To surely apply thermal insulation (warmth keeping property) by inexpensive material, obtain fixed support force, and hardly cause deformation.
In forming a crushed stone layer S on the surface of a soil layer G to form a soil, a thermal insulation single layer formed of foam plastic aggregate is provided in the inside of a thermal insulation mixing layer Sk formed by mixing the crushed stone and foam plastic aggregate or the crushed stone layer S. A volume reduction body (EPS: particle having excellent strength and warmth keeping property, the outside thereof shows a cured state, and the inside thereof retains fine bubbles of air) formed by melting foam polystyrene with a specific gravity of 0.5 to 0.9 in the foam plastic aggregate is used.
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