Geosynthesis
Development of root barriers, their construction and applications has progressed since 1992 when technology progressed from a concrete barrier which cracked and failed, to specific plastics with the capacity to handle major stresses and loads created by matric suction, soil and moisture movement.
Initial development of this product was based on stopping trees from affecting buildings, but as the research evolved it was discovered that what was actually being done was stabilizing moisture in reactive clay. A flexible waterproof cut off wall placed around a building will allow the building foundations to float on a block of stable clay and moisture, reducing the need for piers and other structure and proving to be very economical.
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