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  There are many ways heat can be lost in buildings. How many of these do you think apply to your school?

  Pitched and flat roofs
As warm air rises, it will be lost through the roof if this is uninsulated. About 25% of heat can be lost in this way. Laying mineral wool or fibre glass between the joists will reduce heat loss. Flat roofs are most costly to insulate so it is best to do this when the school is repairing the roof anyway.

Large window areas
Heat travels quickly through single panes of glass. If your school has large areas of window that are single glazed, these will contribute greatly to heat loss. Secondary glazing will reduce heat loss through the window areas. Metal framed windows will lose more heat through the frame than wooden framed windows because metal is a poor insulator.

Draughts around doors and windows
About 15% of heat in a building can be lost though draughts around doors and windows. Installing a draught lobby or fitting well-maintained draught proofing around the doors and windows will reduce heat loss in this way.

Heat loss through an uninsulated wall
If your school was built after the 1930s, it will probably have cavity walls; an air gap between the inner and outer walls. About 35% of heat is lost through an uninsulated wall. Insulating a cavity wall is relatively easy and involves injecting insulation material such as polystyrene beads or mineral fibre between the walls.

If your school is old and built before 1900, it will probably have solid walls. Solid walls can be insulated externally but this can be costly and is best done when work is being carried out on the walls anyway.
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