PVC Water Stop for Concrete Construction Joints
Flexible PVC joint-sealing profiles designed to help control water movement through construction, expansion and movement joints.
Centre-bulb and ribbed profiles.
Suitable for water-retaining and underground structures.
Project-specific sizes and technical support.
Applications
Water Tanks
Reliable Joint Waterproofing for Concrete Structures
PVC Waterstop is embedded across concrete joints to help restrict the movement of water through construction, expansion and movement joints.
Designed for civil engineering and waterproofing applications, PVC Waterstop helps create a continuous barrier within concrete structures when correctly selected, positioned and installed.
Key benefits
Creates a continuous barrier across the concrete joint.
Helps control water movement through construction and movement joints.
Available in centre-bulb, ribbed and other project-specific profiles.
Suitable for water-retaining and underground concrete structures.
Can be supplied in different widths, thicknesses and roll lengths.
Wastewater Treatement Plants
Dams and Reservoirs
Basements and Foundations
Tunnels and Culverts
Canals and Hydraulic Structures
PVC Waterstop helps control water movement through construction, expansion and movement joints in concrete structures. Its flexible, ribbed profile is designed to become embedded in concrete and create a continuous barrier across the joint.
Important Precautions
Maintain the correct alignment and embedment depth throughout installation.
Do not sharply bend, cut, puncture, or deform the waterstop.
Ensure that reinforcement and formwork do not interfere with the waterstop profile.
Do not allow concrete to remain poorly compacted around the waterstop.
All welded joints should be properly aligned, fused, cooled, and inspected before concrete placement.
Follow the project drawings, approved method statement, and manufacturer’s technical recommendations for profile-specific requirements.
Note: Installation details may vary depending on whether the product is an internal, external, centre-bulb, kicker, or special-profile PVC waterstop. Always verify the fixing method and joint arrangement against the approved construction drawings.
Key Benefits
Installation Guidance
Correct installation is essential for the performance of a PVC Waterstop system. The profile should be selected according to the joint type, positioned accurately, secured before concrete placement and fully surrounded by properly consolidated concrete.
Step 1: Inspect and prepare the waterstop
Check the PVC waterstop for cuts, cracks, deformation, or other damage. Uncoil it before installation so that it can return to its proper shape. Clean the waterstop and remove any dust, oil, or foreign materials.
Step 2: Position the waterstop correctly
Place the waterstop along the centreline of the joint. For a centrally positioned waterstop, approximately half of its width should be embedded in the first concrete pour, while the remaining half should extend into the adjoining pour.
Step 4: Use suitable formwork
For vertical construction joints, split formwork can be used to hold the waterstop firmly in position while allowing part of the profile to remain exposed for the next concrete pour.
Step 3: Secure the waterstop
Fix the waterstop to the surrounding reinforcement using tie wire, factory-provided eyelets, punched holes, clips, or suitable support bars. Fasten it at regular intervals to prevent movement, twisting, or displacement during concrete placement. Do not drive nails or screws through the functional body of the waterstop.
Step 5: Join waterstop sections
Cut the ends square and clean before joining. PVC waterstop sections should generally be joined by heat welding using a suitable thermostatically controlled welding iron. Align the heated ends carefully, press them together evenly, and allow the joint to cool completely before installation. Factory-made corners, tees, crosses, and other transitions are recommended where available.
Step 6: Place and compact the concrete
Pour the concrete carefully to avoid displacing or damaging the waterstop. Thoroughly vibrate and consolidate the concrete around the profile, ribs, and flanges to prevent voids, honeycombing, and air pockets. Avoid striking the waterstop directly with the vibrator.
Step 7: Prepare for the second pour
After the first pour has cured, remove the formwork and inspect the exposed portion of the waterstop. Clean away concrete residue, dirt, and debris before placing the adjoining concrete pour.
Frequently asked questions
Q1.What is a PVC waterstop?
A PVC waterstop is a flexible, ribbed sealing strip installed within concrete joints to prevent water from passing through construction, expansion, contraction, and movement joints. Its ribs create a mechanical bond with the surrounding concrete, while its flexible body helps accommodate limited joint movement.
PVC waterstops are commonly used in basements, water tanks, swimming pools, dams, reservoirs, sewage-treatment plants, tunnels, foundations, retaining walls, and other water-retaining or below-ground structures.
Q2. How are PVC waterstop joints connected?
PVC waterstop sections, corners, tees, crosses, and other intersections are normally connected by heat welding with an approved thermostatically controlled welding iron. The ends are cut square, cleaned, heated evenly, aligned, and pressed together while the PVC is molten
After cooling, the welded joint should be inspected for:
Correct alignment.
Complete fusion.
Continuous weld formation.
Pinholes or gaps.
Excessive burning or discolouration.
Cracks or weak areas.
Adhesives, solvent cement, overlapping, or tying the ends together should not replace a properly heat-welded connection. Defective welds should be removed and rewelded before concreting.
Q3.Where should a PVC waterstop be installed?
A PVC waterstop should be installed directly along the designed concrete joint before concrete placement. For a centrally positioned waterstop, approximately half of the profile is embedded in the first concrete pour and the remaining half is embedded in the adjoining pour.
The exact profile depends on the joint type:
Centre-bulb waterstop: Used where expansion or movement is expected.
Construction-joint waterstop: Used at planned concrete pour breaks.
External waterstop: Installed on the outside face of the concrete structure.
Internal waterstop: Positioned within the concrete section.
Kicker or corner waterstop: Used at wall-to-slab and other changes in direction.
The selected profile should always match the project drawings and expected joint movement.
Q4. How can concrete defects around a PVC waterstop be prevented?
Concrete must be placed carefully and compacted thoroughly around the waterstop, including around its ribs, flanges, and centre bulb. Poor consolidation can leave air pockets, honeycombing, or voids, allowing water to bypass the waterstop even when the profile itself is correctly installed.
To prevent defects:
Keep the waterstop straight and correctly aligned.
Avoid dropping concrete directly onto the profile.
Maintain sufficient space between the waterstop and reinforcement.
Use a concrete vibrator carefully near the waterstop.
Do not strike or displace the profile with the vibrator.
Check corners and congested reinforcement areas carefully.
Clean the exposed waterstop before the second concrete pour.
Q5.How is a PVC waterstop fixed in position?
The waterstop is secured to reinforcement or formwork using factory-provided eyelets, pre-punched holes, clips, hog rings, or tie wire. It must be fixed firmly enough to prevent displacement, folding, twisting, or floating during concrete placement.
Fixings should be made through the designated outer flanges or fixing points. Nails, screws, and tie wire should not be passed through the main sealing body because puncturing the active section may create a leakage path. Adequate clearance must also be maintained between the waterstop and reinforcement so that concrete can flow and compact properly around the profile.
Q6. How long does a PVC waterstop last?
The service life of a PVC waterstop depends on the quality of the PVC compound, exposure conditions, joint movement, chemical environment, installation quality, and the performance of the surrounding concrete. High-quality flexible PVC waterstops can provide several decades of service when correctly selected and installed. Some technical sources report long-term performance exceeding 50 years in suitable buried applications.
PVC waterstop does not usually require routine maintenance after it has been fully embedded in sound concrete. However, the completed joint should be inspected for concrete honeycombing, visible damage, defective welds, or movement-related cracking during the project’s quality-control and structural inspection procedures.
Note: Product-specific installation requirements, welding temperatures, fixing methods, and chemical-resistance limits should be confirmed using the manufacturer’s technical datasheet.
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