There is a statistic in the building industry that waterproofing is 1.8% of construction cost but accounts for 83% of building defect complaints.

When you contact Full Spec to undertake your building’s waterproofing in Sydney you can rest assured you will not become a statistic.

Full Spec Waterproofing is one of the leading waterproofing contractors in Sydney. We make use of premium quality materials to waterproof your building or home. We offer both commercial and domestic waterproofing.

We understand that every project we work on is someone’s investment, whether it is a domestic, commercial or civil project.

You name it, we can waterproof it: on time and on budget.

  • Bathrooms
  • Balconies, Terraces
  • Retaining Walls
  • Rooftops
  • Lift Pits
  • Below Ground Tanking
  • Wet Rooms
  • Swimming Pools
  • Concrete
  • Strata & Commercial
  • Sheet & Torch
  • Liquid Membrane
  • Planter Boxes
  • Epoxy Coating
  • Water Stops

Internal Wet Area & Bathroom Waterproofing

Bathrooms and showers are the most used wet areas of any home, so when it comes to bathroom waterproofing in Sydney selecting the correct membrane for your project is crucial.

At Full Spec, we work with several different membranes including hybrid polyurethane and acrylics where more brittle monomeric membranes might fail purchased from DIY stores. We partner the major waterproofing manufactures who are committed to continue developing products to meet the Australian Standards and harsh environment, so that we can offer superior quality services that has to deal with bathroom waterproofing in Sydney.

Quality solutions

If you are looking for a service that has to do with bathroom waterproofing in Sydney, because you are constructing a new bathroom and shower or renovating an existing internal wet area then it becomes imperative to install a membrane that is fit for purpose and applied correctly by a qualified applicator. Supervisors and installers should be aware of how the selected waterproofing system is designed to work in conjunction with AS 3740—2010 Waterproofing of Wet Areas within Residential Buildings. It is also important that the waterproofing membrane installed is compatible with the finished floor system, such as under floor heating, floor and wall tiles and their adhesives. At Full Spec Water proofing, we use this as a standard practice to fulfil your waterproofing needs.

Design – What you need to know prior to waterproofing

  • Shower walls – are to be waterproofed to 150mm above shower floor substrate, or 25mm above maximum retained water level. Shower walls are to be water resistant to 1800mm from finished floor level or 150mm above the fixed shower head.
  • All internal and external corners and horizontal joints are to be waterproofed within the shower area. Plasterboard joints (outside shower) that extend inside shower areas must be waterproof.
  • Unenclosed shower areas are to be waterproofed to 1800mm from shower.
  • Tap-penetrations are to be sealed. Further, tap washers must be accessible without damaging the seal around tap penetrations.
  • Floors and horizontal surfaces adjoining an insert-bath are to be waterproofed.
  • Where the floor is waterproofed, the tanking of the walls is to be a minimum of 25mm above the finished floor level.
  • Bond-breakers must be installed, in cases where the membrane is bonded to the substrate, at all wall-to-floor and hob-to-wall junctions and at movement joints.
  • Hobs must be constructed of masonry, concrete or similar material. Hobs should NOT be constructed of timber. Hobs must be adequately secured to the floor.
  • Water-stop angle to shower area must be finished flush with the top of the finished floor level. This angle forms part of the waterproofing system and must be installed prior to the installation of the waterproofing system.
  • Enclosed and Unenclosed hob-less showers must be fitted with water-stop angles. The vertical leg of the angle must finish a minimum of 5mm above the level of the finished floor.
  • Fixing penetrations must be sealed. Flashing in all wet areas apply to bathrooms and toilets, but do not apply to kitchens
  • Frameless shower screens require a full floor waterproofing system or 1800mm radius from shower rose and, where water stop angles are installed angles must be made visible through tile bed.
  • Water stop must be installed in all wet-areas doorways.


Waterproofing Leaking Balconies

Waterproofing of external wet areas, such as balconies, decks, courtyards and terraces are consistently among the most common reoccurring problematic areas for both domestic housing and commercial apartment blocks. They are considered a category one (major) building defect among home-owner complaints about defective external wet areas; ranking second highest overall and thus, waterproofing leaking balconies in Sydney is the need of the hour. By using the qualified waterproofing technicians from Full Spec for waterproofing leaking balconies in Sydney, you can give your project the best chance of a long term waterproofing solution.

Full Spec Water proofing highly recommends for new external balconies you only use a sheet membrane where possible, especially if it is over a habitable living area. At Full Spec Waterproofing we have repaired or replaced many balconies in Sydney. In our years of experience, we have found there has been a common factor to balcony failure. Regardless of applicator or manufacturer, the common dominator was that a liquid membrane was applied for waterproofing leaking balconies in Sydney. If your water proofer or tiler cannot install sheet membranes, please give us a call and we can supply and install the best product for your external wet area.

The product we use is: 3mm torch on, which is a flexible waterproofing membrane consisting of a mixture of penetration bitumen, modified with Atactic Polypropylene (APP), and reinforced with a layer of non-woven polyester is what we use for waterproofing leaking balconies in Sydney. The underside finishing of the sheet consists of an ultra-thin Polyethylene foil for fast burn and greater adhesion to most sub-straights. The upper surface is finished with a mixture of talcum and sand, this gives a fantastic mechanical finish making it easy to get adhesion for direct sticking tiles or applying a sand and cement screed for creating fall.

Crack Injection

The first question that often arises as to which is better in concrete or block crack repair: epoxy or polyurethane foam. If the crack needs to be structurally repaired and the area needs to be as strong as or stronger than the concrete around it, the answer is simple: epoxy. The answer is less simple if the crack needs only to be repaired to prevent water leaking through it. polyurethane has a far better chance of accomplishing this task as it flexible. If water is flowing from a wall floor junction polyurethane is the only solution.

Epoxies have the advantage of introducing structural integrity, whether needed or not. Polyurethane foams are often more versatile when the crack is actively leaking at the time of repair, or if the area is still subject to limited movement.


Causes for concrete cracks

  • Moisture permeates the tiny breaks in the concrete substrate and in colder climates enlarges them to full-fledged leaking cracks by expansion/contraction resulting from freeze/thaw cycle of the moisture.
  • As the ground around the footing or foundation stabilises, any movement can cause the rigid concrete substrate to separate at these tiny breaks in the concrete, enlarging them to a water-leaking size.

Low and high-pressure injection

The repair of the concrete structures mentioned above is suitably accomplished using low-pressure injection of the damaged areas with a liquid polymer, which hardens with time. Other applications, such as those involving very thick-walled structures (e.g. dam repair) or where a high volume of water flow must first be stopped may be better suited for high-pressure injection.

Low-pressure injection, here defined as 20-40 psi, utilises surface ports placed directly on the surface of an otherwise sealed crack as the entry point of the liquid polymer. This technique can be utilised at up to 250 psi of injection pressure.

High-pressure injection at 250 psi -100 psi utilises injection packers which are typically placed in holes drilled at 45 degrees to intersect the interior of the crack. Until recently, this technique has traditionally been used in in commercial and civil projects, but as the technology is more readily available the use of polyurethane foam repair is preferred. The disadvantages of this approach is the extra cost of packers but it’s worth it in the long run.


The secret to effective crack injection, whether epoxy or polyurethane foam, low-pressure introduction of the liquid polymer into the crack. Low pressure (20-40 psi) allows the applicator to properly monitor the injection process. At this pressure range, the applicator can be confident that the crack has been saturated with the liquid polymer up to that point when liquid begins to collect at adjacent surface injectors.

Polyurethane foams are classified as hydrophilic or hydrophobic. Both a hydrophilic and a hydrophobic react with water (typically that present in the crack, although they can also be mixed with water immediately before injection). A hydrophilic foam system will entrap any excess water present within its structure during foam formation. Both can be formulated to be flexible, but a hydrophilic system is typically more resilient than its hydrophobic counterpart. The disadvantage of a hydrophilic foam is that it can lose any excess water due to evaporation under dry conditions and subsequently shrink (growing again when exposed to more water) Recently, a hydrophobic formulation has been introduced with claims of being as resilient and flexible as a hydrophilic without subsequent susceptibility to shrinkage with time.