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Tiered walls are considered one wall <br />unless separated by at least twice the <br />height of the lower wall. Walls are <br />measured from the bottom of the <br />foundation to the top of the wall. <br />Walls retaining in excess of 4' <br />of backfill require engineering <br />follow manufacturer's installation <br />instruction for min distance to grade. <br />Per R1003.9 - Chimneys shall extend <br />not less than 2' higher than any <br />portion of a building within 10'