Residential & commercial waterproofing Solutions

Resinous & Cementitious waterproofing Membranes 

We provide waterproofing and protective coating solutions for a wide range of residential, commercial and industrial applications.

We import raw materials into Australia and manufacture resinous coating systems locally. This allows us to supply the right material for each project, carry out professional installation, and provide ongoing maintenance support to help protect your property for many years.

Our after-sales service includes planned maintenance and discounted maintenance support over the coming years. We understand the specific requirements of the food industry, including hygiene, durability, chemical resistance, slip resistance and ease of cleaning. Our goal is to help you minimise the overall cost of installation, maintenance and future refurbishment while maintaining a safe and compliant working environment.

We can also assist with final waterproofing and protective coating inspections and provide the required documentation and certificates where applicable.

Alka Coatings serves a broad range of commercial and industrial sectors across Australia and the Pacific region.

Positive and Negative Waterproofing Pressure

Waterproofing systems are generally designed to resist either positive or negative hydrostatic pressure.

Positive-Side Waterproofing

Positive-side waterproofing is applied to the side of the structure where water pressure is coming from. In this situation, water pressure pushes the membrane against the substrate, helping it remain in contact with the surface. A common example is a swimming pool, where the waterproofing membrane is applied to prevent water from escaping through the concrete structure.

Typical applications include:

• Bathrooms and kitchens
• Basements and retaining walls
• Swimming pools and water tanks
• Balconies and terraces
• Green roofs and rooftops
• Planter boxes and podium decks

Negative-Side Waterproofing

Negative-side waterproofing is applied to the opposite side of the water pressure. In this case, water pressure pushes against the membrane from behind the substrate, which can create higher stress on the coating system.A common example is an existing basement wall where water is entering from the outside, but the waterproofing repair must be carried out from inside the basement.Negative-side waterproofing requires careful substrate preparation, correct product selection and strong adhesion to resist water pressure pushing the membrane away from the surface.

Types of Waterproofing Materials

Different waterproofing systems are used depending on the substrate, water pressure, exposure conditions, movement, chemical exposure and project requirements. Common waterproofing materials include:

• Liquid-applied waterproofing membranes
• Cementitious waterproofing systems
• Polyurethane liquid membranes
• Water-based flexible membranes
• Epoxy waterproofing systems
• Polyurea waterproofing membranes

Each system has different strengths, limitations and suitable areas of use. Choosing the correct system is critical to long-term performance.

Cementitious Waterproofing

Cementitious waterproofing is one of the most widely used waterproofing methods in construction. It is commonly supplied as a cement-based product that is mixed and applied directly to concrete or masonry substrates.Cementitious systems are practical, cost-effective and easy to apply, making them suitable for many internal wet areas and civil infrastructure applications.

ALKA Coatings offers Alka Cement, a one/two-component cementitious waterproofing membrane designed for durable and versatile use across construction and repair projects, Because cementitious waterproofing systems are generally less flexible than liquid polymer membranes, they are best suited to areas with limited substrate movement. In areas where improved adhesion or surface sealing is required, ALKA can recommend suitable primers such as Alka Prime T, a one-component water-based primer designed to improve surface preparation and system performance.Typical applications include:

• Internal wet areas
• Bathrooms and toilets
• Water treatment plants
• Sewage treatment facilities
• Bridges and tunnels
• Dams and retaining structures
• Railway and subway structures
• Marine ports and docks
• Parking structures
• Concrete channels and civil infrastructure

Water-Based Waterproofing Membrane

Water-based waterproofing membranes are liquid-applied systems designed to form a flexible, seamless membrane after curing. They are easy to apply and suitable for a wide range of residential and commercial waterproofing applications. ALKA TEN is a one-component water-based waterproofing membrane formulated for ease of use, flexibility and reliable protection against water ingress.It can be applied by roller, brush, trowel or spray, depending on the project requirements and substrate condition. The system is typically applied in two coats to achieve the required film build and performance.Compared with rigid cementitious systems, water-based membranes offer improved flexibility and crack-bridging capability. This allows the membrane to accommodate minor substrate movement and reduce the risk of cracking or rupture.Typical applications include:

• Bathrooms and laundries
• Balconies and terraces
• Internal wet areas
• Light-duty waterproofing areas
• Concrete and masonry substrates
• Residential and commercial construction

Polyurethane Membrane Waterproofing

Polyurethane waterproofing membranes are high-performance liquid-applied systems commonly used in areas exposed to weathering, UV exposure and structural movement.They are often used on flat roofs, podium decks, balconies and external areas where flexibility and long-term durability are required.Polyurethane membranes provide excellent elongation and crack-bridging performance; however, they are sensitive to substrate moisture. Before application, the concrete moisture condition must be assessed carefully. If applied over damp or poorly prepared concrete, polyurethane membranes may blister, peel or debond over time. Correct surface preparation, moisture testing and primer selection are essential for successful polyurethane waterproofing.

Typical applications include:

• Flat roofs
• Podium decks
• Balconies and terraces
• Exposed concrete slabs
• External waterproofing areas
• Areas requiring high flexibility

Polyurea Membrane Waterproofing

Polyurea waterproofing is a high-performance, spray-applied membrane system designed to create a seamless, flexible and highly durable protective barrier over concrete, steel and other suitable substrates.

Polyurea systems cure extremely fast and form a continuous waterproofing membrane with excellent resistance to water ingress, weather exposure, abrasion and substrate movement. This system is ideal for projects where fast return to service, crack-bridging performance and long-term waterproofing protection are required. Because polyurea is applied using plural-component spray equipment, it can be installed quickly over large areas and complex shapes, including vertical surfaces, curved details, penetrations and joints. Typical applications include:

• Roofs and podium decks
• Bridges and civil structures
• Water-retaining structures
• Tank and bund linings
• Car park decks
• Concrete protection
• Industrial waterproofing areas
• Fast-track repair and refurbishment projects

Choosing the Right Waterproofing System

The correct waterproofing system depends on several factors, including:

• Substrate type and condition
• Positive or negative water pressure
• Internal or external exposure
• Crack movement and structural movement
• Chemical exposure
• UV exposure
• Required service life
• Application method and project access
• Return-to-service requirements

For best results, each waterproofing system should be selected based on the actual site conditions and performance requirements.

Contact ALKA Coatings for project-specific waterproofing recommendations, product selection and technical support.

• Products On Offer

  • Alka Cement, 2-componenet cementitious waterproofing membrane | Data Sheet
  • Alka TEN | 1-componenet, general purpose acrylic waterproofing membrane | For Wet Areas & Exterior 
  • Alka 310 | 1-component, low VOC, moisture-curing, elastomeric waterproofing membrane
  • Alka 311 | 2-components, VOC-free, quick-curing, elastomeric PU waterproofing membrane
  • Alka 312 | 1-component, low VOC, moisture-curing, elastomeric waterproofing membrane  

  • Alka 801 | 2-components, spray-in-place, solvent-free, flexible & 100% solids polyurea elastomer  

  • Alka 802 | 2-components, spray-in-place, solvent-free, flexible & 100% solids polyurea elastomer