An Overview of the Kinds of Waterstops for Concrete Joints

by MWB News | Saturday, Jun 2, 2018 | 346 views

Water dropConcrete is among the most widely used materials for construction nowadays. The material is however prone to cracks which provide a passage for water. The moisture accumulation will over time lead to fungal and mold growth which ultimately affects your structure’s integrity.

Getting a waterstop for concrete joints will help protect your concrete from water damage. A waterstop is a segment of flexible waterproofing material which keeps water out of your concrete joints. Here are some of the waterstop options you can select.

PVC Waterstops

These waterproof concrete joints by entrenching on all sides thus creating a physical water barrier. They come in various sizes, thicknesses, and widths to fit all constructions.

The primary advantages of PVC waterstops are that you can install them in all weather conditions and their durability. It, however, takes time and skill to fix PVC waterstops correctly.

Bentonite Waterstops

This hydrophilic system is a clay compound which expands on contact with water to approximately sixteen times its size. The expansion results in the formation of a compression seal which closes concrete voids and cracks.

Bentonite is poured immediately after application of concrete for optimal performance. It should also be dry before setting since any moisture weakens and damages your concrete joints.

Urethane Waterstops

This is also a hydrophilic system which swells to approximately 350% of its original capacity. Compared with bentonite, urethane is quicker to install. One can apply it with a caulking gun or in strips.

Unlike bentonite, concrete is poured about 24 hours after application of dry urethane. Both bentonite and urethane are not suited for extreme weather conditions since they do not stand up well to excess moisture.

The waterstops all mentioned here offer optimal moisture protection for your concrete structure. The ideal solution for your concrete primarily depends on the climate of your area. The hydrostatic pressures, chemicals and joint types in your structure will also determine this.

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