Sika's Overview to Waterproofing Joints

Due to the nature of concrete and reinforced concrete, structures are built divided into sections by forming joints, namely three types – construction joints, movement joints and connection joints. The key function of joint sealing is to minimize water ingress and create a secure waterproofing barrier at these interfaces. The seal must be capable of accommodating the anticipated joint opening and closing due to static reasons or temperature changes. Joint sealing solutions are recommended for use in all kinds of construction and joints for waterproofing.  

 

Joint Sealing Solutions 

1. Hydrophilic Gaskets

The full range of hydrophilic (swellable) SikaSwell profiles, rings, and gun-applied sealants are an efficient solution for construction joints and complementary sealing of penetrations to provide an additional line of protection against water ingress.

Advantages:
  • Highly economical
  • No influence on formwork or reinforcement
  • Can be used as a back-up system
  • Tested and approved system
  • Alternative profiles available for different requirements

 

2. Thermoplastic Waterbars

Waterbars are the most common waterproof joint sealing solution for construction joints and are mandatory for expansion joints. The appropriate profile can be chosen from the wide range of Sika Waterbar based on various materials, depending on project requirements.

 

Advantages:
  • Easy design of closed systems for construction and expansion joints
  • Easy connections by welding
  • Different products, shapes and sizes for diverse requirements
  • Pre-fabricated waterstop systems possible
  • Internal and external waterstops available

 

3. Injection Hose Systems

SikaFuko injection hose system is typically used as a secondary or complementary back-up system to seal construction, movement or connection joints (e.g. diaphragm walls). For details, the appropriate Sika injection material should be chosen.

Advantages:
  • Suitable for highly stringent requirements
  • No influence on formwork or reinforcement
  • Stand alone or backup systems
  • A good injection fills the complete joint and prevents any entry of water
  • Re-injectable systems

 

4. Adhesive Tapes

Sikadur-Combiflex SG System or Sika Dilatec System are post-applied tape systems adhered with epoxy resin onto the membrane, providing an ideal solution for construction and expansion joints, in particular to seal joints of precast components.

Advantages:
  • Approved for use in areas in contact with drinking water
  • Easily adaptable to the construction method
  • Excellent adhesion to different substrates
  • Highly flexible
  • Easily maintained