Garden walls accumulate algae and staining just like hard floors. Here's how they're cleaned and what to expect.
Brick and stone garden walls develop algae, moss, and lichen growth over time, particularly on north-facing or shaded aspects. This growth can make walls look dark and neglected, and in the case of more porous brick or stone, it can accelerate deterioration by holding moisture against the surface. Professional cleaning removes the growth and restores the natural colour of the masonry.
The technique for cleaning walls differs from cleaning flat surfaces. Pressure must be adjusted carefully for wall surfaces — too much pressure can dislodge mortar from joints. Soft washing is often appropriate for older walls with lime mortar or softer brickwork. We always assess the wall condition and mortar type before commencing cleaning.
After cleaning, a biocidal treatment can be applied to retard the return of biological growth. For stone walls that have been significantly darkened by algae, the difference cleaning makes can be remarkable. Some homeowners opt for a masonry water-repellent treatment after cleaning, which reduces water absorption and makes future maintenance easier.
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