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Remedial Waterproofing Specialists In Sydney

30 years’ experience

Real-time pricing

95% repeat client rate

Quality over quantity

Watertight Protection Against Water Damage

Because every waterproofing project is unique, we carefully assess, select and implement the best waterproofing solutions to resolve causes and mitigate future water damage. Whether you’re dealing with persistent leaks or structural dampness, our remedial waterproofing specialists ensure long-lasting, compliant results for both residential and commercial properties in Sydney.

For robust remedial waterproofing solutions that comply with industry standards and regulations, contact Multifix Group today.


Our 3-Step Process

Step 1: Water Leak Detection Test

Our rising damp specialist in Sydney inspects affected areas for visible signs of water intrusion and carefully evaluates moisture content to identify underlying issues before restoration.

Step 2: Engineer's Report

We provide a comprehensive report that identifies the sources of water intrusion and any structural damage caused by leaking. In the report, we recommend remedial measures and waterproofing solutions, along with a competitive and realistic cost estimate.

Step 3: Best Waterproofing Method Solutions

We get to work applying the best waterproofing methods identified in our engineer’s report, including waterproofing membrane thickness and adhesion tests to ensure long-term durability and compliance with relevant building regulations and codes.

Rising Damp: Spot It Early, Fix It Permanently

Rising damp is one of the most frequently overlooked issues in Sydney’s older buildings. If ignored, it can lead to major damage and costly restoration.

Common warning signs include:

  • Blistered or flaking paint near the skirting line
  • Salt deposits (efflorescence) on walls
  • Persistent musty odours
  • Warped timber or stained plaster

As top notch rising damp specialists in Sydney, we conduct:

  • Moisture mapping to trace water travel
  • Salt analysis to assess masonry damage
  • Cavity inspections to evaluate structural impact

Our treatments include breathable renders, damp-proof coursing and subfloor ventilation. These are designed to respect the building’s material integrity while eliminating moisture pathways.

Our Full Range Of Remedial Waterproofing Services

  • Liquid membranes torch on membranes
  • PVC membranes
  • Butynol membranes
  • Tanking membranes
  • Hypalon bandages, including Combiflex
  • Cement-based ‘negative waterproofing’
  • Crack injection using epoxy & polyurethane materials
  • Polyurethane, silicone and polymer sealants
  • Grout injection using gravity and high
  • Pressure pumps
  • Retro-fit waterstops

0414 660 016

Waterproofing Membrane Testing: Don’t Skip This Critical Step

Waterproofing is only as good as its application. That’s why the Multifix Group conducts a waterproofing membrane thickness and adhesion test before and after installation.

This test helps ensure:

  • Membranes are applied at the manufacturer-recommended thickness
  • Adhesion to the surface is uniform and effective
  • Long-term durability and protection against leaks
  • Compliance with Australian waterproofing standards

Without this verification, even premium membranes can fail prematurely, leading to avoidable repairs and downtime.

Routine Waterproofing Audits For Ageing Buildings

For buildings nearing or exceeding the 10-year mark, proactive waterproofing audits are a smart investment.

Our inspections often detect issues including:

  • Bubbling or blistering of membranes
  • Shrinking or peeling of sealants
  • Hairline cracks or substrate delamination

Using tools like the waterproofing membrane thickness and adhesion tests, we provide:

  • Detailed condition reports
  • Budget-friendly remedial works
  • Maintenance timelines to reduce lifecycle costs

Specialist Plans For Complex And Heritage Builds

As seasoned remedial waterproofing specialists, the Multifix Group frequently collaborates on technically complex or heritage-listed sites.

Our tailored plans are ideal for:

  • Underground carparks
  • Rooftop podiums and exposed balconies
  • Brick and stone heritage buildings
  • Sensitive strata or council-supervised projects

At Multifix Group, we align materials and application methods with the age, structure and ongoing use of the building, ensuring functional repairs that preserve architectural character.

Get In Touch

Contact Sydney’s Waterproofing Experts Today

Protect your property with trusted remedial waterproofing specialists who deliver durable and cost-effective solutions. Whether it’s a residential building or a commercial structure, we’ll help you eliminate leaks, control rising damp and extend your building’s lifespan.

Call our rising damp specialists around Sydney today at 0414 660 016 or email us at info@multifixgroup.com.au. Schedule an inspection or request a quote for professional waterproofing membrane thickness and adhesion test and complete waterproofing services anywhere in Sydney.

Latest Projects

We value your time and budget. That’s why we prioritise detailed front-end planning and preparation alongside clear delivery goals for every project.


3 Amhurst Street Cammeray Tarella House circa 1880

5 Station Street Mittagong Former Post Office circa 1890

29 Challis Ave Potts Point circa 1889

230 Sussex Street Sydney Foley Bros circa 1886

9 Fraser Street Randwick Melrose

The Manse Surgery 1 Regent Street Paddington

Frequently Asked Questions (FAQs)

A remedial waterproofing specialist identifies, tests and repairs water ingress problems in existing buildings. They diagnose the cause of leaks, moisture penetration, failed membranes, rising damp and structural dampness using advanced tools and moisture-mapping techniques.

You should call a remedial waterproofing specialist when you notice persistent damp spots, mould, bubbling paint, efflorescence, cracks in wet areas or repeated leaks, signs that your building’s waterproofing system is no longer performing as it should.

Membrane testing is recommended every 2–3 years for commercial properties and every 3–5 years for residential homes. Regular testing helps detect early deterioration, weak adhesion or thinning membranes before major structural damage occurs. In high-moisture environments or older buildings, more frequent testing ensures long-term durability and compliance.

Typical warning signs your property may need remedial waterproofing include peeling paint, damp wall patches, a musty smell, mould growth, loose or cracked tiles, swollen skirting boards, water stains on ceilings and visible efflorescence. If left untreated, moisture can lead to structural weakening, so these symptoms should prompt immediate assessment by experienced remedial waterproofing specialists.

Professionals use calibrated electronic gauges and specialised pull-off adhesion testing equipment to measure membrane thickness and bonding strength. These tests determine whether the membrane meets manufacturer specifications and whether it has deteriorated over time. Accurate measurements help pinpoint failures and ensure reliable long-term waterproofing performance.

Standard waterproofing is installed during the construction phase to prevent future water damage. Remedial waterproofing, however, focuses on diagnosing and repairing issues that have already developed in an existing structure. It requires advanced testing, a precise understanding of building defects and specialised methods that work around finished surfaces, older materials and occupied spaces.

Rising damp is caused by groundwater travelling upward through porous materials like brick, stone, render or mortar. This occurs when a damp-proof barrier is missing, damaged or no longer functioning. While more common in older buildings, rising damp can affect new structures if damp-proofing systems were poorly installed or compromised over time.

Common treatments include chemical damp-proof course injections, moisture barrier installation, salt extraction, wall ventilation improvements and targeted masonry repairs. When applied correctly by a rising damp specialist near Sydney, these treatments can last decades. Long-term results depend on moisture control, correct material use and regular maintenance.

Professional testing identifies hidden moisture pathways, membrane failures and weak adhesion that are not visible on the surface. Accurate testing prevents misdiagnosis and ensures repairs address the underlying cause rather than just the symptoms. This ensures long-term waterproofing performance, reduces future repair costs and protects building integrity.

Rising damp specialists use moisture meters, thermal imaging, calcium carbide tests and salt analysis to locate moisture sources. Once identified, they apply solutions like chemical damp-proof courses, breathable render systems, sub-floor ventilation and moisture barriers. These targeted treatments stop the moisture from travelling and restore the building’s structural health.

A waterproofing membrane thickness and adhesion test measures the membrane’s depth and bonding strength to confirm whether it meets performance standards. Thickness gauges ensure the membrane has been applied consistently, while adhesion tests check that it is securely bonded to the substrate. These assessments are crucial for identifying failures early, ensuring compliance and ensuring long-term protection against water ingress.

Contact the Multifix Group today to know more: 0414 660 016 or info@multifixgroup.com.au.