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Basement Leak Polyurethane Injection Leak Repair

Updated: Jul 22



From reviewing the typical applications above, it is clear that polyurethane injection is an extremely versatile waterproofing method that can be used to deal with any basement leak in a poured concrete structure, under all conditions. This versatility is attributable to the characteristics of our polyurethane resins which are:

  • Our activated polyurethane typically expands to 2.5 times it's volume; this is very desirable when filling large cavities or when the size of a cavity is unknown (as in the case of honeycombing).

  • The expansive force of polyurethane is significant; consequently, it will fill any and all gaps that it encounters - this is particularly useful when dealing with very porous concrete or when dealing with honeycombing. It will also expand wherever it can; following the path of least resistance, it will fill any and all voids encountered.

  • Our polyurethane resins are non-toxic. This makes them suitable for use with potable water systems such as cisterns.

  • Polyurethane sets rapidly in the presence of hydrogen. Since hydrogen molecules are a component of water (H2O), the presence of water during an injection actually increases the reactivity of the polyurethane. This makes polyurethane the ideal product to use when active basement leaks and/or significant hydrostatic pressure, are encountered.

  • The polyurethane resins that we use will not freeze and always remain flexible (not an attribute of all polyurethanes); this is desirable when the concrete surrounding it expands and contracts due to thermal cycling.

  • Polyurethane sets very quickly. This is essential in stopping leaks where significant hydrostatic pressure is present.

  • Polyurethane injections are conducted using hydraulic hoses which are crucial when accessibility to the repair area is limited.

  • At AquaGuard Injection & Waterproofing® we use polyurethane resins of varying viscosities; this gives us the ability to deal with any underground leak situation, from hairline cracks to large voids.


Types of leaks fixed by the injection of polyurethane:

  • Actively leaking cracks.

  • Cracks in wet or damp basement walls.

  • Previously repaired cracks (internally and/or externally) that are leaking. Note: an epoxy injection is not appropriate for use in repairing a failed crack injection.

  • Cracks full of mud or mineral deposits.

  • Cracks caused by corroding reinforcing bars (typically in reinforced concrete slabs).

  • Leaking forming tie-rod holes.

  • Leaking forming snap rods.

  • Leaking I-beam pockets.

  • Leaking underground structures in general (such as parking garage cracks and seams).

  • Underground pipe penetrations in a wall to accommodate electrical conduits, gas lines, air conditioning lines and pipes.

  • Expansion joints.

  • Honeycombing.

  • Pool bottoms (when access is possible).

  • Seams created by a cold pour.

  • Overhead concrete structures.

  • Gaps beneath the window frame and the top of the concrete wall cut-out.

#leakdoctor #basementleak #leakrepair


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