The primary job of your roof is to provide shelter from the elements and insulate the home. Ideally the roofing material should be made of a water resistant material that can withstand the harsh onslaught of bad weather, high winds, sleet, frost, snow and heavy downpours. It should additionally be resistant to the direct UV rays of the sun beating down on it. In order that the roofing remains functional and lasts for a considerable span of time, occasional roof cleaning can help in removing debris, dead leaves, bird droppings, mould, moss and algae that can accumulate causing damage and deterioration. 

The overhanging branches of trees growing close to a home can cause damage to the roof in a number of ways. The branches scratch the surface of the roofing and can dislodge tiles or slate. Fallen leaves accumulate on the surface and can collect and jam the gutters. The rainwater is unable to drain safely and can end up damaging the roofing. Trees should be trimmed to prevent excessive accumulation of leaves on the roof.

Excessive build up of moss, fungi and algae on the roof surface can appear unsightly as black streaks that can make your home look unattractive. Tar that is used as a common waterproofing provides an excellent source of food for airborne spores that later grow into fungi. The moss can cause extensive damage to your home in a number of ways. Moss is a natural living organism that has the ability to retain moisture. The absorbed water in the moss growth can cause additional weight and stress to the surface that might eventually buckle and warp under the weight. In winter the moss freezes over and the absorbed water expands as it freezes causing tiles and slate to be displaced. Tiles can also break or crack as they are pushed together under the pressure of the freezing moss. Such movements can also cause the mortar joints to be weakened creating leaks. The most serious outcome of moss formation is the water damage that is caused.

Roof cleaning contractors can suggest high pressure water jets to remove debris and moss from the surface. A preferred technique called the "soft wash system" is also employed. Fibreglass materials require more frequent cleaning. To avoid expensive repairs and total replacement in the future, timely cleaning can save money. Hiring a professional contractor that uses modern techniques and chemicals will ensure more thorough and systematic removal of moss, lichens and mould during roof cleaning. Property owners can find approved, licensed contractors offering professional services in the area.