In construction projects, the importance of below-grade waterproofing is vital. It protects the building or structure from water damage and structural deterioration caused by moisture penetration. However, selecting, designing and installing the appropriate below-grade waterproofing system is critical, as small mistakes can lead to significant problems and costs down the line.
Careful consideration of site conditions, project design, and the specific waterproofing system and materials is necessary to ensure the longevity and reliability of the system.
With the right approach, below-grade waterproofing systems can provide long-term protection against water intrusion and safeguard the structural integrity of the building or structure.
Systems + Knowhow
Sika waterproofing solutions protect basements and underground structures from water infiltration and damage, making these spaces more comfortable to live in and giving more possibilities for use of the space. Using Sika solutions can lower the overall cost and increase the long-term durability and lifespan of the project.
Our fully integrated and compatible system solutions are sustainably produced and well proven in projects all over the world, where they have been lasting for decades. Sika waterproofing systems are fully tested and certified to national and international standards. This gives peace of mind to project owners, specifiers and contractors, knowing that the solutions will meet performance criteria for specific requirements.
1. Fully Bonded Sheet Membranes
Fully bonded and highly flexible TPO sheet waterproofing membrane systems can permanently prevent any lateral water migration between the waterproofing membrane and the structural concrete in the event of local damage, even when this has occurred below the base slab. Sika fully bonded sheet waterproofing membrane systems are simple and easy to use, making them fast and secure to install on site. The overlaps, butt joints and details are all connected and sealed very simply by bonding them together with sealing tapes or by welding. There are no complicated welding procedures, and no special equipment is required.
2. Wet-bonded Sheet Membranes
Wet-bonded sheet waterproofing membranes consist of a cross-laminated HDPE carrier film laminated with a modified bitumen based adhesive on one or both sides. The system can be installed single or double-layered and does not require any accessories such as tapes and adhesives. The system is complemented with a fully bonded, synthetic membrane below the base slab.
3. Waterproofing Mortars and Bituminous Coatings
Sika waterproof mortars and bitumen-based coatings are rigid or semi-flexible waterproofing products. They are supplied as ready to use solutions for basements to be sealed against damp soil, seepage and percolating water. They are generally post-applied externally on walls and must be used in combination with appropriate joint sealing solutions for connection, construction and movement joints. External drainage with a permanent dewatering system is also recommended, such as drainage boards.
4. Watertight Concrete System
The Sika Watertight Concrete System offers a comprehensive solution for watertight structures. The system consists of concrete that has been specially modified with Sika admixtures to produce waterproof concrete and carefully selected waterstops for construction and movement joints. Watertight concrete structures can be designed to keep water in or out, or both. External drainage with a permanent dewatering system is also recommended, such as drainage boards.
Sika® WT-200 P TH
SikaControl®-500 WT
