Sika Waterbar Splicing Iron (Heating Iron 213)

The Sika Waterbar Splicing Iron (Heating Iron 213) is a thermostatically controlled heating iron designed specifically for heat welding PVC and other thermoplastic waterstops at joints, transitions and intersections. Heat welding is the only recognised installation method for PVC waterstop – splicing by flame, adhesive or solvent is not acceptable. The iron melts the ends of two waterstop sections simultaneously so they can be fused into a continuous, watertight joint. It is used by waterproofing contractors and civil engineers on projects including basements, tunnels, water treatment plants, reservoirs and any below-grade concrete structure where hydrostatic pressure resistance is required.

Continuity across the full length of the waterstop installation is critical. Transitions, intersections and butt splices are the most common points of failure in a waterstop system – a poorly made weld can compromise the entire watertight diaphragm regardless of how well the rest of the installation is carried out. The waterstop profile, including ribs and centrebulb, must be maintained through all changes of direction and transitions. A correctly made heat weld, produced with the right iron at the correct temperature, preserves the profile geometry and mechanical properties of the parent material. Factory-made fabrications are recommended by Sika for all directional changes and intersections where possible.

The 213 is the large iron in Sika’s splicing iron range, with a welding face of approximately 4 inches by 14 inches. It features an adjustable temperature dial, an integral thermometer for accurate temperature monitoring during use and a peel-and-stick Teflon cover that prevents melted PVC from sticking to the iron face. The Teflon cover is replaceable – replacement covers (product 237) are available separately. The iron is constructed with a heavy-duty vinyl grip for safe handling during use.

For PVC waterstops, the welding iron should be heated to approximately 183°C (380°F). The thermometer on the iron allows the operator to monitor and control temperature throughout the welding process. Both ends of the waterstop should be held against opposing faces of the iron with firm, consistent pressure until at least 3mm of molten PVC appears around the full waterstop-to-iron interface on both pieces. The ends are then pulled away from the iron and immediately pressed together, with the joint held in correct alignment while it cools. The welded joint should be left to cool for at least 10 minutes before handling. The Teflon cover should be wiped clean after each weld to remove any residual PVC material.

Yes, the iron can be used for other thermoplastic waterstop materials, but the welding temperature differs. TPER and polyethylene waterstops require a higher temperature range than PVC. Always confirm the correct welding temperature for the specific waterstop material being used and refer to Sika’s method statement for the product in question. If you are unsure which iron size or settings are appropriate for your waterstop profile and material, contact the SPC team for guidance before starting work.