When we have a decent amount of rainfall, there are many buildings experiencing water ingress. Rooftops, basements, lift pits and underground car parks are particularly vulnerable during and after heavy rainfall or prolonged periods of rain.
When the soil gets saturated with rainwater, cold joints, floor/wall joints, cracks in concrete and masonry basement walls or floors can turn into active water leaks.
The hydrostatic pressure from the rising water table and the lateral pressure from saturated soil are pushing the excess water into basement slabs, foundations and retaining walls making them susceptible to water ingress through cracks, porous building materials, holes, joints and/or inadequate waterproofing.
Some common signs of water ingress:
Mould or damp patches are not always visible and you may have hidden mould or damp if:
This room (pictured) is situated in a partially below ground area of the house and our client had identified that they were experiencing water ingress in some areas of the room. Our Waterproofing Singapore inspector observed that there were signs of water ingress through the floor/wall joint and the walls.
The leak sealing process, or polyurethane injection, involves the high-pressure injection of flexible water-reactive polyurethane (resin) into targeted areas to form a durable seal. This system is ideal where a long-lasting waterproof seal is required to stop the passage of water or other liquids through gaps, cracks, joints, and penetrations – typically in concrete and masonry constructions.
It is a highly specialised process, requiring the skills of experienced operators. At Singapore Waterproofing our technicians perform polyurethane injection works frequently. They receive ongoing training from industry leaders which equips our technicians with expert skills and knowledge.
We use the best Polyurethane (PU) product available as our primary injection resin. This resin offers superior performance. Its main features include permanent flexibility; very low shrinkage; water potable; low viscosity; and a hydrophilic reaction – it is the same product that is pre-approved by major traffic authorities around the world for major infrastructure assets.
This system can be installed in any weather – in fact, the wetter the better, as it reacts with water right before your eyes. In dry weather, flooding the source of water entry (where possible) may have a similar effect.
Singapore Waterproofing’ proprietary injection system exceeds the highest injection process and safety standards in Australia and internationally throughout Europe and the USA.
We continually review and reassess the method, always striving to hone and improve our systems. Our proprietary leak sealing system forms a long-lasting flexible seal against water ingress which also withstands normal building movement between construction elements and details.
Our waterproof membrane (NSM 100+) is a two-component acrylic modified cementitious coating that is flexible so that it can handle a small amount of movement.
This membrane is a hardwearing, seamless waterproofing membrane for effective concrete protection. It also provides an effective barrier to waterborne salts and atmospheric gases.
The NSM 100+ system is breathable. Whilst repelling water, it allows moisture to pass through it slowly as a vapour, allowing the substrate to breathe.
It is water-based, so any vapours are non-toxic and ideal for potable water usage and it can be painted over in water-based breathable paints (e.g. low sheen or matt acrylics) and most water-based after-trades such as direct stick, tiles or render.
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