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From: DISTRICT OF COLUMBIA CONSTRUCTION CODES SUPPLEMENT OF 2008 DCMR 12A BUILDING CODE SUPPLEMENTCHAPTER 18A SOILS AND FOUNDATIONS SECTION 1805A FOOTINGS AND FOUNDATIONS Delete Section 1805.2.1 of the Building Code in its entirety and add new Section 1805.2.1 to read as follows:1805.2.1 Frost Protection. Except where erected upon solid rock or otherwise protected from frost, foundation walls, piers and other permanent supports of all buildings and structures shall extend to a minimum depth below adjacent grade of 2 feet, six inches (762 mm).

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