Waterproofing Rooftop Plant Decks

A Guide to Liquid Applied Membranes for Efficient Roof Protection

There are challenges unique to flat roof surfaces that contribute to accelerated deterioration of the waterproofing system.

  • Unfortunately flat roofs can be inefficient in their ability to shed water - constant "ponding" water can present problems to membranes unsuitable for holding water. 
  • Flat roofs also harbour more dirt & debris at joints, details and around penetrations such as service ducts and pipes. 
  • All aspects of flat roof surfaces are constantly exposed to the full effects of external weathering.

Case Study: Severe cracks on existing roof membrane

Liquid Applied Waterproofing Membranes 

Liquid waterproofing systems solve many of the challenges involved with flat roof projects.

  • These membranes can withstand ponding water.
  • Being liquid, they have the capacity to mould to the shape of the structure and around roof services.
  • UV stable and will not degrade in sunlight and importantly - unlike the older generation of roofing products - there are no naked flames on-site.
  • Cold spray-applied membranes provide fast application resulting in a robust barrier protecting against the effects of water, pollution, salt and chemicals.

Spray Applied Liquid Waterproofing

Elastomeric Roof Waterproofing Membranes

  • These new generation and state-of-the-art waterproofing membranes are a great alternative to the conventional bitumen roofing, EPDM, sheet and roll-on waterproofing products that have always exhibited many problems.
  • Elastomeric membranes create a uniform, monolithic and seamless waterproofing barrier.
  • The extreme flexibility of Liquid Applied Membranes (LAMs) allow for general building movement – the normal contraction and expansion of a roof structure - without the risk of membrane cracking.
  • Unlike adhesive or heat (flame) applied sheet membranes with joins, the fully bonded and seamless Liquid Rubber membrane prevents tracking and ingress of water underneath.

Case Study - View Video Below

  • Liquid Rubber membranes were developed to address the recurring problems encountered by conventional membrane systems.
  • These products are state of the art and mindful of today's environmental concerns and OH&S safe working practices.
  • Liquid Rubber it is cold applied, instant set and solvent free.
  • Liquid Rubber is a totally slump free system and suitable for both horizontal or vertical surfaces.

Case Study - View Video Below

The traditional systems have disadvantages:

  • Seams & Joins: areas of weakness and major cause of water tracking.
  • Flames & Heat: conventional membranes (Torch On) can damage pipes, wiring & infrastructure due to heat applied during waterproof application.  
  • Associated Fumes & VOCs: many conventional membranes i.e urethanes, vinyl and epoxy based coatings are high in VOCs (Volatile Organic Chemicals).
  • Cracking: conventional membranes harden over time developing cracks causing membrane failure.
  • Lack Adhesion: many conventional membranes are not fully bonded to the roof surface.

Leaking roof due to water pooling & tracking under sheet membrane.

Findlay-Evans WATERPROOFING - Expert Applicators of Liquid Rubber Membranes

After years of experience within the waterproofing industry, F.E.W Waterproofing have become advocates of the unique properties of Liquid Rubber.

  • Seamless: Liquid Rubber is spray applied producing a SEAMLESS membrane with superior adhesion.
  • Flexibility: Liquid Rubber has an elasticity of 800%(not age affected) and 95% memory.
  • Time: Fast spray application with rapid instant set curing – enables shorter windows of opportunity to carry out application.
  • Cold Spray Applied: Liquid Rubber does not require heat, flames or adhesives.
  • Eco-Friendly: Meets all OH&S concerns, non-hazardous, non-toxic& non-flammable.

Commercial Roof Melbourne - Case Study

  • The F.E.W Waterproofing team take great care inspecting all surfaces; these must be thoroughly clean prior to installing the waterproofing membrane.
  • A smooth, monolithic concrete surface is required for proper membrane adhesion - so all surfaces must be free of voids, spalled areas, loose aggregates, and sharp protrusions and with no coarse aggregate visible.
  • To ensure correct surface preparation we use high pressure washing, broom, vacuum cleaner and/or blown/compressed air to remove dust, loose stones, and debris.
  • After careful preparation, the concrete must be cured and dry before waterproof application can begin.
  • This surface was very porous so we applied a special environmentally friendly primer to reduce out gassing.

Spray applied Liquid Rubber over existing torch-on sheet membrane.

Liquid Rubber Membranes are the ultimate  roof waterproofing system.

Using Liquid Waterproofing Membranes

Flat Concrete Roof

Melbourne Liquid Waterproofing

More Articles Below