Role of Building Insulation in India’s Energy Future

Talked about thermal insulation in last couple of blogs and how it is more cost effective than additional energy generation (1 unit of energy saved is equivalent to 2.75 units of energy generated). Buildings consume almost 40% of energy generated and almost 65% of this consumption goes into heating and cooling inside ambience. If  we are able to save 40% of this heating/cooling load (very easy with KOOLTILE/KOOLSHEET overdeck roof insulation, checkout koolsheets-flat-roof-insulation, it shall be equivalent to generating an additional 30% electrical power and well imagine the investment saved and the cost of generation saved and then the CO2 generation saved and thus the global warming prevented and so on and so on. One can easily fill in the value figures and then be astonished by the results.

What is thermal insulation ?
In the context of building, thermal insulation is an additional thermally insulating layer added to the building envelope (the skin of building  which encloses the inside space), which prevents / resists incursion of the outside atmospheric temperature to the ambience inside.

How is thermal insulation measured ?
This is the reverse of something called thermal transmittance or U value of the envelope part (i.e. Roof, wall or fenestration) and is called the R value(Total) of the envelope. The U Value is measured as Watt hours of energy conveyed every hour through every square meter area of building envelope with a temperature difference between outside and inside of 1 degree centigrade  (W/sq.m deg C).

The total thermal resistance of the building section (i.e. Roof or wall) is R (T) or R Total and is equal to 1/U.


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Madan Mohan Roy

Mission "Green" The Earth

A mechanical engineer from IIT, Kanpur, through the 30 years of my entrepreneurial journey, I have learned that we tend to be unaware of many “Staring at our face” things unless trained to interpret them at the conceptual level. The “Building” decision-makers are unaware of the “Building-Physics” as this is not dealt with in a structured fashion at the college level. Yet they are at the helm of a segment that accounts for 35% of national energy consumption and generation of 40% of Green House Gases. This blog site is my humble effort at making them”conceptually aware” of facts they already know quite well.

Category wise posts

ICF Buildings

wall insulation

Roof Insulation

Facade Beautification

Interior Seepage


Polymerized cement waterproofing

Building Physics

Thermal insulation