Balcony Waterproofing with Polyurethane Systems
At Waterproof Doctor, we specialise in balcony waterproofing and under-tile waterproofing using advanced polyurethane waterproofing systems.
This proven method creates a seamless, flexible, and highly durable waterproof layer that protects your balcony, terrace, or rooftop deck from leaks, damp, and long-term water damage.
Whether you’re building a new home or repairing a leaking balcony, our polyurethane systems provide reliable, long-lasting protection designed for South Africa’s harsh weather conditions.
What Is Polyurethane Waterproofing?
Polyurethane waterproofing is a liquid-applied system that cures into a tough, elastic membrane. Unlike older torch-on or sheet membranes that can lift, tear, or fail at joins, polyurethane forms a single, continuous barrier with excellent flexibility and adhesion.
It’s ideal for:
Balcony waterproofing under tiles
Rooftop and terrace waterproofing
Bathroom and shower waterproofing
Concrete decks and exposed surfaces
Once applied, the polyurethane membrane stretches with your structure’s natural movement, preventing cracks, leaks, and water ingress over time.
Our Waterproofing Process
Surface Preparation
Every successful waterproofing project starts with a clean, dry, and solid surface. We prepare and repair the concrete or screed to ensure maximum adhesion.Priming
A high-quality polyurethane primer is applied to seal the substrate and promote a strong bond between the surface and the membrane.Application of the Polyurethane Membrane
The polyurethane is applied in two or more coats, either by roller, brush, or spray. Around drains, wall junctions, and corners, we embed a reinforcing mesh for extra strength and durability.Curing and Protection
Once cured, the membrane forms a seamless, rubber-like barrier. It’s then protected with a geotextile layer, protective screed, or directly tiled over with flexible tile adhesive.Tiling and Sealing
Finally, we install tiles using exterior-grade adhesives and grout, sealing all joints and perimeters with polyurethane or hybrid sealants to ensure a watertight finish.
Benefits of Polyurethane Waterproofing
Seamless and fully bonded – no joints or overlaps
Extremely flexible – handles movement and temperature changes
UV and weather resistant – perfect for South African climates
Excellent adhesion to concrete, screed, and tile surfaces
Long-lasting and low-maintenance
Why Choose Waterproof Doctor?
As a trusted waterproofing company in South Africa, we deliver professional results that last. Our team uses certified polyurethane waterproofing products from leading manufacturers, applied according to strict industry standards.
We take care of every detail — from ensuring proper balcony falls and drainage, to sealing wall junctions and door thresholds — to guarantee your property stays dry and protected for years to come.
Whether you need balcony leak repairs, roof deck waterproofing, or under-tile waterproofing for new construction, we provide a tailored solution backed by experience, quality workmanship, and reliable guarantees.
Get a Quote Today
If you’re experiencing balcony leaks, damp walls, or efflorescence under tiles, contact Waterproof Doctor today.
We’ll inspect, diagnose, and provide a detailed quotation for a complete polyurethane waterproofing solution that ensures your balcony remains watertight, beautiful, and maintenance-free.
📞 Call us today or fill out our online contact form to book your balcony waterproofing inspection.
