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Home Insulation ProjectHow heat is lost from the home.Heat is lost mainly from areas in the home which are least protected with insulation from the outside climate

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Home Insulation Project

How heat is lost from the home.

Heat is lost mainly from areas in the home which are least protected with insulation from the outside climate. In most houses the most heat is lost through the roof, this is because heat rises and many people don’t live in their roofs/lofts so there is no point for having insulations in the floor, ceiling and walls if no one is going to be in their for very long periods of time.

Convection currents form over land that is warmer than the surrounding land. The current of warm air are referred to as thermals.

For example, when a portion of the atmosphere becomes heated by contact with a warm area of land, it rises into the cooler, higher altitudes, with the result that some of the moisture carried with it may be condensed to form clouds and precipitation. In houses that have gas fires with a chimney, the hot gases are extracted out to the atmosphere outside the home through the chimney. If this is doesn’t happen there would be a high

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Wall Insulation

Most heat (up to half the total) is lost through the walls of an un-insulated house. Wall insulation can reduce this loss by two-thirds and make your home more comfortable. If there are cavity walls they can usually be safely filled with insulating fibre, beads or foam.

If the walls are solid, internal insulation (often applied in the form of an insulated board fixed to the wall) is highly effective, but means rooms have to be redecorated and may lose architectural detail. This can be done by competent do it them selves people and may be done on a room by room basis at the same time the home is redecorated. External insulation usually needs planning permission and should only be carried out by specialist companies.

Window and Door Insulation

Draughts are the most uncomfortable and obvious signs of a badly insulated house and can be fixed easily with either draught proofing, secondary or double glazing. Polypropylene tubes are expensive but last longer than most bog standard insulation devices and are more effective. Fires need a good flow of air to burn safely and there is a danger of being poisoned by Carbon Monoxide fumes if a room is too tightly sealed.

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Draught Excluders

Draught proofing can be very cost effective because its cheap to install and can save 15% of the heat loss from your home.

Draught excluders are usually a self adhesive foam profile, which is soft and flexible, available for use all around the house in gaps located in windows and doors, for example a gap underneath the window that you believe is allowing a low amount of air draught through it. You would apply this foam substance to the area. This would then seal the affected area.


Hot Water Tank Insulation

Insulating hot water tanks and pipes will help to keep your hot water hot.Polyurethane foam insulation in thicknesses up to 2" are applied to the sidewall and dome top. The foam is covered with a protective weather resistant covering. image04.jpg

The most popular insulating product for hot water tanks is

Polyurethane Foam

Is a two component sprayed coating that expands and hardens to about two inches thick, for about an R16 insulation value. When cured, it is coated with 25 mils of semi- rigid white acrylic weatherproof coating.


Source’s used:

Internet sites



*www.google.com (for diagrams)

*www.altavista.com (for diagrams)




  • Microsoft Encarta 2003
  • Britannica 2004 Deluxe Edition


  • Physics (higher), Heinemann
  • The Hutchinson Encyclopaedia


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