A waterproofing of wetlands is a very important stage for civil construction projects. After all, it is a current requirement of Brazilian technical standards, such as the NBRs 15.575, 9574 and 9575.
To avoid problems during audits and obtain maximum customer satisfaction, it is essential to do a waterproofing project that identifies all the wet and wettable areas of a building. From this, with quality products and services, your company achieves efficient waterproofing.
Are you interested? In this post, we will explain the differences between wet and wet areas, how waterproofing is done and what are the requirements for the procedure. Follow up!
Blok ST
Waterproofing Resin for Structured Flexible Polymer Mortar
What's the difference between wet, wettable, and dry areas?
Brazilian regulations distinguish between three types of surfaces regarding the risk of moisture accumulation: wet, wet, and dry areas.
Wetlands
Also known as Wet, are those that allow the formation of water slides on its surface. This increases the ability of moisture to penetrate structures and cause damage.
Consequently, a higher-performance and specialized waterproofing system is required. In the projects, the most common wet areas are the bathroom, the service areas, the slabs and other discovered structures, as well as places where, for cleaning, it is necessary to keep a water slide for an extended time.
Although they do not receive enough moisture to form water sheets, wettable areas have a greater exposure to splashes and drops. Therefore, they may have intermediate strength waterproofing. This is the case of rooms with sinks, kitchens and covered balconies. In addition, they also cover surfaces that come into direct contact with water for a short time.
Dry Areas
Finally, it is also important to distinguish between dry areas. These are those regions that, in daily use, do not come into direct contact with water even during cleaning actions.
According to NBR 15,575, dry and wettable areas do not have to be watertight, that is, to prevent the penetration of liquids. The wet ones, on the other hand, need to be waterproofed to ensure maximum tightness.
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What are the requirements for waterproofing wet and wettable areas?
According to the NBR criteria, watertightness is defined as the ability to prevent moisture from appearing in protected structures when the surface is subjected to at least 10 millimeters of water for 72 hours.
After 24 hours of removing the liquid, the region may not present any moisture-related pathologies, such as:
However, changing the shade with the naked eye is allowed. However, this characteristic must be reported by the manufacturer of the waterproofing agent to the customer through the product's Technical Data Sheet.
Wettable areas, on the other hand, although they do not require watertightness, must be resistant to humidity. In other words, the properties and characteristics of the structure cannot be changed due to direct contact with water.
How is wetland waterproofing done?
Briefly, waterproofing can be done following two principles: the rigid and the flexible. In the first case, the structures where the waterproofing will be applied are not subject to thermal expansion or continuous mechanical stress from vibrations. An example is interior surfaces without direct contact with the Sun or hot water.
In the second case, the surfaces are subject to constant volume changes due to the change in temperature or the action of mechanical forces, presenting a greater risk of cracking. In this case, flexible waterproofing with elasticity and high forming capacity is required.
Thus, the waterproofing depends on the wet area where it will be applied. In the bathrooms and in the internal service areas, it is possible to use the rigid or semi-flexible waterproofing agents, such as waterproof mortars. On the other hand, in outdoor leisure areas and slabs, it is safest to use flexible waterproofing agents, such as flexible polymer mortars.
Therefore, to guarantee the successful waterproofing of wet areas, your company must classify all surfaces according to exposure to water in order to then use the correct waterproofing agent for the structure and that allows watertightness adequate. For this, a supplier of high-quality products is essential.
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