A ground floor room can lose about 15 % of its heat through the floor.
Ground floors are usually made of suspended timber or solid concrete or screed.
The insulation of a suspended timber is straightforward: Insulating material can be stuffed between the joists as long as it is not too firmly compressed. Air vents in external bricks should be left open for ventilation.
With solid floors a room will warm up faster if the insulating material is placed above the solid concrete floor. The problem is that it will also cool down faster. Solid floor insulation in this position will also impact on the floor level, door posts and openings and any other fixtures. If the insulation material is too bulky, it may make the room feel out of proportion.
A thin but effective insulation material is phenol foam, ideal as it provides heat protection with only a thin covering. The insulation itself can be covered over by thin board and the householder's final floor covering of choice.
The best way to insulate a solid floor is below the slab. Insulation in the form of a damp proof layer or membrane can be placed beneath the floor.
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