknowingly break or crack it. The result of this of course is a leaking roof long after the contractor has gone. By using K4 for roof cleaning you avoid all these issues the roof stays cleaner longer and the cost is lower.
Slate Tiles
Slate tiles are less common than terracotta tiles primarily because the cost of them. A slate tile is normally on steep roofs like churches or public buildings and sometimes residential homes, . Wherever they are, walking on them will often cause them to break easily and high pressure will also damage them if not displace them resulting in a leak. The most viable solution is to use a soft wash method using k4 roof cleaner. It avoids climbing onto the roof or tiled area and the treatment is more thorough as well. The only downside of course is the time it takes for the roof to clean off, but the clean will be much more thorough than what a high pressure would be anyway.