Building Envelope / Facade Cleaning

Along with windows and the roof, the building façade is an important element of a location’s appearance and long term maintenance.

Oils, dirt and soot buildup tend to be cosmetic issues that are comparatively easier to resolve. However, the wet west coast climate is an ideal climate for biological growths such as algae and moss.

Left unchecked, they can become a serious issue. Biological growth can release chemicals that can bleach a surface or weaken vinyl siding, concrete and mortar, which leaves them brittle and easy to damage. Wood siding is equally affected, as molds and mosses feed off their surface and accelerate rot. Left untreated, any of these issues could become a serious problem, leading to costly repairs and major inconveniences for residents.

Technique:

There are three approaches to façade cleaning.

Hand Cleaning/Soft Wash

o These generally involve an individual cleaning the surface with mechanical action. This usually includes a water brush of some sort, with soap or some other agent used to loosen dirt and growths.
o This can be the most thorough approach to cleaning the façade but it is also the most time consuming. It is best used in cases where other techniques are unavailable or there are particularly stubborn issues on the surface.

Pressure Washing.
o Very effective and efficient: will remove almost everything from a surface.
o The high-pressure spray can damage wood, old vinyl and even certain types of brick. Thus it is critical that the façade is tested beforehand for its durability.

Cleaning Solutions
o Solutions are used often in conjunction with hand cleaning or pressure washing. They help to break down hardened grime that can’t be removed through either option alone.

Frequency.

As with other areas, the cleaning frequency may vary, but issues can start to emerge in less than two years. Residents should remain vigilant of these issues, and once contamination emerges cleaning is recommended. In general, spring and summer are the best times of year to undertake facade cleaning. The hot and dry weather weakens the growth and makes it easier to remove.