Moss and algae clinging to roof tiles are unsightly but also if left for too long can cause damage. The roof tiles can begin to decay as the lichen and moss take hold and their roots find their way into the porous top layer of the clay. The moss holds moisture on the roof, feeding from it so it’s a dwindling spiral that isn’t going to improve without intervention. The longer you leave it the worse it gets. It’s quite a straightforward and painless procedure to get rid of it though. Here you can see the difference roof cleaning can make to the overall appearance of your roof.
BEFORE IN PROGRESS
When done professionally the transformation of the roof tiles can be remarkable. Don’t take our word for it, a picture paints a thousand words and from these pics we took you see what roof cleaning actually does. Prices range from £800 for a simple “up and over” terraced or semi, up to £3,500 for a big detached house. The roofs in these pictures both cost just under £1,000 to get back to as new condition. After the cleaning was finished the tiles were sealed to protect them, leaving them looking almost as good as the day they were installed.
Q: HOW LONG DOES IT TAKE?
A: On a good day between April and September, about one day. These are the best months to have your roof cleaned. The days are longer and the roof tiles dry quickly enough so they can be sealed on the same day.
Q: HOW IS IT DONE?
A: By pressure washing it, starting from the top and working downwards so no water gets up under the tiles and into the loft. This is the most effective way of cleaning the roof.
Q: WHY HAVE IT SEALED AFTERWARDS?
A: The sealer impregnates the outer layer of the clay tiles. This inhibits the possibility of roof lichen and moss taking hold and protects the tiles from the effects of “spalling” (moisture getting into the microporous holes in the clay, freezing in winter and cracking the outer layers of the tile) It won’t 100% prevent moss from taking hold again but it will retard it by many years. Most good quality sealers come with a 10 year guarantee. That means it’s guaranteed to protect the roof tiles for that long, not prevent the moss growing again.