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Figure 7. Garage B <br /> The demolition of a concrete joist <br /> Y1� showing significant deterioration. <br /> Figure 8. Garage B <br /> A close up of the deteriorated concrete <br /> a. encountered in a joist repair. Note the <br /> separated layers within the concrete deck. <br /> The unsound concrete must be removed <br /> to solid concrete. The full extent of the <br /> removal is difficult to determine until <br /> demolition. <br /> Figure 9. Garage B <br /> Completed joist repair. <br />