In all of the above scenarios, correct application of Bio-Wash Roof Cleaner improves adhesion and longevity of the protective treatment or repair, by effectively sanitising the surface. Kingfisher Extreme Climate (re-sealing roof tiles invisibly).Kingfisher Pointing Solution (Re-pointing of ridge tiles and verges).Kingfisher Kolourseal (Preventing re-growth underneath coating).However, it is more commonly used as a roof cleaning pre-treatment for: Used as an annual maintenance treatment, it prevents moss from building up to concentrations that can damage a roof. Bio-Wash Roof Cleaner is that surface sanitiser, killing the invisible roots and spores embedded in the porous surface of your roof, suppressing the re-growth. You can wipe spilt food with a damp cloth, but if you want to sanitise the surface safely, you also need anti-bacterial spray. It is therefore helpful to think of the roof cleaning process, more in terms of kitchen hygiene. The process may be likened to cultivating a field for a new crop! This is why people observe “I cleaned my roof but the moss grew back twice as fast”. This apparent paradox arises because:Ī) Removal of organic growth reveals a degraded, more absorbent surfaceī) Simple removal leaves behind spores and roots, invisible to the naked eye This has the effect of micro-rupturing the surface of the roof, as the freezing water expands to form ice, which in turn permits deeper water penetration, worsening frost cracks and eventually rendering some roofs completely porous.įrustratingly, cleaning the moss by pressure washing or scraping alone can actually make matters worse. In winter the moisture laden moss freezes along with the moisture it has trapped. The release of these corrosive chlorides contributes further to the porosity of the roof material and weakens it.įreeze/thaw erosion exacerbates deterioration of the roof surface. Additionally, this semi-permanent moisture encourages the emergence of corrosive salts (which might otherwise have remained locked away for years) from concrete tiles, clay tiles, mortar joints and even asbestos cement sheets. The root system of the moss gradually loosens the surface and the organism retains moisture up to 16 times its dry weight. Moss loves our rainy climate and will thrive in damp, shaded conditions which is why, if you look carefully, you will notice that the north elevation of most roofs exhibit more organic growth than south facing surfaces. Once established it can spread remarkably quickly, especially with the second essential ingredient moisture. A few clumps of moss appearing on a roof might seem innocuous enough, but this little plant has an appetite and your roof is now its food source! Moss is a particularly insidious roof invader because it very much plays “the long game” and the damage it inflicts can go un-noticed until quite far into the deterioration cycle.
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