Wednesday, July 6th, 2022

Thermal Insulation Of Top Roof (R.C.C. Slab) And Durable Waterproofing

Premankur Bhattacharya
Technical Head,

SYLOCON® has made a specification to keep your top floor cool. Many insulating materials in modern technology and SYLOCON have made the most effective insulation, which is natural and building-friendly. The methodology is made following the LAW OF THERMODYNAMICS.

We are aware of the importance of insulation since the prehistoric period. Then, animal skin was used as a thermal insulating material. Fur and plant materials like flax, reed soil, and straw minimize the heat ingression as they can hold a large amount of air between molecules that create an air cavity to reduce heat exchange. But in the later stages, people realized that the organic material could not exist for a longer period. Since that time, people have started hunting for alternative durable components for more effective thermal insulation. At the beginning of the 19th century, people noticed the disadvantage of natural materials due to their degradation. Since then, people’s attention was towards artificial components for durable thermal insulation like rock wool, fibreglass, foam glass, and hollow bricks.

The Importance Of Thermal Insulation

Thermal insulation is an essential factor in buildings. Sufficient thermal insulation is a fundamental task that ensures a healthy indoor environment and protects against structural damages. It is also a reason for dealing with high energy consumption. Good insulation can reduce the heat flow through the building envelope. Good thermal insulation can also bring the following benefits to the building:

  1. That prevents building damage due to the moisture formation on the inside of the building envelope. Good thermal insulation never allows temperature to fall inside the room surface below a critical level. Hence, condensation and mould formation is avoided. 
  2. Good thermal insulation offers a comfortable and healthy living.
  3. Insulation reduces unwanted heating or cooling energy input and reduces the heat exchange through the building envelope,

Solar radiation is a vital source in making the buildings hot in summer and cool in winter. It is noticed that 80 per cent of the heat comes from the rooftop through the R.C.C. slab. Due to the heat flow from top, the air temperature inside the room is raised.

Air gaps have a thermal resistance to heat flow. This is denoted by R.  R-value, in terms of insulation, refers to the thermal resistance of a different type of materials. The higher R-value shows better insulation. It depends on the type of material, thickness, and density. The above technical properties have helped to fix a specification of best insulation with SYLOCON®.

A Modified Traditional Specification Of Thermal Insulation Of Roof Using Sylocon®.

  1. Hollow burnt clay pot is selected for thermal insulation. The clay was chosen because of its low conductivity of heat and porosity. It is very cheap and abundantly available. The outer surface of the pot is designed in a pattern of the key to grip the next pot.
  2. Weight- 70 g. Inside diameter- 4.5 cm. Outside diameter- 6 cm. Height- 6 cm.
  3. The open mouth of pots are placed on a 6 mm cement sand mortar bed (1:4) on roof slab. The mortar is prepared with SYLOCON® SUPER @ 1 litre per
    50 kg cement

4. After placing the inverted earthen pots, laying and filling the gaps between pots with 1:2:4 concrete using SYLOCON® SUPER @ 1 litre per 50 kg cement.

5. Screed concrete should be laid in slope for easy draining out of stormwater.

6. Stand pool water curing is mandatory.

The above specification provides excellent thermal insulation and waterproofing for the long term. You can fix broken tiles on top of the screed.

Please refer to the following images for better understanding. You can contact You will get more information regarding the availability of soil pots and SYLOCON® SUPER.

This is an excellent thermal insulation and waterproofing system, which is durable and building-friendly.

SYLOCON® SUPER is the perfect choice to make screed concrete waterproof, and it makes concrete shrinkage crack free. Mostly in screed concrete on top of the roof is cracked due to the thermal expansion and contraction. The underneath polymer waterproof coating is decayed due to the bacterial attack. Any synthetic insulating material has no bonding property with concrete. That is why the screed concrete is cracked. Once the screed concrete is cracked, water accumulation starts inside the screed concrete. The heating and cooling cycle of the atmosphere causes the crack propagation in screed concrete. Once the crack is developed, water leakage is the most common problem. So, roof treatment is a very sensitive part of building construction. The heat generated due to solar radiation causes different problems in buildings. Crack is one of the major problem, which is very difficult to rectify. Any solution like crack sealants lasts for certain period. Water leakage starts in monsoon through the developed cracks. So, thermal insulation and proper waterproofing of roof is of high importance after all the building construction activity is over.


SYLOCON® SUPER can eliminate both the problems. Nano fibres and nano tubes in the composite does not allow any shrinkage crack on the surface. This is inorganic, so compatible with concrete.

When the soil pots come in contact with SYLOCON® SUPER added mortar, nano tubes of SYLOCON® SUPER impregnates through the soil wall and make it waterproof, enhancing the bond strength between pots. This also provides the non-shrink property between the mortar and soil pot. This is the most effective and durable method of roof treatment. Thermal conductivity indicates how easily heat will flow through a material, whether it is a brick or a layer of insulation. This measurement doesn’t relate to the thickness of the material; the number is the same, whatever the thickness. The thermal conductivity of the material is used to calculate R values. The inverted soil pot is an air-filled porous hollow space. Thermal conductivity is very low, less than 0.0333 –k- W/ (m k), Btu/ (ft. h F).

      …To be continued in Part XIV

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