Permanent Modular Formwork Systems For Concrete Walls – Are They Waterproof?
Concrete filled polymer-based Stay-In-Place (SIP) formwork creates load-bearing permanent walls and columns and provides a cost-effective construction system. By encapsulating the concrete fill, the interlocking snapping joints of concrete-filled walls are deemed to be waterproofed if installed correctly by an accredited installer.
The permanent polymer encapsulation of concrete claims to prevent water ingress, thus eliminating the root cause of corrosion of reinforcing steel caused by moisture absorption. One of the goals of SIP formwork is to seal and protect the concrete from the environment for the life of the building. However, appropriate waterproofing of the floor to wall joints is required to ensure watertightness.
Can panel joints in concrete walls constructed with polymer-based modular permanent formwork leak?
In the case of a high water table behind multi-story underground basement walls, where the hydrostatic pressure is strong, there is a potential for panel joints bending, which can create a passageway for water ingress. The possibility of damage to the panel joints or corner joints can occur during construction and may also be a cause to water ingress.
Singapore Waterproofing has been engaged on multiple sites in Sydney and in the NSW area and we have successfully rectified problems with water seeping through permanent formwork systems from the positive side of the permanent polymer-based modular concrete wall, seeping through the concrete and exiting through the joint on the negative/reverse side of the wall.
We recommend waterproofing basements no matter which formwork system you choose to use with an appropriate waterproofing system that is suitable for PVC formwork and application.
The photo below shows leaking panel joints. This concrete wall in Sydney is constructed with polymer-based modular permanent formwork system for concrete walls.
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 a week. If you have any issues with moisture, seepage 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.
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