We all know that ceiling insulating your home keeps it cool in summer and warm in winter, but how exactly does it do this? To fully understand the science of ceiling insulation, you need to have a basic understanding of heat flow.
Heat flows in one of three ways – via radiation, convection or conduction.
Conduction is the way in which heat moves through materials – think of how your saucepan conducts heat to its handles while you cook, for example. Convection is the way in which heat circulates through gases and liquids, while radiant heat simply moves in a straight line, heating anything in its path that is solid and absorbs its energy.
Heat is thermal energy, and the laws of science dictate that it must move from warmer to cooler until there is no longer a difference in temperature. Picture, then, your home in winter. Heat flows directly from all the rooms you’re spending a fortune to heat to all the unheated spaces, such as the roof space, adjacent garage, cellar or basement, and even to the outside. In the summer, the heat can’t wait to move right back in – coming in from outside where it’s hot, to inside, where you have the air-conditioning on. The heat will only be happy once the inside is the same temperature as the outside.
Heat flows from warmer to cooler until there is no longer a temperature difference. In your home, this means that in winter, heat flows directly from all heated living spaces to adjacent unheated attics, garages, basements, and even to the outdoors. Heat flow can also move indirectly through interior ceilings, walls, and floors–wherever there is a difference in temperature. During the cooling season, heat flows from the outdoors to the interior of a house.
This is why you need ceiling insulation?
Most insulation materials work by slowing down conductive heat flow. Air is a poor conductor of heat, so the tiny pockets of air trapped in the insulation material minimise the amount of heat which can pass between the inside and outside of your house. Properly insulating yours provides an effective resistance to the flow of heat, keeping it cool in summer and warm in winter.
Aerolite ceiling insulation provides a high resistance to the flow of heat throughout the building envelope of your home. This significantly limits the impact of the outside temperature, helping to maintain a stable and comfortable living environment. Find out more at www.aerolite.co.za or at