Repair Systems — Basement Water Ingress
Acrylic injection systems
Technical product reference for acrylic acrylate gel injection systems used to seal fine cracks, hairline cracks, and construction joints against water ingress in basement and below-ground structures on Australian Class 2 strata and commercial buildings. Covers product selection, viscosity, gel time, injection pressure, and comparison with hydrophilic PU systems.
What are acrylic injection systems?
Acrylic (acrylate) injection systems are multi-component resins with exceptionally low viscosity before gelation — comparable to water — enabling them to penetrate hairline cracks and fine pores in concrete that cannot be reached by polyurethane injection resins. When the components are mixed at the injection head a chemical reaction initiates gelation, forming a flexible, water-impermeable gel within the crack. The gel time is adjustable (typically 10–60 min) by varying the component ratio.
Unlike PU foam, acrylic gel does not expand — it fills the void without generating lateral pressure, making it appropriate for fine cracks in concrete with limited cover or in unreinforced masonry where PU expansion could cause spalling. It is also used for curtain (sealing-wall) injection in damp / saturated ground. Acrylic injection requires a 2-component metering pump and a specialist applicator; specify it where crack width is the limiting constraint, otherwise hydrophilic PU is simpler and more widely used.
Product Reference
Individual products — one card each — scroll to view all
Sika Australia
Sika Injection-306
Acrylic (polyacrylic) injection gel — fine cracks / curtain injection
Sika Injection-306 is a solvent-free acrylic (polyacrylic) injection resin with a versatile, adjustable reaction time (10–60 min) and very low (water-like) viscosity, usable in groundwater protection zones. It is permanently elastic, absorbs limited movement, and reversibly swells/shrinks with moisture (pH 9–10). Used for curtain (sealing-wall) injection in damp / saturated ground, repair of damaged waterproofing membranes, and injection of SikaFuko hoses at construction joints; its low viscosity suits hairline cracks below 0.3 mm. Requires a 2-component metering pump. EN 1504-5 (injection, principle C).
Master Builders Solutions
Master Builders acrylic gel injection — CONFIRM product
Acrylic gel injection — current product to be confirmed
The product previously listed here as 'BASF MasterInject 1315' is incorrect for the acrylic-injection category: MasterInject 1315 (formerly Concresive 1315) is a low-viscosity EPOXY resin for crack injection, not an acrylic gel. Master Builders Solutions (the former BASF Construction Chemicals business) does supply acrylic gel injection resins — confirm the correct current AU product name and its technical data with Master Builders Solutions Australia before specifying as an alternative to Sika Injection-306.
System Comparison
Acrylic injection systems — confirm all selections against the current manufacturer TDS before specifying.
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Disclaimer
This page provides general technical information only. Final product selection must be confirmed against the current manufacturer technical data sheet, project specification, substrate condition, and structural engineer advice where applicable. Basement and below-ground waterproofing involves hydrostatic pressure — confirm system selection with a qualified waterproofing consultant before specifying. Do not rely on this reference as a substitute for professional advice.
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