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Exterior Foundation Crack Repairs

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Exterior Foundation Crack Repairs

Montreal, West Island, Laval & South Shore

To permanently close a crack and waterproof your foundation wall, here at Akton we recommend an exterior crack repair using an injection with multiple membranes depending on the requirements.

While requiring some excavation, an injection done on the exterior of your building combined with multiple membranes, provides the highest degree of protection possible.  The process of layering 3 membranes on the outside of the foundation wall, guarantees the water will not get near the crack. Two elastomeric membranes to seal the foundation wall and the third a dimpled plastic drainage board called Delta-MS to eliminate any water pressure against the concrete, which is the primary reason for water infiltration.

Step 1:Lay plywood on the ground around the work area to keep the mess at a minimum.

Step 2: Excavate hole(s) approx 3.5 feet x 3.5 feet to the footing.

Step 3: Scrape and clean the wall with wire brushes in preparation for the repair.

Step 4: Repair the crack with injection

  • • Drill holes through the crack at a 45 degree angle every 6 inches.
  • • Screw in injector plugs with grease nipples to connect with the high pressure pumps.
  • • Flush out the crack with a mild acid to remove dust, dirt & debris from one injector to the next (Removal of any
    obstructions for the injection)
  • • Flush out the crack with water to clean out the acid.  Water is also a reactor/accelerator for the Polyurethane.
  • • Cover the crack with hydraulic cement to prevent the outflow of the Polyurethane from the injection.
  • • Inject the Polyurethane at 3000 to 10000 PSI to fill all the open voids in the concrete and to push through to the
    other side.
  • Step 5: Remove the injectors and fill the holes with hydraulic cement for a smooth surface.

    Step 6:Cover the hydraulic cement with 3 membranes

  • • Aqua-Bloc 770-06 (Liquid elastomeric membrane to seal the area)
  • • BlueSkin wp-200 (A rubber adhesive to seal the area)
  • • Delta-ms drainage board (Rigid dimpled plastic to remove water pressure against the foundation and to protect the area
    during backfill)
  • Step 7:Install a drain board (Delta-MS) to stop water pressure against the foundation. This protects the injection site and both membranes.

    Step 8:Fill in the hole carefully without damaging the new membranes and making sure to keep any large stones away from the foundation.

    Step 9:Clean the work area

    Download our step by step illustrated exterior crack injection PDF here.

    Exterior versus Interior Crack Repair

    Answer: Accessibility & Cost.
    Is your basement finished? If not an interior repair is the most inexpensive option.  If you want to repair a crack from the inside of your home and you have a finished basement, there will be additional contractor cost to repair the insulation, vapour barrier, gyprock, flooring and paint increasing the expense to a point where you should consider an external repair.  The most permanent solution is when you make a repair from the outside of the building.  You get the same quality injection combined with multiple membranes providing the highest degree of protection possible.

    Polyurethane versus Epoxy Injection

    Educate yourself on when to use Polyurethane or Epoxy for your foundation wall crack injection.

    French Drains

    If you have multiple cracks in your foundation or if you have a concrete block foundation, you may want to consider a full French Drain for your home.  Please visit our Exterior French Drain page for more information.

    Foundation Waterproofing Contractors

    Since 1979 Akton Injection has specialized in the repair of concrete foundation walls and concrete block foundation cracks for over a quarter of a century.  Just give us a call and our team of exterior crack repair specialists will work with you to find the best and most cost effective method to achieve a successful, permanent foundation repair.

    Call one of our representatives today for a FREE foundation repair quotation!



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