We often ignore few important things in our daily life and think these are only for Professionals. Like water proofing. Many of us in our lifetimes find opportunity to build our own houses, industry or office but few of us know the importance of water proofing and result is obvious. We come across issues like seepage and it redo things which cost more money, time and causes lot of irritation.
Water proofing is very simple term;
Waterproofing is the process of making an object or structure waterproof or water-resistant, so that it remains relatively unaffected by water or resisting the ingress of water under specified conditions. Such items may be used in wet environments or under water to specified depths.
There are some common types of waterproofing methods used in construction industry.
Waterproofing in buildings / structures are generally required for:
· Basement of structure
· Bathrooms and kitchen
· Balconies, decks
· Terrace or roofs
· Green roofs
· Water tanks
· Swimming pools
The following waterproofing methods are commonly used in construction:
· Cementations Waterproofing
· Liquid Waterproofing Membrane
· Bituminous Membrane
· Bituminous Coating
· Polyurethane Liquid Membrane
Applications of Cementations Waterproofing:
Cementations waterproofing is used in the following type of structures:
· Water Treatment Plants
· Sewage Treatment Plants
· Railway & Subway Systems
· Marine Cargo Ports & Docks
· River Locks/Channels & Concrete Dykes
· Parking Structures & Lots
Liquid Waterproofing Membrane Method:
Liquid membrane is a thin coating which consists of usually a primer coat and two coats of top coats which are applied by spray, roller, or trowel. It offers more flexibility than the cementations types of waterproofing. The liquid cures into a rubbery coating on the wall. The elongation properties of the coating can reach as high as 280%. The durability of the waterproofing coating depends on what type of polymer the manufacturer use for the making of the liquid waterproofing.
Liquid waterproofing membrane can be of spray-applied liquid membrane composed of polymer-modified asphalt. Polyurethane liquid membranes in separate grades for trowel, roller, or spray are also available from various manufacturers.
Bituminous Coating Waterproofing Method:
Bituminous coating is a type of coating used for waterproofing and flexible protective coat in accordance with its formulation and polymerization grade. Its flexibility and protection against water can be influenced by the polymer grade as well as reinforcement of fiber.
Bituminous coating is also called as asphalt coating. 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. Bituminous coating is made of bitumen based materials and it is not suitable for expose to sunlight. It becomes very brittle and fragile when long exposure to the sunlight unless it is modified with more flexible material such as polyurethane or acrylic based polymers. The flexibility of the finished products always depends on the solid content of the polymer added to the bitumen.
Bituminous Membrane Waterproofing Method:
Bituminous membrane waterproofing is a popular method used for low-sloped roofs due to their proven performance. Bituminous waterproofing membrane have torch on membrane 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 low shelf life as bonding properties of the membrane reduces with time.
Torch on membrane have exposed and covered types. Exposed membrane often has mineral granular aggregate to withstand the wear and tear of the weathering and the other types of membrane, contractor need to apply one protective screed to prevent the puncture of the membrane.
Bituminous Membrane Waterproofing Method:
Polyurethane Liquid Membrane Waterproofing Method:
Polyurethane liquid membrane method of waterproofing is used for the flat roof area and exposed to weathering. This waterproofing method is expensive.
Polyurethane Liquid Membrane Waterproofing Method
Polyurethane Liquid Membrane can offer higher flexibility. Polyurethane is very sensitive to moisture content present, 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.
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