As every property is different in size and the density of moss cover, it is difficult to give an accurate estimate without seeing the property. However, this can be done two ways.
Firstly we can look at the property on Google maps and then give a reasonable estimate of the cost. The most accurate method is of course a sight survey by where we can survey the building, the size of roof and the moss density.
Moss is best removed during spring/summer and autumn. The reasons for this though plainly obvious are:
- When moss is dry it does not adhere so firmly to the tile or slate
- Once removed it does not leave as much staining as it would if it were wet as in the winter months
- It is much safer to remove the moss when the roof is dry mainly for access purposes
- Trying to remove the moss during winter months when frozen is not practical. When moss is frozen, it sticks very vigorously to the tile making very difficult to remove and can leave unwanted scuff marks on the tiles.
Biocide is a chemical agent, such as a pesticide that is capable of destroying living organisms. Safe to use, is not harmful to domestic pets, wildlife or plants. Under strict guidance the biocide we use can only be obtained and administered by professionals, it has undergone strict and rigorous tests with the Health and Safety Executive HSE No.8430
Leaving the moss on a roof will:
- Have serious consequences to the lifespan of a roof
- Affect the sale price of a property
- Show up on a building survey
- Allow it to spread across the entire roof
- Encourage rainwater to hold on a roof
- Make tiles brittle when moss is frozen
- Allow water too ingress to the underside of the tiles
- Build up and collect in gutters, valleys and downpipes
- Look unsightly and unkept
- Cost hundreds or thousands of £s in future repair bills
- Add extra weight to the roof when moss is soaked
Removing the moss will:
- Improve the visual appearance of your property
- Be more attractive to any potential buyer
- Save thousands of £s in repair or renewal fees
- Stop gutters, valleys and downpipes from becoming blocked
- Stop moss from falling onto drives, patios, conservatories and gardens etc
- Maintain a properties value and not undervalue it
Whilst we would not wish to cause undue concern, there are many reasons why it would be better to have the moss removed than to leave it on a roof. Moss is a plant therefore naturally it will grow and establish itself firmly in an environment that plays host to damp and moist conditions.
When moss is frozen it is at its most destructive, as the clumps freeze they put the tiles under tremendous amounts of stress making them very brittle and vulnerable to breakage.
Moss also inhibits the freefall of rainwater from a roof, as moss clumps hold water like a sponge. Roofs are built with a pitch which is intended to remove rainwater quickly from a roof but if moss is present the water can only hold which is not good for the mortar.
The presence of moss may not actually be as damaging to a roof as some of the cleaning techniques used to remove the moss. See roof coatings and power washing.
Have you ever driven on a motorway and suddenly been enveloped in a cloud of fog and then suddenly itbs clear again? Well the same principle applies with roof moss. As with fog, damp and moist conditions tend to hold in clouds, around wooded areas, rivers, lakes and low lying ground. Moss is also predominately found on north facing buildings.