top of page

How To Fix A Foundation Leak From The Outside | CONSPAR

Fixing a foundation leak from the outside can be a challenging task, but it is essential for maintaining the structural integrity and safety of your home. In Perth, where heavy rains and high humidity are common, foundation leaks can be a serious problem. Here are some steps to fix a foundation leak from the outside that are relevant to buildings in Perth.

  1. Identify the source of the leak: The first step in fixing a foundation leak is to identify the source of the problem. Look for any visible signs of water damage, such as dampness or mould growth, and inspect the exterior of the building for any cracks or gaps in the foundation or walls. It may also be helpful to check the drainage system around your home to ensure that water is flowing away from the foundation.

  2. Excavate the area: Once you have identified the source of the leak, you will need to excavate the area around the foundation to access the damaged area. This may require heavy machinery, such as a backhoe or excavator, and should be done carefully to avoid causing any additional damage to the foundation or surrounding structures. This method is particularly difficult and expensive where the subject wall is on a boundary or adjacent to services and utilities.

  3. Repair the damaged area: Once the damaged area is accessible, you will need to repair it using the appropriate materials and techniques. For minor cracks or gaps, you can use hydraulic cement or epoxy-based sealers. For more severe damage, you may need to replace the affected section of the foundation or wall.

  4. Apply a waterproofing membrane: Once the damaged area is repaired, it's essential to apply a waterproofing membrane to prevent future leaks. The membrane should be applied to the exterior of the foundation or wall and should extend at least 12 inches above the soil level. There are several types of waterproofing membranes available, including asphaltic coatings, rubberised asphalt, and polyurethane-based products.

  5. Install proper drainage: In addition to repairing the damaged area and applying a waterproofing membrane, it's also essential to install proper drainage around the foundation to prevent future leaks. This may include installing a French drain or sump pump, or simply ensuring that the surrounding soil is sloped away from the foundation.

In summary, fixing a foundation leak from the outside requires careful planning, excavation, and repair work. It's essential to identify the source of the leak, repair any damaged areas, and apply a waterproofing membrane to prevent future leaks. By following these steps, you can ensure that your home remains safe, dry, and structurally sound, even in the challenging climate of Perth.

Conspar can assist you with the above steps and we have a proven track record for delivering long-lasting - and documented - results. Our family company has been solving identical building issues in Perth since 1969. Get started by contacting us here.

Recent Posts

See All


Weatherproofing of masonry has been a crucial aspect of construction for decades, with historical houses built 1950 and earlier serving as a testament to its importance. Observing the prevalence of we

bottom of page