Waterproofing – everything you need to know

Waterproofing: The Ultimate Guide

This guide will show you everything you need to know about waterproofing.

First, we'll show you exactly why waterproofing is more important than ever.

Then, we'll show you the areas you need to waterproof and all the different waterproofing methods.

Sound good? Let’s dive right in…

Waterproofing is the process of making a structure or an object water resistant in order for it to remain unaffected by water. It is ideal in many different situations where water may prove to be a challenge, e.g. underwater or in wet environments.

Waterproofing can be used on garments, tents, houses, etc. And there are many different methods and materials used depending on the application.  

For many real estate developers and homeowners, waterproofing is seen to be a costly undertaking that is unnecessary, but other than fire, the next worst thing that can happen to your home is water damage. We have all seen many houses flooding as a result of heavy downpour.


Areas that need to be waterproofed

  • Bathrooms
  • Balconies / Decks
  • Retaining Walls
  • Rooftops
  • Planter Boxes
  • Swimming Pools
  • Terrace or Roofs

Benefits to waterproofing your house

Safety: Waterproofing will keep your family and possessions safe during cold and hot seasons. Water is known to rot timber, cause concrete integrity issues, ruin furniture, floor finishes, fixings and cause different kinds of illnesses if mould is present.

Preservation: Waterproofing will keep your house in good condition for a long period of time, regardless of harsh weather conditions. This will also help keep the value of your home.


Waterproofing during construction

During construction, wet areas and areas prone to water exposure must be waterproofed to ensure that the living areas remain unaffected by water and kept dry especially during the rainy seasons. It also reduces humidity in the house, which can damage structural materials, furniture, fixings, floor coverings and even affect health.

Your home is probably your most important asset. It needs to be protected. A waterproofing contractor will use membranes and other types of coatings and materials to protect the interior and exterior of the house giving structural integrity and will protect the house both inside and out.

Waterproofing starts in the early stages of construction, from the foundations right up to the roof top and landscaping.

Waterproofing your house may be expensive, but the benefits far outweigh the cost.

The damage that is caused by water will cost tens of thousands of dollars to repair.

Types of waterproofing:

 

Negative or hydrostatic pressure membranes:

These products can be applied to damp surfaces from the inside of structures. They cannot stop active leaks but can stop rising damp and hydrostatic water pressure. They are commonly used in basements from the internal wall to stop water seepage. Common Negative pressure membranes include, Hydrostatic Epoxies, Cementitious membranes & water reactive polyurethanes.

 

Cementitious membranes:

This is the easiest waterproofing method used in construction, because the materials used in cementitious waterproofing are easily sourced from suppliers, and are easily mixed and applied.
It is used internally in areas that are normally wet. This is because it is a rigid type of waterproofing that is also semi-flexible.

 

Liquid membranes:

A liquid membrane provides a coating which is approximately 1.2mm thick and consists of two top coats and a primer coat that are roller applied. It is more flexible than the cementitious method. The liquid forms a coating which is of rubber-like consistency on the walls & floors that provides an impervious coating. The two main liquid membranes used today are Water Based Acrylic membranes and Solvent Based Polyurethanes.

 

Bituminous membranes:

This is a type of waterproofing method that provides a protective waterproofing coating in accordance with the laid out polymerization and formulation grades.
It is also known as asphalt coating and the most common areas of application are below ground and roof tops. It also provides an excellent protection on concrete foundations. This is because it is made from bitumen materials which become fragile and brittle when exposed to sunlight.

 

Bituminous sheet membranes:

This is a method for low-sloped roofs that is very popular because of its proven performance. It is applied as self-adhesive or torched on with a butane torch.
The self-adhesive comprises of polymers, asphalt, and filler. It may also contain some oils and certain resins that improve the adhesion characteristic. It has a low shelf life because the membranes bonding properties reduce with time.
Torch on membranes have covered and exposed types. The exposed membrane contains an aggregate called mineral granular that withstands wear and tear r. The other types of membranes usually requires an extra layer of protective screed to avoid puncture.

 

TPO (thermoplastic polymer membranes):

This is mainly used on flat areas, such as rooftops as it can withstand extreme exposure to weathering. It can also be used in internal wet areas, balconies and planter boxes. It is very expensive and the costs usually double to triple the price of a liquid membrane system. The system consists of modified polymer sheeting that is heat welded at the seams and has insitu pieces for corners and floor wastes. It requires the most skill of all waterproofing types but is superior in many ways. It is also convenient as it only requires one layer and usually the job can be completed within a day.

 

Cementitious plug:

This helps to seal up any large cracks or active water leakages. It hides any untidy marks, and provides an aesthetically appealing coverage. It can be coated over with any negative pressure membrane.

 

Crack injection:

This is one of the most superior waterproofing solutions. Crack injection is used for active water leaks, usually below ground and is applied by drilling a port into the joint or crack and using a high pressure pump to inject a water reactive polyurethane. The polyurethane reacts and expands into the joint with contact of water and seals the leak instantly

 

Spray applied polyurea membrane:

Spray applied polyurea is one of the newest innovations in waterproofing.It requires little preparation and large areas can be waterproofed in a small amount of time. Spray applied polyurea is very fast setting, easy to apply and extremely flexible and tough. It consists of a high pressure pump fed from a large drum of solution and is applied via a wand, similar to a pressure washer.