-NARROW EXCAVATION PRIMARLY FOR STRIP FOUNDATIONS AND BURIED SERVICES.
-EXCAVATIONS CAN BE CARRIED OUT BY HAND OR MACHINE.
-SIDES OF EXCAVATION CAN BE BATTERED OR STRAIGHT.
DISAVANTAGE-EXTRA COST OF OVER EXCAVATING AND EXTRA BACKFILLING
ADVANTAGES-NO TEMPORARY SUPPORT REQUIRED TO SIDES OF EXCAVATION.
DISAVANTAGE-SIDES OF EXCAVATION MAY REQUIRE SOME DEGREE OF TEMPORARY SUPPORT.
ADVANTAGE-MINIMUM AMOUNT OF SOIL REMOVED AND THEREFORE MINIMUM AMOUNT OF BACKFILLING .
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