Best Waterproofing Product for Retaining Walls

Waterproofing Retaining Walls 

Below Ground areas are difficult to waterproof effectively.

  • With contemporary design, living areas are often at basement level or below natural ground level.
  • In these cases there is always the potential for movement of ground water and surface water to run-off into the building structure.
  • The perimeter of the building, particularly perimeter walls, often retain this water.
  • The result being accumulation of ground water against the outside face of the perimeter walls where they are below ground level.
  • And then the problem may extend beneath the timber floors or slab and even causing water up into walls.
  • Remember concrete, masonry and many natural types of stone are inherently vulnerable to water penetration.

You must have a robust, retaining wall waterproofing system between the external face of walls and the adjacent ground material.


Using Liquid Rubber Waterproofing Membranes

  • After curing, Liquid Rubber provides a membrane that is a tough, highly elastomeric, seamless impervious barrier to moisture. 
  • Liquid Rubber is seamless and incredibly flexible - it will move with your building - the slab and the foundation.
  • It is robust with unprecedented longevity - the new generation of waterproofing.
  • This provides the perfect waterproof membrane for soil, concrete, masonry blocks, prefabricated panels and bricks.

Liquid Rubber membranes are a simple, quick & fast.

Ideal for use in the DIY market for below ground tanking.


OR PHONE: 03 8699 8533

Delivery throughout Australia

Below ground tanking & retaining walls require best practice waterproofing techniques. 

If the following principles are adhered to, there is no reason small retaining wall projects cannot be applied as DIY application.

  • Quality Waterproofing Product.
  • Good Preparation.
  • Correct Waterproofing Application.
  • Robust Membrane Protection.

Commercial & Large Waterproofing Projects 
Below Ground Tanking , Basements & Under Concrete Slab
 should be performed by professional waterproofing companies.

Consequences of below ground membrane failure is costly & difficult to rectify.

Registered Builders & Specialist Melbourne Waterproofers:
Findlay-Evans Waterpooofing


Choosing Best Retaining Wall Waterproofing Products

  • Concrete block, masonry or bricks are porous in nature.
  • Cracks and porosity of the wall materials allow water and moisture to penetrate from adjacent soil to interior walls.


  • Although these two waterproofing products may look very similar, they are VERY DIFFERENT in how they perform.
  • Many contractors continue to use dampproofing because once the foundation is backfilled the area is “out of sight, out of mind”, and once the house is finished and sold it becomes the homeowner’s problem if the foundation starts to leak. 
  • The small amount of money you save by not using proper waterproofing when the home is built, can cost you a lot of money to fix when water appears in your basement after one or two years, or even sooner.

What is Waterproofing?

Waterproofing products are designed to “prevent” water penetration even under wet conditions such as hydrostatic pressure in the soil after heavy rain storms or spring thaws.

Liquid Rubber Membranes

  • Liquid waterproofing membranes have the advantages of quick application, cost effective, excellent flexibility for structural movement and elongation to bridge masonry wall cracks.
  • Liquid Applied Waterproofing products contain rubber which provides superior waterproofing protection and allows the membrane to remain flexible even when it dries.
  • This flexibility allows the waterproofing membrane to stretch as the foundation settles and bridge small hairline settlement cracks that can occur in the concrete or block.
  • Liquid Rubber has robust adhesion to masonry and the membrane will not dry out, crack or peel off the wall.
Waterproofing Retaining Walls Melbourne
  • Ponding or standing water, is water and/or moisture that pools on a surface.
  • There are a number of waterproofing products on the market that cannot withstand ponding water. 
  • These membranes will break down over time and water will leak through into the interior space.

Retaining Wall Waterproofing-Preparation

Prior to membrane application for retaining walls, it is  critical to have good preparation & detailing between the vertical wall interfaces and foundation.

  • With time and along with the normal cyclic thermal contraction and expansion of a building, the cove joint area will move.
  • The retaining wall membrane should be reinforced & detailed to withstand structural movement.
  • It is critical this area is reinforced, using a Geotextile Bandage, which provides extra robust membrane adherence.

View Video below demonstrating how to apply the Geotextile Bandage.

Cement Block Waterproofing-Preparation

  • Attention to preparation is required to treat voids, form-tie holes, and joints. 
  •  At the wall-footing joint, you may be required to use cement or other trowel-grade material to form a "fillet" (radius or cove) before applying the overall coating.
  • Inevitably small holes and cracks are missed with the sealant. It is very difficult to be 100%. 
  • This is where Liquid Applied Waterproofing will bridge divots etc, making these water tight. 

Retaining wall bagged & prepped for waterproofing

retaining wall preparation

Liquid Rubber
DIY Waterproofing Application

  • Liquid Rubber membranes form a seamless, one coat permanent water tight barrier.
  • Applied directly to the retaining wall or foundation, Liquid Rubber forms a seamless, fully adhered rubberized membrane that will not let water in, and being an elastomeric coating will bridge cracks that often form as foundations settle.
  • Waterproofing can be applied in just a few hours- surfaces area size dependent -using a trowel or brush.
  • Liquid Rubber comes in 15L Pails and provides coverage approx 20 sq/m per bucket.
  • Our recommendation is minimum 2 coats - touch dry between the coats.

Retaining Wall Membrane Protection 

Below ground leaks are expensive to rectify and also an extremely challenging job to remedy on the negative side.

  • A very common problem is the failure to provide adequate protection for a newly installed and perfectly good membrane.

ARMA-BLUE Protection Sheet - robust & permanent. 

  • A common cause of retaining wall membrane damaged due to  allowing sharp material (such as gravel) during backfill.
  • Stones  have the potential to puncture a waterproofing membrane. 
  • However with a bit of due diligence and care, this can be prevented by using a robust & permanent protection sheet - ARMA-BLUE


This is a composite medium with cross linked foam to provide strength & durability.

Huge benefits over conventional & cheaper corflute.

  • Will not decay or rot below ground.
  • High abrasion resistance.
  • Also acts as an extra  water barrier.
  • Great for DIY - Easy to cut.
  • Great for DIY - Fast installation.
  • Great for DIY - Easy to handle & Lightweight.

Smaller Projects

DIY Paint On or Roll apply waterproofing


Large Projects

Use Roller Application

Waterproofing Retaining Walls Melbourne

Don't forget to protect your below ground waterproofing membrane!

As professional waterproofers, we use ARMA BLUE adhesive protection sheets.

ARMA BLUE  is ideal for protecting waterproof membranes prior to backfilling and carrying out landscaping.

  • Waterproofing membranes can be seriously damaged after installation.
  • Damage occurs from coarse sharp stones during back filling, landscaping and/or tools from construction trades working over the newly installed waterproofing membrane.
  • ARMA-BLUE is a tough, robust and durable external laminate premium protection system.
  • This composite product uses cross linked foam and has many benefits over conventional Core Flute Board - which is a lot cheaper than ARMA BLUE though in our opinion inferior protection for your waterproof membrane.
waterproofing protection sheet

For large projects contact F.E.W WATERPROOFING

 to spray apply large areas or difficult & challenging construction projects. 

armablue protection sheet

Phone 03 8812 2918 or look at our website here 

Delivery throughout Australia

Buckets :

4L ($120) & 15L ($350)

Don't forget to protect your waterproofing membrane from backfill damage!

We use ARMA-BLUE commercial grade protective board.

It is the best there is !

We don't trust our membranes with any other product.

Purchase ARMA-BLUE by online or

Phone 03 881 22918

Click below to purchase DIY Waterproofing Online

Or Phone 03 8699 8533

Delivery Throughout Australia