Floors in cold stores, ice stadiums etc.
It might seem contradictious to heat up the floor construction in a cold store, - but it is actually a necessity in order to protect the building.
In cold stores where the temperature is constantly between -20 and -30oC, coldness will still be given off to the surroundings even though the floor is well insulated.
This means that the materials which are in contact with the ground, such as foundation and floor areas, will absorb the cold and the ground will freeze. The water content in the ground/soil will expand and this can cause considerable damages due to frost erosion.
The same problem also appears in ice stadiums, which are artificially frozen.