Fosroc Supercast SW20, Swellable Waterstop for Construction Joints for Waterproof Concrete Joints

SW20 is designed for concrete substrates such as slabs, walls, pavers, pathways, driveways, balconies and other concrete structures. It provides a reliable barrier against water ingress across civil and industrial settings.

Key benefits include ease of use (no special equipment required), ability to be mixed with standard water supply, trowellable finish, durable resistance to freeze–thaw cycling and chemical attack, high bond strength to substrates, and cost-effective long-term performance with a long shelf life.

Prepare the surface by cleaning to remove dust, laitance, and loose material. Ensure the substrate is sound and free from contaminants. Light dampening is often recommended to improve adhesion before application.

SW20 is mixed with water supplied from a garden hose or similar source until a workable mortar consistency is achieved. It can be applied in high-traffic areas and is trowellable to a smooth finish, suitable for repairing concrete slabs, walls, pavers, pathways, driveways, balconies and other concrete structures.

SW20 expands upon contact with water to fill voids and cracks, forming a continuous watertight barrier as it cures, protecting the substrate from water ingress.

SW20 offers easy handling and application, a durable finish resistant to freeze-thaw cycles and chemical attack, high bond strength to substrates, good long-term impermeability, and a cost-effective solution with a long shelf life.

Typical applications include repairing and waterproofing concrete slabs, walls, pavers, pathways, driveways, balconies, and other concrete structures where a watertight, protective coating is required.

SW20 is described as fast-setting and suitable for use in high-traffic areas. The exact cure time can depend on ambient conditions and thickness, but it is designed to deliver a quick turnaround in typical construction scenarios.

Wear appropriate PPE such as gloves and eye protection when handling, avoid skin and eye contact, wash exposed skin with plenty of water if contact occurs, and follow the product’s safety data sheet for storage and handling recommendations.

SW22 is another cement-based waterproofing coating from Fosroc, offering a similar approach to waterproofing. They differ in specific formulation, setting characteristics, and performance nuances; review both product pages on Fepy to compare their exact specifications and recommended uses.

SW30 is a Fosroc cement-based coating with its own set of performance attributes. Compared with SW20, SW30 may differ in setting time, strength, and impermeability characteristics. For precise differences, consult the SW20 and SW30 product pages on Fepy.