Water leaks under the first-floor slab of a building can pose significant risks, including structural damage, mold growth, and compromised indoor air quality. Addressing these leaks promptly and effectively is crucial to maintaining the integrity of the property and ensuring the health and safety of its occupants. At AnyLeak, we specialize in diagnosing and repairing leaks under first-floor slabs using state-of-the-art technology and expert methodologies.

Understanding Leaks Under First-Floor Slabs

Common Causes of Slab Leaks

Hydrostatic Pressure: The pressure exerted by groundwater can force water through cracks or weak points in the slab.

Pipe Leaks: Corroded, damaged, or improperly installed pipes running beneath the slab can leak, leading to water accumulation.

Foundation Shifts: Natural settling or shifts in the foundation can create cracks in the slab, allowing water to seep through.

Poor Drainage: Inadequate drainage around the property can lead to water pooling under the slab, increasing the likelihood of leaks.

Faulty Construction: Poor construction practices, such as insufficient waterproofing or subpar materials, can contribute to slab leaks.

Types of Slab Leaks

Hydrostatic Leaks: These occur when groundwater pressure forces water up through the slab. They are often identified by wet spots or water pooling on the floor.

Plumbing Leaks: Leaks from pipes running under the slab can lead to water accumulation and damage. Signs include increased water bills, dampness, or warm spots on the floor.

Crack Leaks: Water can seep through cracks in the slab caused by structural shifts or settling. These leaks can be sporadic or continuous, depending on the water source and pressure.

Our Approach to Repairing Slab Leaks

Initial Assessment

Thorough Inspection: We start with a comprehensive inspection to identify the source and extent of the leak. This includes visual assessments, moisture mapping, and examining the property’s drainage system.

Leak Detection Technology: We use advanced tools such as infrared thermal imaging, acoustic leak detection, and moisture sensors to pinpoint leak locations without invasive procedures.

Repair Solutions

Pipe Repair and Replacement

Leak Detection: Using acoustic and pressure testing techniques, we locate the exact point of pipe leaks.

Pipe Repair: For minor leaks, we use epoxy lining to seal the pipe internally. This method is minimally invasive and effective for small cracks.

Pipe Replacement: For extensive damage, we may need to replace sections of the pipe. This involves cutting the slab, replacing the damaged pipe, and restoring the slab.

Crack Injection

Epoxy Injection: We use epoxy injections to seal structural cracks in the slab. Epoxy is a strong adhesive that restores the integrity of the concrete and prevents water ingress.

Polyurethane Injection: For non-structural cracks, polyurethane is injected. This material expands to fill the crack and create a waterproof barrier.

Interior and Exterior Waterproofing

Interior Coatings: Applying waterproof coatings to the interior surface of the slab can provide an additional layer of protection against water seepage.

Exterior Membranes: If accessible, we apply waterproof membranes to the exterior of the slab to prevent water from penetrating the foundation.

Drainage Solutions

French Drains: Installing a French drain system around the perimeter of the property helps to divert water away from the foundation. This involves creating a trench, lining it with gravel, and installing a perforated pipe to collect and channel water away.

Sump Pumps: We install sump pumps in areas prone to water accumulation. These pumps remove water from beneath the slab and prevent it from seeping through.

Advanced Technologies

Infrared Thermal Imaging

Infrared thermal imaging helps us detect temperature variations and hidden moisture beneath the slab. This non-invasive technology allows for precise identification of leak sources without extensive drilling or excavation.

Acoustic Leak Detection

Acoustic leak detection involves using sensitive microphones to listen for the sound of water leaking through pipes or cracks under the slab. This method is effective in locating leaks that are not visible on the surface.

Moisture Sensors

Moisture sensors are placed in strategic locations under the slab to monitor humidity levels and detect any increase in moisture content. These sensors provide real-time data, allowing us to take proactive measures to prevent leaks.

Preventative Measures

Regular Maintenance

Annual Inspections: Regular inspections of the plumbing system and the foundation can help identify potential issues before they become significant problems. We recommend annual inspections to ensure the integrity of the waterproofing systems.

Drainage System Maintenance: Keeping drainage systems, including gutters and downspouts, clear of debris is essential to prevent water accumulation around the foundation.

Landscape Management

Proper Grading: Ensuring that the landscape around the foundation is graded to direct water away from the slab is crucial. We provide grading services to correct any issues and improve drainage.

Plant Selection: Choosing plants with deep root systems can help absorb excess water and stabilize the soil around the foundation.

Waterproofing Upgrades

Enhanced Membranes: Upgrading to more advanced waterproofing membranes can provide better protection against water ingress and hydrostatic pressure.

Advanced Drainage Solutions: Implementing advanced drainage solutions, such as underground piping systems, can enhance the efficiency of water management around the foundation.

Case Studies

Residential Slab Leak Repair

Initial Situation

A homeowner in Surrey, BC, contacted AnyLeak after noticing wet spots on their first-floor carpet and an unexplained increase in their water bill. Our team conducted a thorough inspection and identified a leak in the plumbing beneath the slab.


Using acoustic leak detection, we pinpointed the exact location of the leak. We then cut a small section of the slab, repaired the damaged pipe with epoxy lining, and restored the slab. We also applied an interior waterproof coating to the slab for added protection.


The homeowner experienced no further issues with leaks, and their water bill returned to normal. The timely and efficient repair prevented extensive water damage and potential mold growth.

Commercial Property Slab Leak Repair

Initial Situation

A commercial property manager in Richmond, BC, reported persistent dampness and mold growth in the ground-floor storage area. Our inspection revealed multiple cracks in the slab caused by foundation shifts and poor drainage.


We implemented a comprehensive solution that included epoxy injection to seal the cracks, installation of a French drain system around the property, and application of an exterior waterproof membrane. Additionally, we installed moisture sensors to monitor humidity levels beneath the slab.


The storage area remained dry, and the mold issue was resolved. The property manager was impressed with the effectiveness of our solution and the improvement in the building’s structural integrity.


Leaks under the first-floor slab can cause significant damage if not addressed promptly and effectively. At AnyLeak, we offer comprehensive solutions to diagnose and repair slab leaks, using advanced technology and expert methodologies. Whether dealing with hydrostatic leaks, plumbing leaks, or cracks, we have the expertise to provide long-lasting repairs. Contact us today to schedule an inspection and protect your property from the damaging effects of slab leaks.

Contact Information

Email: info@Anyleak.ca
Phone: +1 (604) 269-5325