Service Details
Basements are highly exposed to groundwater and hydrostatic pressure, making them prone to leaks, concrete spalling, dampness, mould growth and structural deterioration. S&S Remedial Services delivers engineered, AS 4654.2-compliant basement waterproofing systems designed to withstand Queensland’s high water tables and severe hydrostatic pressure.
We provide remedial waterproofing for residential, commercial and strata buildings throughout Brisbane, the Gold Coast, Logan and surrounding areas.
For pre-purchase property water problem inspections, visit our dedicated service page.
Basement Waterproofing Solutions
Negative-Side Waterproofing (Interior)
This waterproofing basement services is designed for existing basements, lift pits, and underground car parks where external excavation is impossible or cost-prohibitive.
Positive-Side Waterproofing (External)
Applied to the outside of the foundation wall, it stops water before it reaches the structure. It involves excavating around the foundation and applying waterproof membranes, drainage boards, and footing drains to relieve hydrostatic pressure and redirect water away.
High-Pressure Polyurethane (PU) & Epoxy Crack Injection (Concrete)
For active leaks and structural cracks in concrete walls and floors, we use minimally invasive resin injection waterproofing.
Liquid Membrane Waterproofing
Applying seamless, flexible polyurethane basement waterproofing coatings directly onto concrete, block, or masonry surfaces, both above and below ground.
Damp-Proofing & Mould Remediation (Brick Wall)
Addressing rising damp and humidity-related issues common in Queensland homes.
Why Choose S&S Remedial Services
Forensic Diagnostics: Rather than just covering surface leaks, they use advanced diagnostic tools—including thermal imaging, moisture mapping, and hydrostatic testing—to locate the exact path of water ingress and treat the root caus.
Full QBCC Licensing & Australian Standards Compliance: We hold a current QBCC license: 15438819). All commercial & residential basement waterproofing strictly complies with the National Construction Code (NCC) and relevant Australian Standards (AS 3740 and AS 4654).
Diagnostic Approach: Every project begins with a root-cause assessment to identify underlying moisture or structural failure points before applying tailored solution systems.
20+ Years of Industry Experience: Backed by over two decades of hands-on experience in structural repairs, concrete crack injections, and rising damp control.
Tailored Water Management Systems: Depending on the site conditions, we combine elastomeric membranes with interior perimeter drainage, sub-floor ventilation, and sump pump installations to relieve hydrostatic pressure permanently.
Full-Service Waterproofing: From interior drainage systems and sump pump installation to exterior excavation, resin crack injection and polyurethane basement waterproofing, we handle the full range of waterproofing methods and recommend what actually fits your home
Our Basement Waterproofing Process
Basement Inspection and Moisture Assessment
Drainage and Water Management (optional)
Where waterproof coatings alone cannot adequately manage groundwater or hydrostatic pressure, additional measures may be recommended, such as improved external drainage, internal collection channels or a sump-pump system.
Mechanical Surface Preparation & Crack Chasing
Waterproofing Membrane Installation
The selected membrane is applied in the required number of coats and at the specified thickness. Depending on access and site conditions, this may include: Negative-side waterproofing membranes, liquid waterproofing membranes, epoxy-based moisture barriers and positive-side membranes where the exterior surface is accessible
Active Leak Sealing (Polyurethane Injection)
Active leaks are controlled before the main membrane is applied. Depending on the condition, treatment may include: polyurethane resin injection for wet or leaking cracks, pressure injection grouting for voids and water pathways and joint sealing around penetrations and construction joints.
Quality Assurance & Compliance Sign-Off
The completed membrane system is verified for complete seamless encapsulation and proper Dry Film Thickness (DFT). All works are signed off in full compliance with QBCC licensing rules, the National Construction Code (NCC), and relevant Australian Standards (such as AS 3740 / AS 4654 series).
COMPLIANCES
Protect your basement and building foundation with professional waterproofing solutions you can rely on.
Stop Water Problems Before They Get Worse
07 2812 2774
From residential homes to commercial and strata buildings, we deliver tailored waterproofing systems built for long-term performance.
Brand We Trust
Testimonials
“We had persistent water seepage through our basement walls for over a year. Their waterproofing solution was thorough and professional, addressing the root cause rather than just patching it. Six months on, still completely dry. Highly recommend their service.”
Daniel Osei, Broadbeach, Gold Coast
“Our basement flooded twice before we invested in professional waterproofing basement services. The difference is night and day — no more puddles, no more anxiety during rainy season. The technicians were punctual, tidy, and clearly knew exactly what they were doing throughout.”
Liam Foster, Robina, Gold Coast
“Damp-proofing our basement had been on our list for ages, and I’m glad we finally did it. The waterproofing basement contractor identified hidden leaks we didn’t even know existed. Professional, efficient, and the warranty gives real peace of mind for years ahead.”
Marcus Webb, Southport, Gold Coast
“Our basement had a persistent damp problem that regular sealants never fixed. The waterproofing contractors installed a proper drainage system and exterior coating, and it’s been completely dry since. Professional crew, clear communication, and results that have genuinely exceeded our expectations.”
Nathan Pryce, Mermaid Beach, Gold Coast
“After years of dealing with a damp basement, we finally called in the basement waterproofing experts. The team diagnosed the issue fast, sealed everything properly, and now our basement stays bone dry even during heavy storms. Couldn’t be happier!”
James Whitfield, Ashgrove, Brisbane
“I was skeptical about basement waterproofing costs, but after seeing cracks and moisture damage worsen, we took the plunge. Best decision ever. The PU liquid membrane installation was seamless, and our foundation feels solid and protected now, even after weeks of rain.”
Ethan Grosvenor, Kelvin Grove, Brisbane
“Our garage basement was constantly damp no matter the season. After a full waterproofing job — external coating plus internal drainage — the moisture problem completely disappeared. The crew was reliable, explained the process clearly, and cleaned up perfectly afterward.”
Harrison Doyle, Miami, Gold Coast
“Our basement wall cracks were letting in water every time it rained heavily. The basement waterproofing specialists used an injection method that sealed everything from the inside out. Professional, punctual, and the results have held up through several major downpours since.”
Benjamin Souter, Spring Hill, Brisbane
What is the best waterproofing method for basements?
The best long-term basement waterproofing method is usually a positive-side waterproofing system combined with effective drainage. It prevents groundwater from reaching the basement structure rather than trying to control it after penetration. A comprehensive system may include:
- An exterior liquid waterproofing membrane
- Sealing construction joints and penetrations
- Drainage cells or protection boards
- Free-draining backfill
- Subsoil or perimeter drains
- Correct surface grading and stormwater management
However, exterior excavation is not always practical for existing basements. In these cases, the most effective solution is often a combined internal basement waterproofing system, such as:
- Polyurethane resin injection to stop active leaks through cracks and joints
- Epoxy injection for suitable dry, stable structural cracks
- Negative-side waterproofing membranes applied to internal walls and floors
- Joint sealing and detailing around wall–floor junctions and penetrations
- Internal drainage and sump pumps where groundwater pressure cannot be eliminated
There is no single method that suits every basement. The best waterproofing basement walls and floors depends on the water source, hydrostatic pressure, concrete condition, crack movement, drainage and accessibility.
Project Gallery
Commercial Basement Waterproofing
Exterior Basement Waterproofing
Interior Basement Waterproofing
Residential Basement Waterproofing
Interior Basement Waterproofing
House Basement Waterproofing
Concrete Block Basement Waterproofing
External Basement Waterproofing
Frequently Asked Question
Can you waterproof over old basement waterproofing?
For drainage systems (French drains, sump pumps), an old failing system typically needs replacing rather than layering over.
A professional basement waterproofing inspection helps determine if the old system just needs supplementing or a full redo.
Basement waterproofing cost per square foot in Brisbane or Gold Coast?
Basement waterproofing costs between $3 and $10 per square foot on average, with most full-scale projects settling around $5 to $8 per square foot including materials and labor.
For a standard 1,000-square-foot basement, total project costs typically range from $3,000 to $10,000+, depending on whether you address the issues from the inside or the outside.
| Waterproofing Approach | Cost per Sq. Ft. | Avg. Total Cost (1,000 sq. ft.) | Primary Work Included |
| Interior Sealants & Paint | $1 – $4 | $1,000 – $4,000 | Wall coatings, localized vapor barriers, and minor crack sealing. |
| Interior Drainage Systems | $3 – $8 | $3,000 – $8,000 | Sub-floor trenching, perimeter drain tile, and sump pump installation. |
| Exterior Excavation & Membrane | $8 – $15+ | $8,000 – $15,000+ | Full perimeter trenching, elastomeric/dimple membranes, and exterior French drains. |
Key Factors Influencing Cost
Method Required: Interior perimeter drains are priced heavily by linear foot (typically $50 to $100 per linear foot), whereas exterior work includes expensive heavy-equipment excavation labor.
Foundation Depth & Access: Deep basements require deeper excavation. Obstacles like decks, concrete patios, or landscaping significantly increase labor rates.
Finished vs. Unfinished: Unfinished basements allow direct access to concrete. Finished basements require tear-out and restoration of drywall, flooring, and framing.
Can waterproofing basement walls from inside prevent mould?
How long does waterproofing basement walls from inside last?
Can waterproofing basement contractors repair active water leaks?
What services do basement waterproofing specialists typically provide?
Experienced basement waterproofing experts offer a full spectrum of moisture management services, including:
- Sub-floor drainage channel and sump pump installation.
- External excavation, membrane application, and drainage cell placement.
- Polyurethane and epoxy crack injection for concrete foundations.
- Humidity control, vapor barrier installation, and basement waterproofing mold remediation.
What pulls moisture out of a basement?
- Dehumidifiers — the most direct and effective tool for actively removing moisture from the air
- Proper ventilation — exhaust fans or improved airflow
- HVAC systems that include basements in conditioning/circulation
- Sump pumps — remove standing water before it evaporates into the air
- Moisture barriers/vapor barriers — don’t remove moisture but block it from entering in the first place
What are the common causes of moisture in a basement?
Clogged or short downspouts dumping water near the foundation
Cracks in the foundation wall or floor
High water table or hydrostatic pressure pushing groundwater through
Condensation from humid air meeting cool basement surfaces
Poor or missing exterior drainage
Plumbing leaks
Window wells without proper drainage
Can a basement be waterproofed without excavation?
How do I choose reliable waterproofing basement contractors?
How do I choose the best basement waterproofing solutions (Brisbane or Gold Coast) for my home?
Choosing the right method comes down to three key factors:
- Source of the Leak: Hydrostatic pressure under the slab calls for internal drainage, while surface runoff penetrating walls requires exterior protection.
- Property Access: Exterior excavation requires heavy equipment and space around the foundation, whereas interior methods cause minimal disruption to your yard.
- Budget: Interior basement waterproofing systems are generally more cost-effective, while full exterior excavation requires higher initial investment.
How do I choose the right basement waterproofing company for my home?
Look for these core credentials when evaluating a basement waterproofing company:
- Licensing & Insurance: Ensure they carry trade licenses, public liability insurance, and worker’s compensation.
- Workmanship Warranties: Reputable companies offer long-term, transferable warranties (often 20+ years or lifetime) on interior drainage systems.
- On-Site Diagnostics: Avoid companies that give exact quotes over the phone without conducting an in-person moisture inspection.
What should I ask a basement waterproofing company before hiring them?
Before signing a contract, ask these key questions:
Do you offer both external and internal basement waterproofing solutions, or just one method?
Will the work require structural modifications or concrete trenching?
Is your warranty transferable to future homeowners if I sell the property?
Are local council permits or building code inspections required for this scope of work?