Expansion and construction joints (Swellbar & PVC waterstop)

Common issues and queries you can face

Expansion joints and construction joints

PVC weberdry waterstops are recommended to stop leakage positively through construction and expansion joints in concrete structures. They are required whenever concreting is to be made in 2 phases (between slab and slab or slab and wall or wall and wall). They are installed within the reinforcing steel before concreting. During concreting, one part is immersed in concrete while the other is kept free until the second phase of concreting takes place. They are made of flexible PVC and are available in different sizes and types.

Swellable water stops are recommended for construction joints. They are present in two types :

weberdry swellbar is a mix of bentonite and butyl rubber and weberdy swellbar RB is a swellable water stop in pure rubber. They have the ability to expand in presence of water. The expansion process is slow in time. It starts after 4hours.

They are present in different sizes and types depending on the degree of protection and for use in both fresh and sea water (SQ type)

Step by step solution

weber solution

  1. Substrate preparation

    Uneven wet surfaces should be even, and hardened rough surfaces should be smoothened with the appropriate grinding machine, to install the swellable water stops.

  2. Product solution

    PVC waterstops are installed within the reinforcing steel before concreting. During concreting, one part is immersed in concrete while the other is kept free until the second phase of concreting takes place. Use steel nails for fixing, a 25 to 30 cm interval is necessary between nails. PVC Waterstops are tied to the reinforcement steel bars with steel wires through the holes in the perforations in the waterstop. Regarding the swellable waterstop, overlap joints in the strips should be made at least 75 mm. Butt-joined is also acceptable but has to be carefully stuck down with mastic.