Injection waterproofing systems are an effective method for repairing and sealing concrete structures affected by cracks, voids or water ingress. The injection process involves pumping cement-based, polyurethane-based, epoxy-based or acrylate-based materials into damaged areas to securely seal leaks, restore watertightness and extend the service life of the structure. Suitable for use in concrete, masonry and natural stone structures, injection systems can be applied during initial construction or as part of repair and renovation works. Sika injection solutions, including the SikaFuko® injection hose system and Sika Injection® resin products, provide reliable long-term waterproofing for joints, cracks and complex structural details.
Advantages of Sika's Injection Systems
- Forms a permanent watertight seal within cracks, joints and voids
- Suitable for highly stringent waterproofing requirements
- Helps avoid costly structural repairs and reduces operational downtime
- Can be used in concrete, masonry and natural stone structures
- Suitable for use during construction or for later repair and refurbishment
- No additional formwork or reinforcement work required
- Can be used as a standalone waterproofing solution or as a backup system
- Fills the complete joint to prevent water ingress
- Re-injectable systems allow future maintenance if required
- High performance waterproofing for complex and difficult applications
Critical Factors Effecting Injection Works
There are three primary success factors involved in ensuring the effectiveness and durability of injection works. It is essential that the right combination of injection materials, injection equipment and injection method must be selected and this is what Sika’s extensive technical and practical experience provides:
INJECTION MATERIAL
The selection of the right injection material and indeed the right specific injection product for the defined project requirements is the first key factor for success. This especially means the materials viscosity, flexibility and behaviour in contact with water that can all significantly influence the effectiveness of the injection.
INJECTION EQUIPMENT
Appropriate equipment for the selected injection material, including for the correct preparation, mixing and delivery of the material is the second key success factor. This means everything from the initial dosage and mixing, through delivery from a suitable pump, to use of the right packers/ports/connectors.
INJECTION METHOD / APPLICATION
Thirdly, the correct injection method and application techniques must be used by trained, competent and experienced contractors, in order to ensure the success and provide complete and permanent leak sealing solutions.
Injection Solutions for Leaks, Cracks and Damage
Leaking Structures
Water can leak in and out of structures due to cracks, failed joints or permeable substrates. Once identified, if not treated, further issues can arise including the corrosion of reinforcement resulting in significant loss of a usable area within the structure. Sika Injection® resin products are designed to stop water ingress through leaks.
Concrete Damage
There are many ways that damage can occur to concrete, the primary causes include incorrect detailing, inadequate or untimely concrete compaction, or accidents. Sika offers a full range of concrete repair solutions that are compatible with Sika waterproofing systems.
Cracks/Honeycombing
The terms “watertight” and “vapourtight” do not mean “crack-free”. Cracking can always occur in concrete due to stresses imposed on it. Honeycombing describes defects, rough patches or voids in the surface area of concrete that resemble a beehive, it is caused by poor mixing, inadequate compaction and formwork issues. Sika has a range of products for the repair of cracks and honeycombing in concrete structures.
