Leaky concrete basements are a common problem in existing buildings. Water can enter through concrete walls, cracks, construction joints or below-ground structures and create damp, unhealthy conditions.
Elephant NZ repairs leaking basements across Auckland using practical interior waterproofing systems, including our 3-coat and 5-coat systems. These systems can be a more cost-effective option when external excavation is difficult, expensive or not practical.
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More than 30% of our waterproofing work involves remedial waterproofing and leaky basement repair. As a result, our team understands the challenges that come with existing concrete structures, limited access and active water ingress.
Concrete basements can leak for several reasons. For example, water pressure can build behind basement walls after heavy rain, especially where drainage is poor or the original waterproofing has failed.
Water can also enter through cracks, construction joints, penetrations or weak areas in the concrete. Therefore, the first step is to inspect the basement and identify where the water is entering.
For many existing basements, digging around the outside of the building is not practical. In these cases, an interior waterproofing system can be a more cost-effective way to repair the basement from the inside.
Depending on the level of water ingress and the condition of the concrete, Elephant NZ may recommend either a 3-coat or 5-coat interior waterproofing system. These systems create a durable waterproof barrier on the internal concrete surface.
Before any coating system starts, our team prepares the concrete surface carefully. This may include cleaning, grinding, removing loose material and repairing defects where required.
After preparation, we apply the selected waterproofing system in layers. Each coat forms part of the final waterproofing barrier, so preparation, timing and detailing are critical.
Interior waterproofing and external waterproofing both have their place. The right option depends on the building, the access, the water pressure and the condition of the concrete.
Often suitable for existing basements where excavation is difficult, costly or disruptive.
Often preferred for new construction or when the outside of the basement is easy to access.
For new projects, you may also need our foundation waterproofing Auckland service. For existing leaking basements, our interior 3-coat and 5-coat systems may be a more practical repair option.
Good basement waterproofing depends on the right product, preparation and installation method. Therefore, Elephant NZ recommends the system based on the structure, water pressure, concrete condition and access.
For more technical product information, you can also view Allco waterproofing system information.
Yes, many leaking concrete basements can be repaired from the inside. However, the right system depends on the concrete condition, water pressure, access and the cause of the leak.
In many existing buildings, interior waterproofing can be more cost-effective than external excavation. This is especially true when access around the basement is limited or excavation would affect paths, landscaping or structures.
The difference usually relates to the number of waterproofing layers and the level of protection required. Elephant NZ recommends the system based on the condition of the concrete and the level of water ingress.
Yes, we can repair cracks and defects where required before applying the waterproofing system. The repair method depends on the type, size and movement of the crack.
Yes, Elephant NZ provides leaky basement repair and interior basement waterproofing across Auckland and selected projects throughout New Zealand.
Talk to Elephant NZ about a practical interior waterproofing solution for your basement.
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