Premankur Bhattacharya (TECHNICAL HEAD)
premankur@aquacrete.co.in
Visit us : www.aquacrete.co.in
ANN WORLD (ISO 9001:2015 CERTIFIED) ,3 YOGIPARA BYE LANE , Manicktalla,
KOLKATA-700006 , W.B.
CONSTRUCTION CHEMICAL MANUFACTURING COMPANY SINCE 1993

This is a mandatory job in waterproofing to protect roof from leakage, seepage and heat. There are various methods and unique techniques are approved by many consultants, developers and others. We will study all methods.

1) Old method which is now obsolete – LIME SURKI roof waterproofing.

Advantages- Very good waterproofing property.

Very good heat insulation property.

Durable.

2) Soil pot system – This system is very effective to replace the above system.

Advantages- Very good waterproofing property.

Very good heat insulation property.

Durable.

Soil pots are immersed in AQUACRETE® for 2-3 hours. Then those are placed on AQUACRETE® admixed R.C.C. roof as conical shape will be upward. The gaps of pots are covered during screed concreting; screed concrete must be prepared with SYLOCON® and should be laid in panels. Panel joints are filled up with AQUACRETE® FLEXEEL, a highly elastomeric waterproof and weather proof sealant.

Advantages- Very good waterproofing property.

Very good heat insulation property.

Durable.

Disadvantage- Collecting soil pots is important. Soil pots are fragile items. Care should be taken to handle soil pots to avoid damage.

 

3) Cement and fillers with polymer coating- cementitious slurry is prepared which is applied on R.C.C. roof slab and is covered by a layer of screed concrete.

Advantages- Ease of working.

Economical.

Disadvantages- When screed concrete is cracked, underneath treatment is also slowly damaged and holds water in concrete pockets. During hot season entrapped water is evaporated which causes further development of cracks in screed concrete and underneath treatment is damaged due to this random crack development in screed concrete. This system is not found durable and repairing job is the only solution of this problem which is a just temporary solution.

4)Scratch resistant white acrylic coating on top of screed concrete-

Advantages- Reflects heat.

Good waterproofing membrane.

Durable.

Disadvantages- Reflects heat till white colour is not affected by dirt or dust.

A warranty period is provided by manufacturer or applicator which means it has certain longetivity.

Very costly.

Skilled workmanship is required.

5)Any type of membrane waterproofing-

Advantages- Very good waterproofing property.

Very good heat insulation property.

Durable.

Soil pots are immersed in AQUACRETE® for 2-3 hours. Then those are placed on AQUACRETE® admixed R.C.C. roof as conical shape will be upward. The gaps of pots are covered during screed concreting; screed concrete must be prepared with SYLOCON® and should be laid in panels. Panel joints are filled up with AQUACRETE® FLEXEEL, a highly elastomeric waterproof and weather proof sealant.

Advantages- Very good waterproofing property.

Very good heat insulation property.

Durable.

Disadvantage- Collecting soil pots is important. Soil pots are fragile items. Care should be taken to handle soil pots to avoid damage.

 

6)Cement and fillers with polymer coating- cementitious slurry is prepared which is applied on R.C.C. roof slab and is covered by a layer of screed concrete.

Advantages- Ease of working.

Economical.

Disadvantages- When screed concrete is cracked, underneath treatment is also slowly damaged and holds water in concrete pockets. During hot season entrapped water is evaporated which causes further development of cracks in screed concrete and underneath treatment is damaged due to this random crack development in screed concrete. This system is not found durable and repairing job is the only solution of this problem which is a just temporary solution.

7)Scratch resistant white acrylic coating on top of screed concrete

Advantages- Reflects heat.

Good waterproofing membrane.

Durable.

Disadvantages- Reflects heat till white colour is not affected by dirt or dust.

A warranty period is provided by manufacturer or applicator which means it has certain longetivity.

Very costly.

Skilled workmanship is required.

8)Any type of membrane waterproofing-

 

Here bricks are laid as an insulting component on mother R.C.C. slab.

In most cases mother R.C.C. slab is coated with waterproof coating.

Bricks are covered with screed concrete or tiles are laid on top of screed concrete.

Advantages- Good thermal insulation property. Due to application of waterproof coating on mother slab, waterproofing property lasts till the top surface does not allow water infiltration.

Disadvantages- Increases maximum dead load on roof slab.

Once top surface allows water infiltration, water is entrapped inside pockets and bricks are wet. As a result, dead load is further increased. Water percolation starts from bricks to underneath waterproof coating. Waterproof cementitious coating starts swelling and slowly damage is found causes leakage. Further entrapped water evaporates forming gas which generates upward pressure and liberates creating new cracks or gaps on top.

9)An unique technique of roof waterproofing

Mother R.C.C. slab is made with AQUACRETE®, which is a liquid nano waterproofing compound, when reaction takes place between calcium silicates, this creates a water repellent hydrophobic concrete. This helps in self curing too. So, no cracks are developed in concrete. Once mother slab concrete is waterproof, there is no chance of water percolation through the AQUACRETE® admixed concrete.

Top of the slab is covered to drain out water; a screed concrete is laid in panels. SYLOCON® is added in screed concrete to avoid cracks in screed concrete and providing a waterproof protection on roof. SYLOCON® also helps screed concrete in curing.

Panel joints are filled up with AQUACRETE® FLEXEEL, a highly elastomeric waterproof and weather proof sealant.

Advantages- A monolithic waterproof roof is made. No additional waterproof coating is required. Screed concrete is not cracked due to this specification.

Disadvantages- Proper mixing of AQUACRETE® and SYLOCON® with concrete is very important.

10)Roof garden-

This is a costly method of roof treatment which is not only attractive and environment friendly, but it has a very good insulation property.
Disadvantage- If waterproofing is not perfect and expansion joint ( for large area) is not treated properly with right product and concept, there is a common chance of failure, This is proven in many projects.