EnglishWaterproofing
Waterproofing is the process of making a structure or an area of structure water-resistant or impervious to the water seepage.
It helps to maintain the desired level of humidity inside the said structure while protecting everything inside to the adverse effects of water and humidity. In geographies where there are high levels of annual rainfall and/or groundwater levels are higher, waterproofing foundations, basements and roofs becomes a necessity.
Hydrostatic pressure applied by a high water table, can cause water to seep through cracks to cause structural damage as well as other troubles such as mold, mildew.
Waterproofing methods
1-Bituminous Waterproofing
Bitumen is a petroleum product which is highly viscous, sticky and waterproof. There are two main types of bituminous waterproofing methods:
A) Bituminous membranes
B) Bituminous liquid coatings
A) Bituminous Membranes
Bituminous membranes are often hot-applied membranes (meaning they need to be heated by use of blowtorches during their application, there are other types of bituminous membranes which are self-adhesive) that are popular for low-sloped roof applications because of their proven performance through the years.
The self-adhesive ones have low shelf lifes as the adhesive properties of this membrane lose its strength over time.
B) Bituminous Coating
Bituminous coating is a liquid waterproofing membrane. Its elastic properties and water-resistance are often modified by its polymer grade and its reinforcement of fiber. It is applied without the need of heating during its application.
It’s an excellent protective coating and waterproofing agent, especially on surfaces like concrete foundations. It’s easy to install, provides a seamless finish, and has long term durability and wear resistance. Bituminous coating is made from bitumen-based materials, and it usually isn’t suitable for long exposure to direct sunlight unless it’s modified using a more flexible material like polyurethane or acrylic-based polymers.
2- Polyurethane Liquid Membrane
The combination of base (polyol) and reactor (isocyanide) in a specific ratio creates a liquid coating for waterproofing applications.
Polyurethane liquid waterproofing membranes are popular because it is one the most easy to apply waterproofing solutions out there requiring less skill and supervision during its application. It’s application and curing process is fast making it suitable for post-construction applications as well. It is extremely durable; provides a seamless finish, and has long term wear resistance. It is also extremely resistant to UV, adverse weather effects, alkaline cleaners, battery acid and fuels.
3- Cementitious Waterproofing
Cementitious waterproofing products are probably the easiest waterproofing materials to use. They are easy to procure, mix and apply. If you opt out for an acrylic additive to mix in with the cement product one will get a more solid, better bonding, and durable coating.
The chief disadvantage is that cementitious products have less flexibility compared to other types of liquid waterproofing membranes.
4- Acrylic Waterproofing
Acrylic waterproofing membranes are specialist liquids used mainly for roof coating applications. It’s suited for all types of roof applications including flat, domed, and pitched roofs.
It’s application involves the application of a monolithic, fully bonded, liquid-based coating into a roof. The coat cures to form a rubber-like elastomeric waterproof membrane, capable of extending and returning to its original shape without damage. This type of coating applications are usually reinforced with secondary materials like glass-reinforced plastic to increase the tensile strength. This type of waterproofing provides a cost-effective way of making a new or existing roof waterproof.