• Our Biocide Treatment is a deeply penetrating solution, formulated specifically to target the problem of damaging moss and mould growth on a variety of external mineral surfaces, including but not limited to  manufactured roof tiles, slates, profile sheeting, driveways, patios, paths and rendered walls .   
  It can be applied as a stand-alone treatment or as a post-treatment after pressure washing, or ahead of surface repair & coating.
  
  Biocide treatment simultaneously targets and kills moss, plus a whole range of other organisms that grow on roofs and other hard surfaces, including: green mold, black mold, lichens, algae and moss. It is generally used alongside other cleaning methods, including pressure washing and mechanical removal (scraping/scrubbing).
  
  Applications include;
• Neutralizing and removal of heavy moss from hard surfaces
• Cleaning & restoring clay roof tiles
• Surface sanitizing after pressure washing
• Asbestos cement (AC) roof maintenance  
• Restores the color of organically stained materials
• Improves adhesion quality of water-proof coatings
• Prevents moss re-growth under new coatings
• Sanitization and disinfecting of hard surfaces 

How does it work?

Moss is a particularly insidious 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.   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!   

Once established it can spread remarkably quickly, especially with the second essential ingredient; moisture.  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.   

The root system of the moss gradually loosens the surface and the organism retains moisture up to 16 times its dry weight.  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 release of these corrosive chlorides contributes further to the porosity of the roof material and weakens it.  

Freeze/thaw erosion exacerbates deterioration of the roof surface.  In winter the moisture laden moss freezes along with the moisture it has trapped.  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.