Exposed aggregate driveways and paths trap algae in the pebble matrix and are notoriously harder to clean than plain concrete. Professional cleaning removes it completely.
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Exposed aggregate concrete — where the top layer of concrete is washed away during installation to reveal the aggregate pebbles beneath — is a popular and attractive driveway and path finish across Queensland. It is also one of the most challenging exterior surfaces to clean effectively. The irregular surface created by the exposed pebbles provides significantly more grip for algae spores than flat concrete, traps organic matter between the pebbles, and requires specific cleaning technique to achieve an even result without damaging the aggregate bond. Burnett 2 Bay cleans exposed aggregate driveways and paths across Redlands, Brisbane, the Gold Coast and all of South East Queensland.
The pebble matrix in exposed aggregate creates a surface with significantly more crevices, texture variation and moisture retention points than flat concrete. Algae and lichen establish in the sheltered zones between pebbles and in the mortar matrix surrounding them.
Standard pressure cleaning produces an uneven result on exposed aggregate because the direct pressure point cleans the pebble tops while the crevices between pebbles retain growth. Biocidal pre-treatment that penetrates into the texture is essential for achieving a uniform result across the entire surface.
The aggregate in exposed concrete is held by the mortar matrix — and aggressive pressure washing can dislodge pebbles, particularly in older exposed aggregate where the bond has weathered. We match our pressure to the condition of the specific surface.
Sealing exposed aggregate after cleaning fills the pores in the mortar matrix and around pebbles, significantly reducing biological growth grip and making future cleaning significantly easier.
Yes — with biocidal pre-treatment and appropriate pressure technique that achieves a uniform result across the textured surface.
Aggressive pressure at close range can dislodge aggregate in older or weathered exposed concrete. We match our pressure to the specific surface condition.
Yes — sealing after cleaning significantly reduces future biological growth and makes maintenance easier.
Depends on area size. Contact us for a free quote.
Based in Redlands, serving all of South East Queensland. Reply within 2 hours Mon–Sat.
0412 291 614