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WATERPROOFING - EXTERNAL WALLS OF BUILDINGS
Sunanda Global
Water discharge or additional unconditionally wet ingress in buildings results in damp, uncomfortable internal environments; deterioration of internal finishes (including mould growth); unpleasant damp areas on wall and ceiling surfaces and multiplied concentrations of harmful pollutants moving occupant's health. The exclusion of wet from buildings is thus not solely fascinating however conjointly AN utmost concern to the residents of the buildings.
Water seepage through external walls
In Mumbai, because of a significant downfall, water flowing through external walls is found to be a standard defect faced by the householders.
In general, watercourse through external walls at intervals the primary 5 years of building completion. the matter is additionally combined by Mumbai's high wetness and copious downfall. the current of airspeeds intimate with high rise buildings additionally increases the chance of water oozing. Building envelopes should, therefore, be adequately designed and made to stop the ingress of water.
General reasons for water seepage through external walls:
1.Joints and cracks in the walls
2.Absorption and permeation of the materials
3.Construction joints in the walls
4.Penetrating dampness
5.Rising dampness due to capillary action
6.Poor construction practices
7.Honeycomb structures in concrete or plaster.
8.Separation gaps
Waterproofing Systems & Materials
Water tightness of external walls is typically achieved by providing adequate wall thickness, correct coming up with at construction joints and surface rendering and finishes that function barrier against water ingress. Generally, no consideration is paid towards significant regions like partition holes, honeycomb zones, sodden verification courses at the platform level, etc. This results in serious leakages through external walls and damages to high-priced internal paints & finishing.
Significance of external wall coating
Use of SUNANDA Polyalk WP and SUNANDA Polyfill AR.
SUNANDA, Polyalk WP waterproofing coating can be applied on all types of exterior concrete surfaces.
Features and Benefits of POLYALK WP :
Confirms to I.S. 101
Tested as per DIN 1048 for permeability
High flexural strength and extraordinary adhesion
Alkaline and compatible with concrete
Prevents carbonation
Can be used as a base waterproofing coat
Features and Benefits of POLYFILL AR :
Crack filler for plasters, IPS, cement sand screeds, and non-structural cracks
No need to OPEN the crack - due to auto suction property of POLYFILL AR
4 best simple steps to waterproofing external wall
About SUNANDA -
Today, SUNANDA is the main development synthetic substances organization in India to have an ISO 9001:2015 accreditation for innovative work, therefore we have the interesting capacity to tailor-make explicit frameworks for more current issues that happen nearby.
Out of all of the production chemical compounds businesses in India, we've received the best award in India for the beyond three years 'Innovator of the Year Award 2012, 2013, and 2015' instituted via way of means of FICCI & Department of Chemicals, Govt. of India withinside the presence of Shri. Narendra Modi, Prime Minister of India.
In the month of March, we have won the award for best waterproofing material producer from Expert Choice.
WATERPROOFING FOR HEALTHY STRUCTURES | BY SUNANDA GLOBAL (PART 1)
Dr. S. K. Manjrekar
Waterproofing Practices - An Introduction
“No material is itself durable or non-durable, it is the interaction of the material with its in-service environment that determines its durability” - says a well-known concrete technologist Larry Masters. Thus, with reference to concrete, durability will depend on the nature of the concrete (and that means impermeability) and the aggressiveness of the in-service environment. The three important steps that ensure adequate durability of concrete in-service are:
Compliance with current standards of good practice during construction.
The use of new and improved materials and innovative construction systems designed for increased durability at competitive costs.
Provision of protection to existing undamaged structure against adverse environments.
However, in spite of all the precautions, there are several other factors which can affect the durability of concrete. Though, innumerable to list out, these factors can be mainly grouped under four principle categories viz:
Construction practices,
Design,
Material characteristics, and
Exposure conditions.
The appropriate knowledge or lack of the same regarding these four categories leads to distress and defects in the concrete structures and that is often the initiation point of the deterioration in the health of the concrete structure. In the Indian context, these four parameters have caused havoc in the alter part of the century, and thus, it becomes our paramount responsibility to introspect, evaluate and rectify the blunders and march confidently towards the future with healthy waterproof structures.
The defects and the distress in the structures are manifested in several ways but generally observed manifestations are the dampness and leakages. Needless to say, though there are several independent reasons for leakages in the structures, the well thought-out methods to waterproof a structure can give long lasting rewards. Thus, it is a well identified aspect of durability to offer good waterproofing to a structure.
To bring out various near-perfect methods of waterproofing based on the latest developments in the world of material science.
Click below to read the next part of the article.
Waterproofing of the structure
About the author
Dr. S. K. Manjrekar (Ph.D. Bombay University - 1977), Dr. S. K. Manjrekar is Chairman and Managing Director of a well-known construction chemicals company in India - M/s. Sunanda Speciality Coatings Pvt. Ltd.,for last 40 years. Operations in UAE, Oman, Nepal, Tanzania and USA.
He is actively working on several technical and administrative committees of American Concrete Institute (ACI) in USA.
He teaches concrete field testing course of ACI to engineers of India as a ‘Train the Trainer’ initiative.
He has published more than 200 papers in various national and international journals.
He has given more than 100 key note lectures in the field of Concrete, Corrosion Prevention, Waterproofing and Nano materials etc.
Lectured extensively internationally in Countries - United Kingdom - London, Leeds University, United States of America - Pittsburgh, Malaysia, Oman, Dubai, Sharjah, Kuwait, Romania, Hong Kong – Hong Kong University and many more as an invited keynote speaker.
He is the guest editor of International journals in UK, USA and Mexico.
WATERPROOFING OF THE STRUCTURES | BY SUNANDA GLOBAL (PART 2)
Dr. S. K. Manjrekar.
Modern day structures are indeed more complicated than the earlier ones, which were constructed, say 20-25 years ago. Earlier, a mere conventional waterproofing treatment of terrace, toilet, bath, sinks and an old basement needed the waterproofing job. However, these days the structures are high-rise, they have large podium, car-parking lots, basements, terrace garden at each duplex flat level, corporate office gardens, flowerbeds, swimming pools at various levels, narrow ducts (chowks) for plumbing lines and electrical lines besides conventional problems of regular large terraces. Due to unusually large heights of the structures, ensuring the quality plastering on the external surface also poses a problem, which adds to the difficulties in waterproofing. If the problems of such large structures are left unattended and uncared for at the execution stage, then the rectification becomes near impossible job adding astronomically to the cost of maintenance. Besides in several large structures like hotels or large commercial premises proper sunks are not provided in toilet and bath blocks. This creates problems while adjusting the arrangement of plumbing and other toilet lines. Sometimes even slabs are to be perforated both as an afterthought or the part of planning which can become a potential source of leakage if not handled with proper understanding of materials.
In above cited cases each waterproofing problem becomes a unique case study and needs to be addressed separately. Obviously a thorough study and absolute expertise in the field only can give a proper solution. Most of the times an additional safety measure in the course of waterproofing can help a long way to offer the relief. Looking at the very high cost per square foot of construction today and still higher costs for rectification (in case anything goes wrong) it is very wise to take a safety measure which can ensure a total waterproofing.
From economic point of view also when spread over entire cost of project per square foot which is say for example approx. Rs.1000/- per sq.ft, then the cost of this additional safety does not come to even 2 per cent. If you add the cost of interiors to the basic cost of the structures then possibly this additional cost will be further lowered down to 1 or 1.25 per cent. Further, as the number of floors increase, as is the generalised case these days, the cost per square foot is brought down to almost negligible percentage.
It is interesting and important to note that the ineffective waterproofing not only destroys the structure but also does not spare the more valuable interior decorations, which ironically is thought to be of more importance by public. Thus, wise is the builder/ constructor who acknowledges and implements the effective safety measures for waterproofing right at the conceptual stage.
Click below to read the next part of the article.
About the author
Dr. S. K. Manjrekar (Ph.D. Bombay University - 1977), Dr. S. K. Manjrekar is Chairman and Managing Director of a well-known construction chemicals company in India - M/s. Sunanda Speciality Coatings Pvt. Ltd.,for last 40 years. Operations in UAE, Oman, Nepal, Tanzania and USA.
He is actively working on several technical and administrative committees of American Concrete Institute (ACI) in USA.
He teaches concrete field testing course of ACI to engineers of India as a ‘Train the Trainer’ initiative.
He has published more than 200 papers in various national and international journals.
He has given more than 100 key note lectures in the field of Concrete, Corrosion Prevention, Waterproofing and Nano materials etc.
Lectured extensively internationally in Countries - United Kingdom - London, Leeds University, United States of America - Pittsburgh, Malaysia, Oman, Dubai, Sharjah, Kuwait, Romania, Hong Kong – Hong Kong University and many more as an invited keynote speaker.
He is the guest editor of International journals in UK, USA and Mexico.