The Best Waterproofing Materials

6 August 2018
 Categories: Construction & Contractors, Blog

Water in the wrong places will cause dampness and mold growth, damage your walls and ceiling, and threaten the very foundation of your building. You want to do everything to waterproof your home. Choosing the right waterproofing materials is key to ensuring a successful job.

Here are some waterproofing materials for different sections of your home.

Interior Walls

Silicate-based concrete sealer is used on unpainted walls. It penetrates the surface of the wall and reacts with the elements in the concrete to form a hard waterproof surface that will not peel off or flake.

Concrete waterproofing is a concrete-like mixture that is applied directly on wall surfaces. You can also use plaster additives when doing your plastering to make the wall more waterproof.

Finally, you can apply waterproofing paint. You'll need to apply several coats for a better effect. Choose a variety that breathes to let out moisture.


A mandatory step in waterproofing the foundation is to lay a waterproof membrane while laying the slab. An asphalt coating can also be applied on the surface of the foundation. Asphalt coating is best when mixed with polyurethane and/or acrylic polymers.

Alternatively, you can spray a liquid sealant for greater flexibility. This performs better against expansion and contraction of the foundation.


Sheet Membrane

Flat roofs are especially vulnerable to leaks. One popular material for waterproofing roofs is the sheet membrane. These sheets are used to waterproof concrete surfaces. They are made of a combination of polymer and asphalt on a polythene sheet.

They are self-adhering, making them non-toxic compared to applying asphalt only. They are, however, tricky to install, especially at the seams and edges.

Liquid-Applied Membranes

These are also applied to the exterior side of concrete using a spray or trowel. The thickness has to be just right and the application uniform. They also have to be applied on a clean and dry surface. Liquid-applied membranes are best for uneven surfaces.

Examples of liquid-applied membranes include urethane, silicone, polyurethane, and PMMA. Polyurethane membrane is sensitive to moisture. If the moisture content is high, the membrane will not bond properly with the surface and may peel off after some time.


Liquid rubber coating is best for basement waterproofing, especially in areas that are prone to flooding.

Waterproofing materials come in different forms, including sheet membranes, liquid membranes, concrete additives, and paints. The type you choose will depend on the part of the building you wish to waterproof and the properties of the surface; whether rough or smooth, interior or exterior, dry or moist, flat or irregular.