💦 Waterproofing Solutions Built Around the Application
No two projects present the same substrate, exposure conditions or moisture-related challenges. GMG Waterproofing Solutions works across new builds, renovations and existing properties, with waterproofing and remedial systems selected to suit the substrate, exposure, intended use, site conditions and agreed scope of work.
Internal Wet Areas
External & Below-Ground
Rising Damp Treatment
Remedial Rectification
Bathrooms, laundries, ensuites and other internal wet areas, including preparation, detailing and compliant waterproofing systems.
Balconies, rooftops, terraces, retaining walls, basements, planter boxes and below-ground areas, including hydrostatic pressure and moisture barrier systems
DPC injection and remedial treatment for rising damp, moisture migration, salt-affected masonry and failed or deteriorated damp-proof courses.
Assessment and rectification of failed waterproofing, water seepage, cracking, moisture ingress and compromised waterproofing systems.
.png){kind=small}
Internal Wet Area Waterproofing
Bathrooms, ensuites, laundries, kitchens and other internal wet areas demand careful attention to detail. We focus on correct surface preparation, junction sealing, penetrations and a waterproofing system suited to the substrate and application to support reliable long-term performance. Waterproofing certification is provided for completed installations where required.
Bathrooms & Ensuites
Laundries & Internal Wet Areas
Under-Screed Waterproofing
Over-Screed Waterproofing
Penetrations, Joints & Waterstops
Waterproofing Certification
External & Below-Ground Areas
External and below-ground areas require systems suited to the substrate, exposure and intended use. We waterproof balconies, rooftops, terraces, retaining walls, planter boxes, ponds, water features and trafficable surfaces. Below-ground systems may also include positive or negative side waterproofing, epoxy moisture and vapour barrier systems, and systems designed to address hydrostatic water pressure and seepage through walls, slabs and junctions.
Balconies & Terraces
UV-Resistant Roof Waterproofing
Trafficable Coatings
Retaining Walls & Below-Ground Areas
Planter Boxes
Outdoor Ponds & Water Features
.webp)
Rising Damp Injection Treatment
Rising damp can damage masonry, finishes and internal wall surfaces.
We provide practical assessment and targeted DPC injection treatment
to address moisture rising through masonry.
Rising Damp Assessment
DPC Injection
Salt-Affected Wall Treatment
Internal & External Treatment
Moisture Investigation
Targeted Rectification
.png)
Remedial Waterproofing
& Rectification
We assess the likely cause of waterproofing failure and recommend an appropriate rectification approach for water seepage, cracks, failed junctions and damaged systems.
Failed System Assessment
Water Seepage
Assessment & Rectification
Crack & Joint Rectification
Balcony & Wet Area Rectification
Membrane Replacement or Overlay Systems
Manufacturer-Specified Solutions
Licensed, Insured & Compliant Waterproofing
GMG Waterproofing Solutions is licensed and fully insured, with waterproofing installations completed using appropriate system specifications and detailing for the application. Where applicable, waterproofing certification can be provided for work completed by GMG, with installations carried out in accordance with relevant manufacturer requirements, NCC provisions and Australian Standards.​
​
Whether the project involves a new wet area, external waterproofing or remedial rectification, our focus is on correct preparation, system selection and installation — not shortcuts.
Why Professional Waterproofing Matters
Reliable waterproofing depends on appropriate system selection, correct substrate preparation and careful detailing at junctions, penetrations and terminations. Professional installation helps reduce the risk of moisture ingress,
premature system failure and costly rectification later.
Proudly servicing the Blue Mountains, Lithgow and Central West NSW
.png){kind=small}
Our Services
Areas Covered
Blue Mountains, Lithgow & Central West NSW
Mon-Sat
7:30am-4:30pm
Licence Number
NSW 328089C