What are the Different Types of Waterproofing?

What are the different types of waterproofing? Text against background of bitumen membrane waterproofing with blowtorch

The Types of Waterproofing

Crack Injection

Cracks in the walls are injected with polyurethane resins using specialist equipment. The resin reacts with the water inside the crack to permanently seal the gap up.

It’s not just walls that get cracked; oftentimes we find ourselves repairing leaking joints or floors using the crack injection system. Our resin injection engineers are highly trained in this form of waterproofing. 

Cementitious Membranes

These include cement-based membrane surface coatings and waterproof slurry. They are relatively easy to mix and apply, so are a popular choice. However, they are not suitable for waterproofing areas which expect movement as they have little no to elasticity.

​It’s always best to hire a professional waterproofing contractor that the right method is used for your project. 

Liquid Membranes

Liquid membranes can be rolled on with a roller or brush, like paint. They can also be applied using a spray or trowel. 

These elastomeric resins cure to form a continuous layer, adhered to the surface below. As well as being waterproof, they can also be gas-proof, protecting from harmful substances like methane and carbon dioxide. 

Spray Applied Polyurea Membrane

This spray-applied system can be used for a range of surface applications such as roofs, decks, and basements. The flexibility and long-lasting properties of spray-applied polyurea mean that it can also be used to protect areas like ship and barge hulls, as well as military vehicles and aircraft.

Application on both horizontal, vertical, and oddly shaped surfaces is also made easier by the use of the spray equipment. Another major advantage is its ultra-fast curing properties, meaning that foot traffic can pass after just a few minutes, giving the shortest down-time for in-use facilities. 

Bituminous Membranes

Bitumen, also commonly known as asphalt, is a form of petroleum. Characteristically black and notoriously sticky, it can be tricky to work with for the inexperienced waterproofer. It comes in rolls which are unfolded and laid onsite using tar-based adhesives and blowtorches. APP and SBS are bitumen, composed of plastomer and elastomer, respectively.

It is strong, and chemic and UV resistant, so is typically used as a roof waterproofing system. Downsides of working with this material include its combustibility, reduced lifespan in extreme weather conditions, and the fact that it is not regarded as a sustainable building material due to being produced from crude oil. This is a factor of increasing importance in the modern day. 

Negative Pressure Membranes

Negative side waterproofing means the material is applied to the inside face of the subsurface, halting water from entering the space below or inside (as opposed to positive waterproofing where the waterproofing material is applied externally).

A good example of this is waterproofing from inside the basement to stop leaks coming through the walls from outside. So, the materials used in this case must be able to withstand hydrostatic pressure.

​This method of waterproofing holds the advantage of being accessible after installation although it is limited to application of cementitious systems and provides no protection from freeze-thaw cycles. 

TPO or Thermoplastic Polymer Membranes

TPO is acronymous for Thermoplastic Polyolefin and is a type of membrane developed in the 80s. It is highly energy efficient and environmentally friendly since it doesn’t contain toxic ingredients. Traditionally, it’s primary use is on flat roofs although it can be used on underground structures and water tanks.

This material has gained praise across the industry due to its numerous installation and performance benefits and is one of the fastest froing commercial roofing products. 

Cementitious Plug

​Designed to stop water and moisture ingress by plugging leaks and seepage, this is a durable option which can stop live water flow when applied to substrates like concrete, masonry, earthenware, and stone. 


Choosing an Effective Waterproofing System

​The most appropriate method of waterproofing will depend on a variety of factors which can be assessed by a waterproofing expert upon their inspection of your property.

To book your appointment with a waterproofing professional, please use the contact form on our website or click here to call us. 

What are the Different Types of Waterproofing?