Some detailed info on waterproofing system options liquid-applied membranes
These systems are applied as a fluid, creating a monolithic (seamless) and highly flexible membrane that conforms to the shape of the surface.
- Polyurethane (PU): Known for their exceptional elasticity and durability, polyurethane systems are used on roofs, balconies, and podium decks.
- Acrylic: A water-based, flexible, and UV-resistant option often used for external walls, terraces, and roofs.
- Cementitious: A mix of cement, sand, and chemical additives. It forms a rigid or semi-rigid waterproof layer over concrete and masonry in wet areas like water tanks, bathrooms, and foundations.
- Bituminous coatings: Asphalt-based and modified with polymers, these offer a flexible protective coating for concrete foundations and below-grade applications.
Sheet-applied membranes
Sheet membranes are pre-formed rolls that are unrolled and adhered to a surface.
- Polymer-modified bitumen: Composed of asphalt, polymers, and stabilizers, these sheets are durable and often used on roofs and for below-grade applications. They can be self-adhering or torch applied.
- Thermoplastic (TPO/PVC: These are flexible, reinforced sheets often used for low-slope commercial roofs. Their seams are heat-welded for a tight seal.
- EPDM: A durable synthetic rubber membrane used for various above-grade and below-grade applications, including roofs and foundations.
- Self-adhered membranes: These rolls have a sticky adhesive backing for easy application on both below-grade and some roofing projects.
Crystalline waterproofing
This system works from the inside out by using chemicals to create insoluble crystals within the concrete itself, plugging its pores and capillaries.
Integral application: A powdered additive is mixed directly into the concrete during construction, waterproofing the entire structure from within.
Topical application: Applied as a slurry coat to existing concrete. When moisture is present, it penetrates the concrete to form crystals.
Self-healing capability: The crystals reactivate in the presence of water to fill hairline cracks that form over time, providing permanent protection.
Other commercial systems
- Elastomeric coatings: These highly flexible coatings can stretch significantly, making them ideal for sealing roofs with many protrusions or extreme temperature variations.
- Green roofing technologies: These systems incorporate vegetation over a waterproof membrane. The waterproof layer protects the roof, while the vegetation insulates and manages stormwater.
- Bentonite systems: Waterproofing involves sodium bentonite, a natural clay that swells when it comes into contact with water, creating a tight seal. These can be used in mats or panels for below grade foundations.
