Very often, when people are insulating a house, they insulate the roof space, double glaze the windows but forget to insulate the floors. If the rest of the room is insulated, the floor becomes a thermal weak point.
A solid ground floor is difficult to insulate retrospectively. However, if there is enough room to increase the height of a floor slab or if it is a suspended concrete slab construction, one can sometimes get access under the floor making it possible to improve insulation.
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