Waterproofing is one of the most important components of construction in both residential and commercial projects. It protects buildings from water entering, structural damage, mold growth, and interior deterioration. Below shows an overview of various waterproofing methods using industry-grade products.
Waterproofing Roofs Due to Water Leakage Through the Roof
Waterproofing Roofs Using Polyurethane and Acrylic Membranes is recommended as roofs are very susceptible to water penetration due to constant exposure to environmental elements like rainfall, UV radiation, and temperature changes. Materials chosen to waterproof are more durable and flexible to accommodate structural movements and long-term wear.
To waterproof an exposed roof, start by thoroughly cleaning the surface to remove dust, oil, and dirt. Any cracks or defects should be fixed before the surface is primed with a compatible primer, the first coat of membrane should be applied using a roller at the recommended thickness. For enhanced strength in weak joints or transitions, a fiberglass mesh should be added into the wet membrane. After the initial coat cures, a second coat should be applied similarly to the first. The membrane must be left to dry completely for 48–72 hours before being exposed to using.
For under-tile applications on sloped roofs or terraces, the area must be clean and smooth, and an acrylic primer should be applied beforehand. The membrane is applied in two coats with mesh placed at corners and joints. The second coat is applied after the first has dried. The membrane should be allowed to dry thoroughly before laying screed or tiles.
Waterproofing Toilets Due to Water Leakage In Bathroom
Toilets, Bathrooms, and Wet Areas are constantly exposed to water and moisture, making them highly likely to encounter leakage and dampness. To prevent issues such as water seepage, tile detachment, mold growth, and structural damage to adjacent rooms, it must be properly waterproofed.
The will start with surface preparation—cleaning, leveling, and patching cracks or gaps. After priming the area, the primary membrane, is applied and critical areas such as corners, wall-to-floor junctions, and pipe penetrations are reinforced with fiberglass mesh or tape.
Once the first coat has dried, a second coat is applied onto the first. The membrane should be extended at least 150mm up the wall and rise 50mm above any curbs. It is important to allow full curing before tiling or screeding over the waterproofing layer.
Waterproofing Internal and External Walls
Water leakages through walls, whether from rain or condensation, can lead to major issues such as efflorescence, damp patches, and peeling paints. Proper waterproofing for both internal and external walls is important to ensure structural integrity and long-term appearance.
For internal basement or retaining walls made of concrete or masonry, cementitious waterproofing is more effective. The walls must be thoroughly cleaned and dampened before application. The first coat is applied on the area, followed by a second coat onto the first once the surface has dried.
External decorative surfaces like brick, stone, or fair-faced concrete can be waterproofed. This transparent, breathable water repellent is applied using a brush, roller, or spray. It provides protection without changing the visual appearance of the substrate and can be applied with multiple coats for enhanced durability.
For wet internal walls in areas like showers and kitchens, we will start with priming, after which two coats of membrane are applied with fiberglass reinforcement in corners and along junctions. Once it dries, the walls are ready for tiling or finishing.
3 Types of Water Leakage Repair via PU Injection, Silicone and PU Sealant
Leakage Repair with PU Injection
Cracks in concrete structures caused by shrinkage, movement, or foundation settling can cause serious leakage problems. Polyurethane (PU) injection is an effective method for sealing active leaks by filling cracks from the inside out.
The repair begins with determining the crack path and drilling holes at intervals of 200 to 300 millimeters, angled to surround the crack. Mechanical packers are inserted into the drilled holes, and a PU injection resin is pumped in under high pressure. This resin reacts with moisture, expands, and fills the crack completely, forming a watertight seal. Once the resin has dried, the packers are removed, and the holes are patched with epoxy or cementitious filler. This technique is commonly used in concrete joints.
Some benefits of PU injection will include targeting micro crack lines using high pressure system to infiltrate the affected area and thus solving the leakage issues. When the polyurethane is exposed to moisture or water it will expand thus blocking the water from entering the area. It will also be a cost effective method as compared to tearing down or hacking the affected area for waterproofing.
Waterproofing Windows Using Silicone and PU Sealants
Windows are usual sources of leakage due to improper sealing or aging materials. Water can penetrate through gaps between window frames and surrounding walls, especially during heavy rains or wind-driven moisture. Ensuring these joints are well-sealed is important for preventing water ingress.
To waterproof window joints, old or failed sealants must first be removed, and the area should be cleaned of any dust or debris. Either neutral-cure silicone or PU sealant is applied using a caulking gun, depending on the materials involved—silicone for glass and metal, PU for masonry. The sealant is then tooled to ensure proper adhesion and finish. Full curing typically takes at least 24 hours, during which time the joints should be protected from water exposure.
SWC Construction deals with all sorts of leakage and waterproofing maintenance from waterproofing roofs, toilets and kitchen, internal and external walls and using Polyurethane to solve water leakage issues from the windows and weak concrete joints all around the house. SWC also uses cutting edge technology and equipment, experimenting with the multiple chemical solutions to determine which will be the best fit for any waterproofing or leakage issues.
