Waterproofing Remediation in Randwick: Planter Box Water Ingress Affecting Adjoining Units on Barker Street

Planter box waterproofing failures are one of the more common calls we get from strata buildings in Randwick. The problem starts in the planter, but it doesn't stay there. At this Barker Street property, deteriorated waterproofing under the planter boxes had been letting water track into the structure and affect adjoining units. By the time the Owners Corporation called us in, the moisture damage was already spreading.

Waterproofing Remediation

The scope was straightforward but had to be done properly. Plants, overburden soil, and electrical cabling were all removed to expose the failed waterproofing system underneath. The existing membrane was stripped out, substrates were prepared, and a new waterproofing membrane was installed across the full planter box area. Brick planter box restoration was carried out alongside, leaving the structure ready for future landscaping. One day on site, team of two. The water ingress to the adjoining units stopped.

Why Planter Box Waterproofing Fails in Strata Buildings

Planter boxes on strata buildings sit over structure, usually a slab, a deck, or a podium. The waterproofing membrane underneath carries constant moisture load from soil and irrigation. It has a lifespan, and most strata buildings don't track when it was last replaced. By the time water is appearing in a unit below, the membrane has usually been failing for a while. Randwick's older residential buildings along Barker Street and the surrounding streets have a lot of planter boxes that are well past that point.

What Happens When Planter Box Water Ingress Gets Left Alone

Water tracking from a planter box into adjoining units doesn't stop on its own. It gets into the substrate, into the wall cavities, and eventually shows up as internal water damage, mould, and strata disputes between neighbours. The remediation here was a one-day job. Waiting another twelve months would have added a significantly larger internal repair scope on top of it.

Seeing Water Ingress from a Planter Box at Your Sydney Strata Building?

If neighbouring units are showing moisture damage and there are planter boxes on the slab above them, that's where to look first. Get a waterproofing inspection done before it goes to a strata dispute.

Contact Quin Projects to talk through your building.