Forspec PREBAR PVC Internal Waterstop for waterproofing concrete construction joints in basements, retaining walls, tunnels, water tanks, and other cast-in-place concrete structures.
PREBAR PVC Waterstop Internal
PREBAR PVC Waterstop Internal
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PREBAR PVC Waterstop Internal

Sale price$242.00
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PREBAR PVC Waterstop is a high-performance thermoplastic PVC profile designed for watertight sealing in cast-in-situ concrete joints. It is compliant with BS 2782 and suits both construction and expansion joints in horizontal and vertical applications. Heat-weldable for seamless on-site joining, it comes in various profiles with prefabricated intersections to simplify installation. Durable and resistant to water, chemicals, and environmental factors, it ensures long-lasting waterproofing in critical structures.

Size: 150mm X 15m
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Pickup available at The Waterproofing Shop

Usually ready in 24 hours

Forspec PREBAR PVC Internal Waterstop for waterproofing concrete construction joints in basements, retaining walls, tunnels, water tanks, and other cast-in-place concrete structures.

PREBAR PVC Waterstop Internal

150mm X 15m

The Waterproofing Shop

Pickup available, usually ready in 24 hours

22/872 Canterbury Road
Roselands NSW 2196
Australia

+61280213517
PREBAR PVC Waterstop Internal150mm X 15m
$242.00
Add it to your kit

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System Build-Up Guide

Correct application makes all the difference.

View All Details

Pool System Build-Up

  • 1 Concrete Substrate
  • 2 Crack Repair (if required)
  • 3 ACTFLEX FLEXPLUS
  • 4 ACTFLEX HYDROPLUG
  • 5 ACTFLEX AT MESH
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  • 8 Pool Finish
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  • 2 Crack Repair (if required)
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  • 4 ACTFLEX AT MESH
  • 5 ACTFLEX 988 CWP (2 Coats)
  • 6 Protection Board (Optional)
  • 7 Drainage System
  • 8 Backfill
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Tank System Build-Up

  • 1 Concrete Substrate
  • 2 Crack Repair (if required)
  • 3 ACTFLEX FLEXPLUS
  • 4 ACTFLEX AT MESH
  • 5 ACTFLEX 988 WMP (2 Coats)
  • 6 Protective Coating (Optional)
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How to install

Watch the install

Step-by-step from prep to top coat. Filmed on the tools, not in a studio.

Watch the install poster

Why Choose

The Waterproofing Shop?

We supply premium waterproofing products backed by expert advice, fast service and real-world experience.

100% Australian Owned & Operated 100% Australian
Owned & Operated
30+ Years in the Waterproofing Industry 30+ Years in the
Waterproofing Industry
Thousands of Products in Stock Thousands of Products
in Stock
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Australia Wide
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Support

Frequently asked questions

View all FAQs
  • What is PREBAR Internal Waterstop used for?
    Compatibility

    PREBAR Internal is a cast-in-situ PVC waterstop for watertight sealing in concrete construction and expansion joints - used in water-retaining structures (tanks, pools, basements) and water-excluding structures (below-grade walls, foundations).

  • How does an internal waterstop work?
    Performance

    The waterstop is positioned centrally in the concrete joint before the pour. Once concrete cures around it, the waterstop creates a continuous flexible barrier through the joint - water can't migrate from one side to the other.

  • How is it installed?
    Installation

    Position the waterstop centrally in the joint formwork before concrete is poured, ensuring half the width is embedded each side of the joint. Heat-weld waterstop splices for a continuous barrier. Pour and finish concrete normally.

  • Specifications?
    Compatibility

    250mm wide by 12.5m roll (also available 150mm x 15m). Recommended 10mm thickness. Blue thermoplastic PVC with Shore A 75 hardness. 330% elongation at break. Service temperature -20°C to +50°C. Complies with BS 2782.

  • Heat-weldable joints?
    Performance

    Yes. PREBAR splices are heat-welded with a thermo-fusion tool to create continuous waterstop runs around corners and at intersections. The welded joints achieve the same waterproof barrier as the parent material.

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