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Balcony & Terrace Waterproofing
Installation of high-performance waterproofing systems for balconies and terraces to prevent leaks, structural damage, and costly repairs — ensuring long-term protection and compliance with Australian Standards.

Balconies and terraces are among the most common sources of water ingress in multi-storey residential and commercial buildings. Without robust waterproofing, rainwater and moisture penetrate into the slab, joints, and wall interfaces, causing concrete spalling, rusted reinforcement, tile debonding, mould growth, and internal water damage.

At Atomic Projects, balcony and terrace waterproofing isn’t just a surface treatment — it’s a full-system solution designed to protect the structure for decades. We use proven products, precise preparation methods, and industry-leading detailing techniques to ensure zero-compromise leak prevention.

Our Balcony & Terrace Waterproofing Process

  1. Investigation & Assessment
    • Moisture mapping, core drilling, and inspection of existing membranes.
    • Identify slab cracks, failed sealants, poor drainage points, and weak detailing at junctions.
  2. Surface Preparation
    • Remove all tiles, screed, and defective waterproofing layers.
    • Grind back surfaces for optimal adhesion.
    • Repair cracks and level uneven areas with polymer-modified repair mortar.
  3. Drainage Upgrades
    • Ensure correct falls (minimum 1:100) for water runoff.
    • Replace or upgrade drains, puddle flanges, and overflows.
  4. Membrane Installation
    • Liquid Membranes: Flexible, seamless, and ideal for complex detailing.
    • Sheet Membranes: Superior puncture resistance, suited for high-traffic areas.
    • Extend membrane vertically up walls and into drainage points for a full tanking effect.
  5. Critical Junction Detailing
    • Reinforce corners, wall-to-floor junctions, balustrade posts, and door thresholds.
    • Use compatible sealants for movement joints to avoid premature failure.
  6. Finishes & Protection
    • Protect membrane with screed, tiles, or pavers set on pedestals.
    • Use slip-rated finishes suitable for outdoor exposure.

Common Balcony & Terrace Waterproofing Failures We Fix

  • Poor falls or ponding water on tiles.
  • Membranes not extending behind skirting tiles or wall claddings.
  • Incompatible sealants and joint detailing.
  • Penetrations (e.g., balustrade posts) without waterproof collars.
  • Incorrect or absent drainage flanges.

Why Atomic Projects for Balcony & Terrace Waterproofing

  • Proven Leak-Free Track Record: Hundreds of balconies remediated with zero call-backs.
  • Product Selection Expertise: Systems matched to UV exposure, traffic loads, and building movement.
  • Compliance Guarantee: All works meet or exceed AS 4654.1 & AS 4654.2 for waterproofing membranes.
  • Integrated Approach: Often carried out alongside façade, balustrade, and structural repairs for full protection.

A balcony or terrace leak is never “just a drip.” Left unresolved, it becomes a structural liability that can cost hundreds of thousands to fix. Our approach eliminates the guesswork, addresses the root cause, and delivers a watertight guarantee — protecting both the building and its value.

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If you’re ready to get started, we're ready to help.

Take the next step and let’s build something that lasts.

 

📞 Call Us: 0410 515 509

✉️ Email Us: hello@atomicprojects.com.au

 

— Ben Tran, General Manager, Atomic Projects

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