26 Feb Leaking Basement Waterproofing Repair
What can we do to keep your basement and car park dry and prevent moisture from making its way in?
Water leaking into the basement after heavy rain is a common occurrence. Water always finds a way, so basement waterproofing and adequate drainage are especially needed in cases where groundwater is likely to build up in soil and cause a rise in the water table closer to the surface.
There are many ways water can enter a basement or below grade structure from the foundation walls including basement windows, foundation cracks, pipe penetration leaks and wall seepage.
Groundwater that enters a basement through the floor slab or appears in an area known as the cove joint, which is where the floor and walls meet (floor to wall joint) is commonly referred to as caused by hydrostatic pressure.
For a concrete slab to be impacted by hydrostatic pressure, it must be below the water table or intrude into a natural water pathway.
We often see in Brisbane and Sydney areas that buildings that are cut into a hillside stand a greater risk of having the “hillside side” affected by hydrostatic pressure if adequate steps to redirect the water are not taken. Poor drainage may cause water to collect against a concrete foundation and retaining walls during heavy and persistent rain events and may build up the volume to cause problems attributable to lateral and hydrostatic pressure. Steps taken to direct water flow away from basements/foundations and eliminate pooling will reduce the chances of water build up around the building.
Water ingress in the floor to wall joint is commonly experienced during heavy rain due to the rising water table bringing the groundwater closer to the surface. This increases the hydrostatic pressure on to the slab of your building and can force water passing through the construction joint between the floor and the wall. This joint effectively begins working as a highway passage for water.
How to keep water away from the basement structure:
- Inspect the walls and floors. If cracks appear, repair or seal them immediately. Water has a way of finding a small entryway and then making it bigger over time.
- Install gutters and downspouts away from the foundation.
- Ensure that the ground has a graded fall that guides water away from the foundation.
- Drainage layer of gravel eliminates trapping water-laden soil against foundation walls.
- Drains below slabs that direct water to natural exit.
- Ensure that the interior basement waterproofing is intact to prevent water ingress. Wall to floor joints in infill slabs and retaining walls often act as basement leakage points. This can cost-effectively be remediated with targeted high-pressure injection into the joints and cracks to create a deep waterproof seal. This treatment can be followed by the application of a protective coating or a negative side membrane.
Basement leakage points. Common places water may enter into your basement or other areas of your property that are subterranean.
A leaking concrete structure can cause a ripple effect on other building assets
Water seeping through concrete dissolves minerals such as calcium hydroxide, which is extremely corrosive to galvanised steel. In the photo below, you can see that the water that has been seeping through the concrete was dripping onto the air duct causing it to rust and break apart. Additional factors that corrode galvanised steel and reinforcement in concrete are high humidity and sodium chloride (salt) in water or air.
The durability of concrete structures is under constant threat from carbonation and crack causing movements, which can lead to water ingress affecting the durability of the concrete structure. Regular inspections and preventative maintenance crucial to help protect assets from deterioration, thus extending the lifetime of your asset investment. Issues like cracks in concrete, water seepage and spalling affect the integrity and longevity of the asset, so they are best to remediate at an early stage to help decrease the expenses of extensive remedial repairs.
Concrete crack injection and concrete leak sealing repair of basements and underground car parks
At Waterstop Solutions, we specialise in interior basement waterproofing systems
A wet basement can be treated by targeted high-pressure injection into the wall-floor joint and/or into vertical joints, such as between contiguous piles. The injected hydrophilic polyurethane liquid chases the water deep into cracks and forms a flexible watertight seal. This remedial waterproofing treatment can be followed by the application of an epoxy coating or a negative side membrane.
The waterproofing membrane systems we use create an effective barrier against waterborne salts. They are also resistant to atmospheric gases and comply with potable water safety standards.
The systems are supported by the manufacturer’s warranty for 10 years, which is extendable to a further 10 years with a maintenance application.
Our highly-skilled technicians frequently perform remedial high-pressure leak-sealing injection to stop water seeping into building structures. Whilst other remedial companies may average once a year (or at most once a month), our technicians perform quality high-pressure leak-sealing injection work several times per week.
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 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 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.
Equipped with major civil works experience, we can quickly determine the best approach to rectify all seepage and concrete deterioration issues.