Cement Block Retaining Walls

May 22, 2017

Waterproofing Membranes for

Cement Block Retaining Walls

Using Liquid Applied Membranes to Waterproof Retaining Walls

Inadequate waterproofing is often the cause of catastrophic & expensive leaking basements.

Reduce the risk of leaking retaining walls & basements by waterproofing correctly.

Findlay-Evans Waterproofing Video Case Study - Below Ground Tanking Melbourne. 

Ignorance of Best Practice to Waterproof Retaining Walls

  • Using low-cost waterproof membrane that is not guaranteed by the manufacturer.
  • Not worrying about the standard of work or number of waterproof coats applied. 
  • Skimping on drainage behind the wall.

Remedial Waterproofing & Repairs

Why Take The Risk ?

  • Basements with inadequate waterproofing are an expensive exercise to repair.
  • Consider the cost involved: excavate behind wall(s); install new membrane and drainage; backfill;make good gardens,footpaths, driveways etc; pay for damage to owners belongings.

Effective Waterproofing Membrane for Basements & Below Ground - - Liquid Rubber Membrane Spray Applied Waterproofing to Retaining Walls

Liquid Applied Membranes are our method of choice to waterproof retaining walls and all below ground tanking.

Cement blocks are very porous and it is imperative the surfaces are waterproofing correctly. 

  • The inherent porosity of block work often causes mortar to break down, allowing water moisture to penetrate leading to structural damage.
  • Obviously correct waterproofing installation is critical for all structures using cement block work.
Concrete blocks are used to construct a large variety of above & below ground structures.
  • Foundations
  • Retaining Walls
  • Basement Walls
  • Planter Boxes

Liquid Applied Waterproofing to Basement Walls

Best Basement Waterproofing Product:

Liquid Applied Membranes 

  • Rapid Spray Application & Fast Curing
  • Spray applied down to footings & waterproof "cove join". 
  • Membrane that is tough, resilient & highly flexible.
  • No heat, flames, fumes or adhesives - safe for all trades on-site.
  • Seamless membrane to retaining wall - no joins or seams.
  • Low Permeability.

How to Prepare Retaining Walls for Waterproofing 

  • The perfect waterproof preparation to ensure membrane adhesion for retaining walls is a rendered / bagged surface.
  • Our Team, Findlay & Evans, apply rendering to all cement block walls prior to application.
  • We also prepare the footing and foundation joins with flexible Geotextile Bandage to bridge all surfaces.
  • Also as part of our waterproofing method for retaining walls, we fill all wall voids, form-tie holds and joints. 

Cement block retaining wall preparation prior to waterproofing application

Below Ground-Waterproofing-Melbourne

Protecting Waterproofing & Retaining Walls

How To Waterproof Retaining Walls?

For smaller projects or for the Owner/Builder, Liquid Rubber Membranes can be applied by brush or roller from handy DIY Buckets.


Together with Arma-Blue protection sheets, waterproofing small retaining walls is easily achieved by the DIY market. 

For further information - see link below. 

DIY Waterproofing for Retaining Walls - SEE HERE


For larger below ground waterproofing projects use an experienced & certified waterproofing company - Findlay-Evans Waterproofing