Sika Waterbar® O ES - PVC waterstop for expansion joints
Sika Waterbar® O ES: the PVC expansion joint waterstop with a central bulb
Sika Waterbar® O ES is a plasticized polyvinyl chloride (PVC) waterstop that is embedded in reinforced concrete to seal expansion joints. Its central bulb follows the movement of the joint without breaking the water barrier: depending on the type, it accommodates up to 40 mm of joint opening and 20 mm of shear, with water pressure resistance above 1.5 atm.
It is a wet-works product: it is placed before pouring the concrete, fixed to the reinforcement, and works as a geometric barrier. With a Shore A hardness of 70-75 and elongation above 250%, it withstands site handling and structural movement in a service range from -35 °C to +55 °C.
✅ Key advantages
Designed for moving joints: the central bulb absorbs expansion and shear without losing watertightness.
Four sections: O-15, O-22/2, O-30 and O-40 to match the waterstop to the expected water pressure and movement.
Wide temperature range: service from -35 °C to +55 °C.
Elastic and tough: elongation above 250% (UNE 53.510) and tensile strength above 130 kg/cm².
No expiry date: if stored correctly, the product does not expire.
Weldable on site: the sections can be joined together to keep the barrier continuous at corners and intersections.
🏗️ Recommended applications
Expansion joints in water tanks, swimming pools and reservoirs.
Buried reinforced concrete structures: basements, retaining walls and pits.
Hydraulic works: canals, WWTPs, DWTPs and manholes.
Large-surface slabs and floor slabs with structural joints.
Tunnels, galleries and underpasses.
📋 Technical specifications
Chemical base: polyvinyl chloride (PVC)
Colour: yellow
Presentation: 15 m rolls
Type O-15: 15 cm wide · max. joint 10 mm · max. shear 5 mm · max. water pressure 0.5 atm
Type O-22/2: 22 cm wide · max. joint 10 mm · max. shear 5 mm · max. water pressure 1.5 atm
Type O-30: 30 cm wide · max. joint 30 mm · max. shear 15 mm · max. water pressure > 1.5 atm
Type O-40: 40 cm wide · max. joint 40 mm · max. shear 20 mm · max. water pressure > 1.5 atm
Shore A hardness: 70-75 (UNE 53.130)
Tensile strength: > 130 kg/cm²
Elongation: > 250% (UNE 53.510)
Service temperature: -35 °C to +55 °C
Storage: the product does not expire if stored correctly, between +5 °C and +30 °C and in a horizontal position
Incompatibility: not suitable for contact with bitumen or bituminous materials
🧰 Directions for use
Choose the type (O-15 to O-40) according to the expected joint movement and the design water pressure.
Set out the joint and centre the bulb of the waterstop exactly on the axis of the expansion joint.
Fix the waterstop to the reinforcement with fixing clips, without piercing the bulb area.
Join the sections together, keeping the barrier continuous at corners, intersections and junctions.
Form and pour the first half; compact well around the waterstop without bringing the vibrator close to it.
Clean the exposed face before pouring the second half and check that the bulb is still centred.
Do not allow the waterstop to come into contact with bitumen or bituminous products.
🛡️ Standards and certificates
UNE 53.130 — Shore A hardness
UNE 53.510 — elongation at break
📦 Supply formats
15 m roll · Units per box and per pallet: not declared by Sika España
💡 Professional tip: the most common mistake with bulb waterstops is pouring the concrete with the bulb off-centre or pressed against the formwork. If the bulb is not left free over the axis of the joint, it cannot deform when the joint opens and the waterstop ends up tearing. And watch out for bitumen: any contact with bituminous primers or membranes attacks plasticized PVC. For construction joints without movement, the Sika Waterbar® FB-125 from FPO is narrower and quicker to install.
Technical data according to the Sika Waterbar® O ES Product Data Sheet from Sika España (version 01.02, July 2023).
Frequently asked questions about Sika products (mortars, adhesives and sealants)
How do I know which size and quantity to buy?
Each product page includes the approximate yield or consumption (for example kg/m² or metres of bead per cartridge) in the "Technical specifications" section. Calculate the surface area or thickness of your project and multiply by that consumption to find out how many units you need. If in doubt, contact us with the measurements of your job.
Where can I find the complete technical data sheet (Product Data Sheet)?
The description of each product already includes the main technical data (strengths, setting times, application temperature, applicable standards, etc.), taken from the official Sika Spain Product Data Sheet. If you need the complete PDF data sheet or the safety data sheet (SDS), write to us and we will send it to you.
Do these products comply with European regulations (CE marking)?
Most Sika products carry the CE marking in accordance with the relevant European standard (for example EN 1504 for structural repair, EN 12004 for tile adhesives, EN 13888 for grouts or EN 15651 for sealants). The exact standard for each reference is detailed in the "Standards and certificates" section of its product page.
What protective equipment do I need to apply them?
It depends on the product: cement-based mortars and adhesives are usually irritating to skin and eyes (gloves, goggles and a mask are recommended), while polyurethane sealants and adhesives require good ventilation. Always check the safety section of the product page and its safety data sheet (SDS) before use.
How should I store these products and how long do they last unopened?
Shelf life and storage conditions (temperature, humidity, protection from light) vary depending on the type of product (cementitious, polyurethane, epoxy, etc.) and are stated on the packaging and in the data sheet of each reference. In general, it is advisable to store in a dry place, protected from frost and direct sunlight.
Can I return a Sika product if I haven't used it?
Yes, you have 14 calendar days from receipt to exercise your right of withdrawal, provided the product is in its original packaging and has not been opened. The cost of return shipping is borne by the customer. Contact us at info@vetonek.com or via WhatsApp on +34 629 571 735.
How long does my order take to arrive?
We ship to mainland Spain, the Balearic Islands, Portugal and the other European countries we serve (France, Belgium, the Netherlands, Germany, Italy, etc.). The estimated delivery time is 3 to 9 working days (no shipping to the Canary Islands, Ceuta or Melilla).
Todo excelente. Tras una primera equivocación con el producto elegido, el equipo de atención al cliente se puedo a trabajar para solucionar el problema y darme una solución adecuada.
