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waterproofing-230304122845-d4a2b878.pptx
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- 2. Introduction Water proofing Protection toprevent water entering in internal and external building structures like toilets, swimming pools, water tanks, retaining walls, roofs etc. Damp proofing Treatment to a surface to resist the passage of water in areas like foundations, exterior walls, metal surfaces, metal staircases etc.
- 3. Common Water Damageproblems •Corrosion of steel reinforcement in concrete • Blistering of paint • Dampness on walls, roofs & Floors • Leakage in water tanks
- 5. Benefits of Waterproofing •Increased durability of concrete structures • Reduce chemical attack • Cost reduction in maintenance • Prevents growth of dangerous mold
- 6. Water proofing mayalso be done after a building is built ,to address problems as they emerge or as part of a building retrofit. Water proofing is done in various parts of the building which include • WC • Bathrooms • Terrace • Roofs and chajjas • Basement • Swimming pools • Underground ducts • Underground and over head water tanks Water proofing maintains the appearance of the building and increases the life of the structure
- 7. How Water canpenetrate Concrete Strctures?
- 8. Why Waterpoofing isImportant • When we refer back to the definition of waterproofing as a barrier to prevent water entering or escaping from structure, then the real importance is reflected in the consequences of not waterproofing.
- 9. What could happenif a building isn’t waterproof ? • Poor waterproofing brings serious risk to the integrity of a building. • When exposed to water ,foundation cracks or joints may lead to bigger structural problems. These are, Leakage ,Spalling ,Deterioration • If the building is made up of wood or has wood furnishings the moisture from water intrusion will cause wood to rot or delaminate. • Mould spores also pose hazards. Exposure to these may lead to allergies, asthma, irritations and fungal infection.
- 10. Importance of waterproofingin building • Building regulations Local building codes strictly assert waterproof as one of the important requirements in any high- rise building works. eg:- Sydney waterproofing contractors follow these guidelines to ensure a safe and sustainable application. • Risk prevention Preventive risk management of any structure, it is important to waterproofing solutions to assets have the right as well as its occupants. If not done correctly, it can result damage to the property, valuable and health risk to people.
- 11. Important of waterproofingin buildings cont. • Prevent unnecessary cost It is wiser to invest in preventive risk measures than to pay for damage repairs. Any building requires regular maintenance to protect it from damage caused by water, roof waterproofing is an effective preventive measure.
- 12. Waterproofing Methods • CementitiousWaterproofing • Liquid Waterproofing Membrane • Bituminous Membrane • Bituminous Coating • Polyurethane Liquid Membrane
- 13. 1. Cementitious Waterproofing •Cementitious waterproofing is the easiest method of waterproofing in construction. The materials for cementitious waterproofing are readily available from suppliers of masonry products. And they are easy to mix and apply. • The applications of the cementitious waterproofing technique are in the internal wet areas, such as toilets. That is why it does not go through the contract and expansion process.
- 14. Cementitions Waterproofing a. Materials– Masonry products b. This method is often used in the internal wet area. • Toilets • Laundries • Kitchens • Entries • This methods semi-flexible or rigid. • Its not exposed to sunlight and weathering.
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- 16. Applications of Cementitious Waterproofing •Water treatment plants • Sewage treatment facilities • Bridges • Dams • Railway and subway systems • Marine cargo ports and docks • River locks/channels • Parking structures • Tunnels
- 17. 2. Liquid WaterproofingMembrane • The liquid membrane consists of a primer coat and two topcoats. The application of the coatings is by spray, roller, or trowel. The liquid layer is thin and offers more flexibility than the cementitious types of waterproofing. • The liquid cures into a rubbery coating on the wall. The elongation properties of the coat can reach as high as 280%. The durability of the waterproofing coating depends on what type of polymer the manufacturer used for the making of the liquid waterproofing.
- 18. Liquid Waterproofing Membrane cont. Liquidwaterproofing membrane can be of a spray-applied liquid layer composed of polymer-modified asphalt. Polyurethane liquid membranes in separate grades for trowel, roller, or spray are also available from various manufacturers.
- 19. Liquid Waterproofing Membrane cont. Equipmentused for coatings- • Spray • Roller • trowel • Which may be aqueous solution or gas mixture. • Liquid membrane should be immiscible with water. • Low vapor pressure. • This methods more flexible.
- 20. Advantage • A liquidwaterproofing membrane is essential for protecting many building structures. These flexible membranes are hand or spray applied onto surfaces such as balconies, podium decks and green roofs. They are even used to line municipal water tanks to prevent leaks.
- 21. Cont. Liquid Waterproofing Membraneis used in the following type of structures: • Balconies • Podium decks • Green roofs • Water tank
- 22. 3.Bituminous Coating Waterproofing •Bituminous coating (asphalt coating) is made of bitumen based materials. It is a flexible protective coat based on its formulation and polymerization grade. The flexibility and protection against water can be influenced by the polymer grade and reinforcement of fiber. • The most common applications of bituminous coatings include areas that are beneath screed wet. It is an excellent protective coating and waterproofing agent, especially on surfaces such as concrete foundations. • It is not suitable for exposure to sunlight unless it is modified with a more flexible material such as polyurethane or acrylic-based polymers.
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- 24. Bituminous Coating cont. •Bituminous Coating is also called as asphalt coating. • This methods commonly use beneath screed wet area. • It is an excellent waterproofing methods for a concrete foundation. • It is made of bitumen based materials. • Should not expose to sunlight. • Exposure to the sunlight can be unstable and fragile.
- 25. 4. Bituminous Membrane Waterproofing •Bituminous membrane waterproofing is a popular method used for low-sloped roofs due to their proven performance. The bituminous waterproofing membrane has a torch on the layer and self-adhesive membrane. • Self-adhesive compounds comprise asphalt, polymers, and filler; additionally, certain resins and oils may be added to improve adhesion characteristics. The self-adhesive type has a low shelf life as bonding properties of the membrane reduces with time. • Torch on membrane has exposed and covered types. The exposed layer often has granular mineral aggregate to withstand the wear and tear of the weathering. For the other kind of membrane, the contractor needs to apply one protective screed to prevent the puncture of the membrane.
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- 27. Bituminous Membrane cont. •Its popular method used for low-sloped roofs. • Bituminous waterproofing membrane have torch on membrane and self-adhesive membrane. • Self-adhesive compounds- • comprise asphalt • Polymers • Filler • Certain resins and oils may be added to improve adhesion characteristics.
- 28. 5. Polyurethane LiquidMembrane Waterproofing • Polyurethane liquid membrane method of waterproofing is used for the flat roof area and exposed to weathering. This waterproofing method is expensive.
- 29. Polyurethane Liquid Membrane Waterproofingcont. Polyurethane Liquid Membrane can offer higher flexibility. Polyurethane is very sensitive to moisture content. Therefore before application, one has to be very careful evaluating the moisture content of the concrete slab, otherwise peeling or de-bonding of membranes may happen after some time
- 30. Polyurethane Liquid Waterproofing Membrane Equipmentused for coatings- • Spray • Roller • trowel • Which may be aqueous solution or gas mixture. • Liquid membrane should be immiscible with water. • Low vapor pressure. • This methods more flexible.
- 31. Advantages of Polyurethaneliquid waterproofing membranes • No significant load increase on lightweight decks and roofs. • UV resistant, no coat protection required. • Easy to repair, even locally. long term maintenance is quick and low cost
- 32. Liquid Waterproofing Membraneis used in the following type of structures: • Balconies • Podium decks • Green roofs • Water tank
- 33. Problem solution forwaterproofing Waterproofing • Waterproofing is the best preventative measure to take against concrete cancer • Reducing the life of the building • Use Wolfing or cosmofin • Cracking the walls of the building • Damage to household goods There are five commen water proofing issues 1. Isuus from above 2. Incorrect water proofing 3. Balconies 4. Windows 5. Ignoring the need for maintenance
- 34. What is concretecancer? • When buildings are constructed, concrete is reinforced with bars or mesh made of steel. After being exposed to air and water, however, this steel corrodes, forcing it to expand, and the surrounding concrete to crack. The cracking, known as spalling, undermines the strength of the building What are the signs? Most structural enginers will be able to spot concrete cancer before you can. However, they’re not always on hand, so it pays to know the tell-tale signs that it may be time to get in the experts. • 1. Cracking or crumbling concrete • 2. Rust stains that seem to come out from the concrete • 3. The concrete render starts to bubble • 4. Roof leaks or any that appear in internal walls
- 35. Six Common causeof concrete cancer include • Poor waterproofing • Salt-water chlorides for buildings near the sea • Building defects • Weather • Poor quality concrete and insufficient concrete cover • Movement of the earth under the build leading to cracks Inspect your roof regularly • The roof must be regularly inspected • Experts recommend that a commercial roof be inspected at least twice a year. • When inspecting, drainage and any roof elements that may enter the building should be inspected. • If there are any water stains, they should be thoroughly examined as cracks.
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