When planter boxes are located above basements, apartments, or carparks, failed waterproofing can lead to serious structural damage. In this case study, we were called out to address persistent leaking ceiling issues caused by deteriorated planter box repair membrane systems above.
This project highlights what can happen when planter box waterproofing is left to age or patched over—and why a full membrane system revamp is often the best solution.
👉 If you haven’t read our breakdown of why patchwork repairs often fail, check out our guide on Why Planter Boxes Leak for more context.
The Issue: Water Leaks Through a Basement Carpark Ceiling
Water had begun seeping through the ceiling of a basement-level carpark, directly beneath podium-level planter boxes. On inspection, we discovered the existing membrane system inside the planter boxes had deteriorated and delaminated, allowing water to ingress through hairline cracks and weak points in the structure.
Key Findings:
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Visible leaks and staining on the basement ceiling
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Failing membrane at the planter box base and joints
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Signs of water ingress around planter box exteriors
A patchwork repair wouldn’t cut it—this planter box repair needed a full membrane system replacement to eliminate the risk of future leaks. Follow allong below for a step-by-step of how we tackled this project.
Step-by-Step: How We Repaired the Failed Planter Box Membrane
Step 1: Excavate the Planter Box
We removed all soil, plants, and debris from the planter box to expose the failed waterproofing membrane.
Step 2: Clear and Remove Debris
Dispose of any remaining materials, such as old roots or unwanted objects.
Step 3: Clean and Grind Surfaces
Clean the surfaces of the planter box and grind back any delaminated or failed membrane.
Step 4: Apply Primer to Substrate
Apply reactivation primer to the substrate to prepare it for membrane application.
Step 5: Apply Primer to Substrate
Apply reactivation primer to the substrate to prepare it for membrane application.
Step 6: Polyurethane Membrane
U.V Stable polyurethane membrane applied to the internal of the planter boxes.
The Outcome: Leak-Free Basement & Protected Planter Boxes
Once the waterproofing was complete and fully cured, the planter boxes were re-filled with soil and replanted. The podium level was restored, and most importantly, the basement ceiling was protected from further water ingress.
Key Takeaways from this project:
Takeaway no.1
A full membrane revamp is the only reliable solution for planter boxes with advanced membrane failure
Takeaway no.2
Patch repairs often fail, especially when the existing system is aged or applied too thin
Takeaway no.3
Always opt for UV-stable, flexible membranes to withstand plant roots and weather exposure
Waterproofing Service Areas:
Australia-Wide, Key Areas include Queensland, Victoria & New South Wales
We provide waterproofing services Australia-wide, with our head office based on the Gold Coast. Our expert waterproofing solutions cover :
Queensland, including key service areas in Brisbane such as but not limited to Brisbane CBD, Fortitude Valley, Spring Hill, and West End, as well as Gold Coast areas like Southport, Surfers Paradise, Burleigh Heads, Coomera, Robina, and Tweed Heads. From injection waterproofing to membrane waterproofing, we offer a range of reliable solutions for both residential and commercial properties.
Victoria, we provide professional waterproofing services in Melbourne and surrounding areas, including but not limited to Melbourne CBD, Southbank, St Kilda, and Docklands. We also service other parts of Victoria, offering membrane waterproofing and other high-quality waterproofing solutions across regions such as Geelong, Werribee, Ballarat, and beyond. Our injection waterproofing methods ensure long-lasting protection for your property.
New South Wales, Our NSW Metro franchise is available to assist with waterproofing needs NSW Metro. From injection waterproofing to membrane waterproofing, we have the expertise to solve a wide range of waterproofing problems. You can reach our NSW Metro franchise directly at [email protected] or 0418 830 860.
Wherever you’re located, we’re ready to provide reliable, long-lasting waterproofing solutions.
Need Help With a Leaky Planter Box?
If you’re dealing with leaks or suspect issues with your planter box, and require a planter box repair, we offer expert waterproofing and repair services to get your planterbox back in shape. Don’t let water damage compromise your property—contact us today to schedule an inspection!