Popular: Sikaflex · waterproofing · grout · data sheets
Sewage and wastewater structures leak out, let groundwater in and are eaten away by aggressive effluent. Plug and rebuild the concrete, waterproof it, and add a chemical-resistant lining where the effluent is aggressive.
General guidance based on the manufacturer data sheets. Site conditions differ: confirm the system with MCT before you start. Where we do not name a product, ask us and we will confirm the right one.
Add SikaControl-760 (sewage and water treatment plants, p.1) or Sika Plastocrete N PK (sewerage works, p.1) to the concrete. Cast Sika Waterbar V-20 L SH into construction joints and O-20 SH into expansion joints; both list sewage plants (p.1).
SikaControl®-760 should be used in all structural concrete that is constantly or intermittently in contact with water such as sea walls, tunnels, basements, structural and precast concrete. SikaControl®-760 can also be used as crystalline waterproofing admixture for cement mortars and plasters. T… (TDS p.1)
Sika® Plastocrete® N PK is recommended for use in waterproofing of masonry and concrete structures such as: Reservoirs and dams , Sewerage works , Canals , Culverts, tunnels , Water tanks, swimming pools and wherever waterproof concrete is required . (TDS p.1)
Sika Waterbar® V-20 L SH is used to waterproof construction joints in concrete structures such as those in water retaining structures, including reservoirs, canals, sewage plants, dams, swimming pools etc. (TDS p.1)
Sika Waterbar® O-20 SH are used to waterproof expansion joints in concrete structures such as those in water retaining structures, including reservoirs, canals, sewage plants, dams, swimming pools etc. (TDS p.1)
Bypass the flow and follow confined-space safety rules: ventilate and test the air before entry. Water-jet away slime, sludge and weak concrete back to a sound surface.
Plug running holes and static cracks: SikaSet Waterplug lists sewers (p.1); a Sika-4a quick-set mortar lists manholes and concrete pipes (p.1) and must be used with fresh ordinary Portland cement (p.2). Water-bearing cracks and joints: Sika Injection-306, experienced professionals only (p.1).
Non-moving (static) cracks and holes with running water or moisture seepage For immersion service For anchoring vertical bolts Basements Foundations Retaining walls Sewers Locations Vertical, overhead, or horizontal Interior or exterior Above or below grade… (TDS p.1)
Sika®-4a is used as preliminary waterproofing work on wet surfaces or where there is general infiltration of water, prior to the application of subsequent cementitious render or gunite. (TDS p.1)
The right product here depends on your site. We confirm it before naming it.
SikaEmaco S 488 is an R4 structural repair mortar listed for water treatment and sewerage facilities before subsequent coating (p.1); apply between +5 °C and +35 °C (p.2). Use SikaRep PK for general spalling (p.1).
SikaEmaco® S 488 is used for the structural repair of concrete elements such as: Columns, piers and cross beams of bridges, Cooling towers and chimneys and other industrial environments, Water treatment and sewerage facilities before subsequent coating, Tunnels, pipes, outfalls and all below grou… (TDS p.1)
The right product here depends on your site. We confirm it before naming it.
SikaSeal-105 PK lists water and sewage works such as tanks and manholes and works against positive and negative water pressure (p.1). The surface needs at least 1.0 N/mm² pull-off and must be pre-dampened (p.2).
SikaSeal®-105 PK is used as an economical and easy to use as waterproofing slurry both for external and internal applications. SikaSeal®-105 PK is suitable for the following applications: Water and sewage works, such as tanks and manholes, Basements and lift pits, Retaining walls and bridge struc… (TDS p.1)
Sika Permacor-3326 EG H lines sludge digesters and waste-water tanks and bridges cracks up to 3 mm as a laminate (p.1). Sikagard-63 N lists sludge tanks (p.1) and must not go on moist substrates (p.3). Sikagard PW is sewage resistant (p.1). All three are for experienced professionals only (p.1 of each).
Sika® Permacor®-3326 EG H is ideally suited for the corrosion protection of steel and concrete surfaces exposed to various media. (TDS p.1)
Chemical resistant protective coating on: Concrete, Stone, Cementitious mortars, Renderings, Epoxy cement, Epoxy resin-based products. (TDS p.1)
Chemical resistant protective layer on concrete, structural cementitious mortars, epoxy cement, epoxy resin based products and steel Protection of concrete surfaces / foundations below ground level Lining in storage tanks, manholes, intakes and silos etc. (TDS p.1)
Movement joints in plant floors and walls: Sikaflex PRO-3 lists sewage treatment plants (p.1). Joints, cracks and pipe penetrations with expected settlement: Sikadur-Combiflex SG-20 P tape, listed for sewage treatment plants (p.1).
Horizontal and vertical interior and exterior sealing joint applications: Food industry, Cleanrooms, Sewage treatment plants, Tunnels Sealing horizontal and vertical joints for:, Floors, Pedestrian and traffic areas. (TDS p.1)
Sikadur-Combiflex® SG-20 P is used for sealing: Movement joints, Construction joints, Pipe penetrations, Cracks, Building components where differential settlement is expected Sikadur-Combiflex® SG-20 P is used for the following areas:, Tunnels. (TDS p.1)
A starting point for a site proposal. Quantities, prices and the final specification follow a site visit or photos.
| Step | Product | Pack | Source |
|---|---|---|---|
| 1. New structures: watertight concrete and joints | SikaControl-760 | SikaControl®-760 is available in 5 Kg & 25 kg pack. | TDS p.1 · March 2025, Version 04.01 |
| 1. New structures: watertight concrete and joints | Sika Plastocrete N PK | 05 ltr jerry can | TDS p.1 · February 2026, Version 01.01 |
| 1. New structures: watertight concrete and joints | Sika Waterbar V-20 L SH | — | TDS p.1 · May 2021, Version 01.01 |
| 1. New structures: watertight concrete and joints | Sika Waterbar O-20 SH | 15 m rolls | TDS p.1 · May 2021, Version 02.01 |
| 3. Stop infiltration | SikaSet Waterplug | — | TDS p.1 · September 2024, Version 02.01 |
| 3. Stop infiltration | Sika-4a | — | TDS p.1 · May 2021, Version 01.01 |
| 4. Rebuild the concrete | SikaEmaco S 488 | 25 kg bag | TDS p.1 · June 2025, Version 05.01 |
| 5. Waterproof the structure | SikaSeal-105 PK | — | TDS p.1 · February 2026, Version 02.01 |
| 6. Chemical-resistant lining where effluent is aggressive | Sika Permacor-3326 EG H (professionals) | — | TDS p.1 · December 2022, Version 05.02 |
| 6. Chemical-resistant lining where effluent is aggressive | Sikagard-63 N (professionals) | 10 kg Kit consisting of | TDS p.1 · May 2025, Version 04.02 |
| 6. Chemical-resistant lining where effluent is aggressive | Sikagard PW (professionals) | — | TDS p.1 · May 2021, Version 02.01 |
| 7. Seal joints | Sikaflex PRO-3 | 600 ml cylindrical foil pack | TDS p.1 · May 2021, Version 03.01 |
| 7. Seal joints | Sikadur-Combiflex SG-20 P | — | TDS p.1 · May 2025, Version 04.01 |
Sikagard PW is listed as sewage resistant (p.1). Sika Permacor-3326 EG H has high chemical resistance to water, aggressive effluents and waste water (p.1). Both are for experienced professionals.
Sikagard-63 N must not be applied on moist substrates (p.3) and Sikagard PW not on substrates with rising moisture (p.3). The cement-based SikaSeal-105 PK goes on a pre-dampened surface (p.2), so it is used where the concrete stays damp.
Running water through holes and static cracks is plugged with SikaSet Waterplug (p.1) or Sika-4a mortar (p.1). Water-bearing cracks and joints are injected with Sika Injection-306 (p.1). SikaSeal-105 PK then works against negative water pressure (p.1).
The data sheets assume a clean, prepared surface (SikaSeal-105 PK p.2; SikaEmaco S 488 p.2), so the flow must be bypassed. Ask us: it depends on site conditions.
Steps and product facts are taken from the manufacturer data sheets (page cited). Products are named only where the data sheet confirms the use; quantities follow a site visit or photos. General guidance: check the data sheet or ask us before you start.