Mould Growth on Exterior of Buildings and Surfaces

Mosses, algae, mildew are living plant organisms, which only require moisture, light, and minerals to grow.  For these reasons, the rainforest coast of British Columbia is ideal climate for mould growth on everything from roofs, siding, gutters, walkways, driveways, and fences.  The mildew, algae, and moss do not grow directly on the surface but grow on the accumulation of dust and other organic materials that settle on the exterior surface. These plants become dormant when dry but will restart growth when the conditions are favorable.    There are many environmental variables such as location of the building; direction the building is facing to the sun, and the quantity of trees, creeks, rivers, and lakes in the area, all of which contribute to mildew growth.  



WorkSafeBC Regulations

An employer must ensure that a fall protection system is used when work is being done at a place from which a fall of 3 m (10 ft) or more may occur.  A worker must wear a safety belt, a full body harness or other harness acceptable to the Board when using a personal fall protection system for fall restraint.  An anchor is a key element of any personal fall protection system.  An anchor may consist of a load-rated strap or sling wrapped around a substantial structural member on a building.  An anchor may also be a manufacture component that permanently or temporarily attaches to a structure. 


JFB Pressure Washing makes it mandatory that all our employees wear full body fall protection and it is connected to an anchor that is permanently or temporarily attached to a structure.


If you hire a business or contractor, be sure to check if they are registered with WorkSafeBC to protect yourself against any liability. Or it could end up costing you more than you had planned.  Get a clearance letter from WorkSafeBC.  You can obtain one online in less than a minute on  the WorkSafeBC website: External link opens in new tab or

"Just wanted to say thank you for doing such a good job on cleaning up our building. We’ve had many compliments on the clean courtyard.  We appreciate your professionalism and good work.  Hope to see you next year or sooner."

Thanks again,

Verna, Vancouver