PREBAR PVC WATERSTOP PVC waterstop
Heat-weldable thermoplastic PVC waterstop profile for cast-in-situ concrete joints
Heat-weldable PVC waterstop cast into concrete joints, with factory-made tees, crosses and corners.
PREBAR PVC WATERSTOP sizes and key figures
Blue PVC profile cast into construction and expansion joints, horizontal or vertical, to form a continuous watertight barrier. Joins are heat welded on site at 190–200°C.
- Tensile
- 15.49 MPaBS 2782.320A, against a 12.00 MPa minimum · TDS p1
- Elongation
- 330%at break, against a 300% minimum, BS 2782.320A · TDS p1
- Hardness
- 75 Shore ABS 2782:365B · TDS p2
- Service temp
- −25 to +70°Crange in service · TDS p2
- Weld at
- 190–200°Capproximately, do not overheat · TDS p2
- Widths
- 150–320 mm150, 200, 250 and 320 mm profiles · TDS p2
- Roll length
- 12–20 m20 m at 150 and 200 mm, 15 m at 250 mm, 12 m at 320 mm · TDS p2
- Water absorb.
- 0.19%at 23°C, ISO 62 · TDS p2
- Shelf life
- 5 yearsfrom production, stored +10°C to +40°C · TDS p4
From the FORSPEC data sheet, TDS-PREBAR · Revision 2 · 12 November 2026. Times are at 25°C and 50% relative humidity unless the data sheet says otherwise.
Where PREBAR PVC WATERSTOP is used
Use it for
- Basement slabs, lift pits, retaining walls and suspended slabs
- Swimming pools, reservoirs, water towers and sewage tanks
- Dams, culverts, canals and spillways
- Basements, underground car parks, tunnels and subways
- Roof decks and podium areas
- Construction and expansion joints in cast-in-situ concrete
Know before you start
- Not a waterproofing membrane: it seals a joint, not a surface
- Needs full concrete encasement and the design cover on both sides
- No folded, kinked, taped, glued or overlapped joins: heat weld only
- Do not overheat when welding: PVC degrades above the stated range
How to apply PREBAR PVC WATERSTOP
- 01
Check
Surfaces clean and dry. Formwork set so the waterstop sits centred with design cover both sides. Correct profile chosen, and prefabricated intersection pieces on site.
- 02
Place
Cut with a clean blade. Centre and align the waterstop in the joint. Secure vertical installations with anchors or fixings so it stays put through the pour.
- 03
Weld
Heat weld all joins at about 190–200°C, fully through the section. Use prefabricated pieces at every tee, cross and corner.
- 04
Inspect
Check every weld for full fusion, alignment and no voids. Let welds cool fully before moving the section. Confirm it is secured, centred and undamaged before the pour.
- 05
Pour
Place and compact concrete to fully encase the profile with no voids, taking care it stays in position.
- 06
Second pour
Protect the exposed half from damage, contamination and splatter. Clean it thoroughly just before the second pour so the concrete bonds to a clean profile.
A short guide from the data sheet. Read the full PREBAR PVC WATERSTOP TDS before you start.
Learn to install it
Hands-on FORSPEC training that covers PREBAR PVC WATERSTOP.
Drawings for the systems it goes in
FORSPEC standard details as PDF and DXF. Each sheet is a generic detail: the specification names the products.
PREBAR PVC WATERSTOP test reports and compliance
- Tensile strength
- 15.49 MPa, pass (minimum 12.00 MPa)BS 2782.320A
- Elongation at break
- 330%, pass (minimum 300%)BS 2782.320A
- Specific gravity
- 1.41 g/cm³, pass (1.38 ± 0.03)BS 2782:620B
- Hardness
- 75 Shore A, pass (75 ± 5)BS 2782:365B
- Water absorption at 23°C
- 0.19%ISO 62
- Thermal stability, Congo Red at 180°C
- 50 minutes minimumBS 2782:130A
Results as stated in the data sheet, TDS-PREBAR · Revision 2 · 12 November 2026. Warranty up to 25 years, depending on the system: ask FORSPEC which term applies to your system.
PREBAR PVC WATERSTOP questions
What sizes and roll lengths do I get?
150 mm and 200 mm profiles come in 20 m rolls, 250 mm in 15 m rolls and 320 mm in 12 m rolls. Allow the measured joint length plus intersections plus 10% for wastage.
How do I join lengths?
Heat weld at about 190–200°C through the full section. Taped, glued or overlapped joins are not acceptable.
Do I need prefabricated corners and tees?
They are strongly recommended in place of site fabrication. Use one unit per tee, cross or corner.
Is it a waterproofing membrane?
No. It seals a joint inside the structure and must be fully encased in concrete with the design cover on both sides. Profile selection and joint design are the project engineer's call.
What temperature can it take?
A service range of −25°C to +70°C. Store between +10°C and +40°C, out of direct sunlight.
Used with PREBAR PVC WATERSTOP
PREBAR PVC WATERSTOP data sheet
Always work from the current data sheet. Every FORSPEC TDS and SDS →
Specify it. Or buy it.
Send the drawings or photos and FORSPEC comes back with the system, the details and the quantities. Or find a FORSPEC stockist for PREBAR PVC WATERSTOP.