Liquid Applied and Torch On Membranes

What is a waterproof membrane?

A waterproofing membrane is a system comprising of a thin layer of water-tight material that is placed over a surface, which is continuous and prevents water from passing through it. A waterproofing membrane should be strong, but flexible enough to permit it to conform to any surface shape it is placed upon, allowing it to be turned up and over walls or other construction features. It should be resistant to tearing and stretchy enough to cover cracks and enable movement with the structure. If the waterproofing membrane will be exposed to sunlight it should be UV stable as well.

What are the types of waterproofing?

BUSS’ waterproofing specialists recommend and install many types of membranes to complete a variety of waterproofing works.  Each situation is individually assessed and the most appropriate type of waterproofing is used, or recommended for use, based on the needs or requirements of the situation and environment.

 The most widely used types of waterproofing include the following:

  • Liquid applied membrane;
  • Torch-on membrane;
  • Applied chemical solutions;
  • Polyurethane sealants;
  • Hypalon bandages; 
  • Loose laid sheet membrane; and
  • Tanking.


    Did you know that currently waterproofing is unregulated in WA? How do you know who to trust? Read more...

    What areas of a structure often require membranes?

    As torch on membranes often need to be more durable than liquid applied ones, the below are the areas where they are most commonly applied (post waterproofing):

    Below ground

     Basements, carparks, cellars, concrete slabs and remedial applications, foundation and structural walls and tunnels.


    Bathrooms/ensuites, laundry rooms, commercial processing facilities, plant rooms, powder rooms and toilets.


    Balconies, carparks, decks, garden beds, parapet walls, ponds, rooftops, water features and water tanks.

    What is liquid applied membrane?

    A liquid applied membrane is a waterproofing membrane with a high viscosity formulation designed for application on vertical or horizontal surfaces, external or internal and below or above ground projects.  It is joint free and care must be taken during application to ensure the correct thickness as it can tear or break if it’s too thin. It is either hand or spray applied and is extremely flexible, with seamless and robust bonding and most suited for complex and sophisticated building designs; ideal for balconies, podium decks, roofs, bathrooms, floors, carparks and municipal water tanks.

    How to remove torch on membrane?

    A torch on membrane is best removed by professionals as speciality tools and equipment are required and care must be taken so as not to damage the substrate.  Once the majority of the membrane has been removed, the area will be grinded and acid/pressure washed to remove fragments and residue. The removal of a torch on membrane can be a very difficult task due to the strong bonding of the materials and due care must be taken to ensure effective removal. 

    How to apply torch on membrane?

    A torch on membrane is a sheet membrane system applied by flame bonding; it allows for uniform thickness, is stable at extreme temperatures, has high impact resistance, high elasticity and can be painted over.  A torch on membrane is applied to a substrate that is dense, rigid and stable enough to support the membrane system, and designed to incorporate the falls, drains, outlets and sumps necessary for sufficient drainage.  In order to ensure the membrane adheres properly, the substrate must be prepared thoroughly, effectively primed prior to application and adequately coated for UV protection (as/if required).

    While installation of the flat sheet is relatively simple, the thorough surface preparation and the detailing required for the heat fusing of the membrane to the underlying substrate requires precision and experience to obtain a very tight seal.  The torch on membrane system is best applied by experienced professionals, with the correct combination of skills, protective equipment and tools, to ensure adherence to current Australian Standards, safety, longevity and product warranty. 

    Waterproofing membrane v2

    How BUSS can help

    Some of the major causes of waterproofing failure is poor workmanship, incorrect installation methodology and unsuitable product specification.  The failure of a waterproofing system has significant implications to a building or structure. It poses a threat to the structural integrity, reduces the value of the property and presents health and safety issues in the form of mould and bacterial allergies. 

    Drawing on our experience and industry best practice, BUSS’ waterproofing specialists have been applying their expertise for more than 20 years to commercial, industrial and residential structures in Perth and the metro area, as well as Regional WA. 

    Our proven track record in effective remedial solutions and quality workmanship, supported by our affiliation with leading industry organisations – Australian Institute of Waterproofing, the Australasian Concrete Repair Association and the Strata Community Association, along with our Cert III accredited applicators, offer our clients peace of mind for all their waterproofing needs.  Our association with these leading organisations allows us the advantage of being one of the most qualified, trusted and reputable remedial contractors in WA.

    Our waterproofing services include:  leak detection, site advice/investigation report, solution/scope of work, corrective actions and repairs, waterproofing and general consultancy.  For more information, please feel free to contact us below, or call us on08 9444 1732 for more information.

    Leaking Planter Boxes

    Our projects

    Our Waterproofing Services