All about Waterproofing By B S Ranganath 7/25/2019

Introduction Waterproofing is a process enabling terraces, balconies, water closets, sunshades, sump tanks, overhead tanks etc. to be water-tight in buildings. Waterproofing could be carried out on surfaces of masonry, concrete, cement render, timber etc. This presentation imparts knowledge in brief about various types of waterproofing, to the aspirants . 7/25/2019

Picture 1: Latest application in progress 7/25/2019

Importance of Waterproofing Penetration of water into buildings because of porosity and cracks has proven to be one of the most destructive elements affecting stability and durability. Effective steps are taken at the pre and post construction stages to incorporate waterproofing and cut down maintenance costs, thereby providing comfort to the occupants of the building. 7/25/2019

Importance of Waterproofing Following damages caused due to seepage of water result in the building decay and deterioration. 1) Rotting of timber structures and finishes such as floors, skirting, architraves and frames. 2) Corrosion of materials such as mild steel round and deformed bars in concrete, metal door frames etc. 3) Swelling of the backing coat of plaster and the subsequent de-bonding of ceramic tiles. 7/25/2019

Importance of Waterproofing 4) Electrical hazards causing short circuit of lighting and power points. 5) The blistering of paint. The importance of waterproofing can not be overlooked. Damage caused to the building's structure, coupled with the high cost to be incurred on rectification warrants a careful design and application of waterproofing. 7/25/2019

Closely followed Applications Waterproofing has various approaches depending on usage of certain film, membrane, cementatious layer or stone layer. Some of the known applications are as follows. Tar felting for terraces Brickbat Coba for terraces Metal Coba for sunken slabs Box type waterproofing Cement Grouting and Chemical Coating Integral waterproofing 7/25/2019

Application of Tar Felt Tar felting is the oldest in practice. It has layers of tar held together with a variety of reinforcements. It prevents cracking to provide impermeable layer between water and the surface to be protected. It is categorized as three, five or seven layer treatment. Seven coat application is recommended for new jobs but seldom executed, since it costs as much as the other technically more advanced treatments. Though once universally used, it is found to be inadequate even for terrace waterproofing, for which it is primarily designed. 7/25/2019

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