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Hydrostatic pressure in a concrete slab

Injection of PU along the fw joint around the perimeter - Waterstop Solutions

Hydrostatic pressure in a concrete slab

Hydrostatic pressure can cause water to be pushed through the concrete slab

Excess rain and hydrostatic pressure often lead to water ingress through cracks and cold joints in concrete floor slabs.
Video: Hydrostatic pressure in action – Water passing through the tiniest crack in a garage that is built into a hillside. This quick video shows how water passes through a fine crack of a painted slab a couple of days after the rain had stopped.
Hydrostatic Pressure. Water pushing through a tiny crack in a concrete slab. The garage is partially below ground, built into a hillside. 

Hydrostatic pressure can easily drive groundwater into basements through gaps and cracks and is one of the most common reasons for basement water ingress problems.

Hydrostatic pressure is commonly experienced during heavy rain due to the rising water table bringing the groundwater closer to the surface. If the basement is surrounded by saturated soil, hydrostatic pressure is created which forces the water into the basement slab and can force water to pass through even the tiniest cracks. Sites that are cut into a hillside stand a greater risk of having the hillside side affected by hydrostatic pressure if adequate drainage to redirect the water has not been installed. Poor drainage and inadequate grading away from the building may cause water to collect against the foundation. Steps taken to direct the water flow away from the basements/foundations will reduce the chances of water building up. This paired with adequate waterproofing will help protect the building from water ingress.
It is also commonly experienced that water finds its way in through the joint where the floor meets the wall, otherwise known as the cove joint or floor to wall joint. We often see that this joint effectively begins working as a highway passage for water. The floor to wall joint – especially when it is an infill slab where the slab is poured between existing walls – can be extremely vulnerable to water ingress/seepage. Water can leak in through the floor to wall joint even with an intact positive side waterproofing system in place. (Positive side waterproofing is where the waterproofing system has been installed to the soil facing side of the subsurface building components.)

The hydrostatic pressure from the rising water table and the lateral pressure from saturated soil can push the excess water into basement slabs, foundations and retaining walls where water can seep through cracks, porous building materials, holes, joints and/or compromised waterproofing.


Water infiltration seepage through floor to wall joint Water infiltration/seepage through the floor to wall joint after a period of heavy and persistent rain - Waterstop Solutions

Water infiltration/seepage through the floor to wall joint after a period of heavy and persistent rain.

You might be interested in reading this case story:  COST-EFFECTIVE REMEDIAL WATERPROOFING OF A DAMP RUMPUS ROOM

Are you experiencing damp walls or water leaking into your basement, car park or garage? We can help with any water ingress and/or concrete deterioration issues in QLD and NSW.

𝗕𝗼𝗼𝗸 𝗮𝗻 𝗶𝗻𝘀𝗽𝗲𝗰𝘁𝗶𝗼𝗻 𝘄𝗶𝘁𝗵 𝗼𝗻𝗲 𝗼𝗳 𝗼𝘂𝗿 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲𝗱 𝗶𝗻𝘀𝗽𝗲𝗰𝘁𝗼𝗿𝘀 𝘁𝗼𝗱𝗮𝘆!

In addition to our regular inspection service, we can provide audits of multi-story concrete buildings. The audit consists of a defect information list of items classed in priorities from P1 to P4, and their repair types. Ask us about how to secure a booking for this additional service. .

If you have experienced seepage issues during big rain events in the past, now is a good time to speak with a remedial leak sealing and concrete defect repair specialist to discuss a lasting solution to the problem. Once the storm season hits, the leaks are very likely to recommence and can potentially present a larger issue than before.

Seepage issues may typically originate through a crack in the concrete, a masonry wall, or a failed waterproof membrane or may be created by hydrostatic pressure under the foundation caused by the rising groundwater table.

Water seepw in where wall meets floor joint showing Efflorescence - Waterstop Solutions

Water seeps in where the wall meets the floor joint showing efflorescence.

If damp issues in your building are not properly remediated, it can lead to a multitude of issues in your building, such as concrete deterioration, destruction of building materials, pest infestation (white ants/termites), mould growth and belongings damaged by moisture. Over time, it could eventually lead to structural damage if left untreated.

Give Waterstop Solutions a call today if you need assistance and repairs done. We can help with inspection, provide you with tailored solutions and even help with the prioritisation of remedial works such as leak sealing, waterproof membrane refurbishment and concrete defect repairs for multistory buildings, commercial, industrial and civil sites.

Waterstop Solutions’ inspectors are equipped with extensive industry knowledge and the latest in non-invasive inspection technologies.  Our thorough site assessment and diagnosis process provides our clients with industry-leading, expert advice. Following an inspection, our specialist staff formulates a free, comprehensive quotation including recommendations tailored to the assessed concerns, which is then emailed to you in a timely manner.



We help provide water ingress solutions of many kinds; from minor seepage issues to more distressing situations. Every wet season, we are working tirelessly to help as many as possible as quickly as we can during this stressful time our clients are experiencing.

Give us a call to discuss the best protective treatment application for your vertical and horizontal surfaces to help you choose the appropriate product and methods to protect them and how to best prepare the surface before installation for best performance.

If you have any issues with water ingress, rooftop leaks, leaking balcony, leaking basement, wet lift pit, cracking concrete slabs, structural cracks, concrete deterioration, spalling concrete, concrete cancer, deteriorated joints, moisture, seepage, efflorescence, rising damp and/or high-flow active leaks in concrete structures, we would be happy to assist you. You are welcome to contact us with any questions that you may have.


Brisbane office: (07) 3205 1899   


Sydney office: (02) 9346 8308   

Email: [email protected]


Are you interested in finding out more about the various remedial building services we are providing?

Please click on the image below to download Waterstop Solutions Capability Statement

Waterstop Solutions Capability Statement

Waterstop Solutions Capability Statement is now available to download as PDF. (The image is clickable and opens up a link to our Capability Statement). 




Good maintenance begins with a proactive approach to maintain, keep, preserve and protect a building. 

Remember that seepage/water ingress into areas such as balconies, basements, concrete roofs, car parks and retaining walls, should not be ignored – call a remedial waterproofing professional today for an assessment to provide you with the best solution for your situation.

At Waterstop Solutions, we carry out a wide range of remedial works to concrete structures post-construction stage in Brisbane, Gold Coast, Sunshine Coast, Sydney and outlying areas in Queensland and New South Wales.

Equipped with major civil works experience, we can quickly determine the best approach to rectify all seepage and concrete deterioration issues.


It takes licenced remedial waterproofer and leak sealing experts like us at Waterstop Solutions to ensure that the pathways for water to ingress are properly sealed off. A depth of technical knowledge and experience, along with a proud reputation for integrity and reliability, has made Waterstop Solutions the go-to company for many Defect Managers working for major construction companies across Queensland and New South Wales.

We at Waterstop Solutions have the technical and practical expertise to diagnose the source of the leak and will provide you with our recommended solution to achieving an effective, high-quality, long-lasting repair to stop the water ingress with minimal disruption

We believe in and are committed to always delivering high-quality solutions by utilising the right products and techniques for each specific project combined with our industry-leading know-how on tap. We have a large talent pool of specialist leak sealing and concrete repair technicians with Certificate III in construction waterproofing in Queensland and New South Wales that are extensively trained in our systems and project execution methods.

The leadership positions on every Waterstop Solutions project are operated by highly qualified, certified and experienced industry professionals. Our in-house skills and expertise gained from more than 60 years of industry experience provide a full range of high-quality remedial waterproofing and concrete repair works to commercial buildings, civil infrastructures, industrial sites and residential properties. From waterproofing diagnostics, preventative and remediation solutions – All of our waterproofing solutions are quality guaranteed.


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