The main objective of thermal insulation of heat insulation of a building is to conserve a constant heat or temperature inside building, irrespective of temperature changes outside. The heat in a building structure is mainly transmitted through the roofs, exposed walls and exposed wall openings, such as windows, doors, ventilators, etc. and accordingly the methods of heat insulation usually adopted are as follows:.

  • Methods of heat insulation of roofs
  • Methods of heat insulation of exposed walls

It is desirable from comfort considerations that thermal transmittance ‘U’ of exposed roofs should not exceed 2k.cal/m2 h0 C. Hence, methods are adopted to bring down the excess of ‘U’ value by treating the roofs.
Heat insulating materials described are applied externally to the roofs. In case of external application, heat insulating materials may be installed over the roof above or below a waterproof course. In case of internal application, heat insulating materials may be fixed by adhesives or otherwise, on the underside of roofs from within the rooms.

For walls, also in view of comfort consideration, it is desirable to have the thermal transmittance (U) of exposed walls not greater than 2 k.cl per m2 h0C.
The heat insulating materials of different types can be installed or fixed on the inside and outside of the exposed wall in order to reduce the thermal transmittance to the desired limits.