D.C. Mun. Regs. tit. 12, r. 12-J403
Strike Section 403.3.1 of the International Existing Building Code in its entirety and insert new Section 403.3.1 in the Existing Building Code in its place to read as follows:
Design live load. Where the alteration does not result in increased design live load, existing gravity load-carrying structural elements shall be permitted to be evaluated and designed for live loads approved prior to the alteration. If the approved live load is less than that required by Section 1607 of the Building Code, the area designed for the nonconforming live load shall be posted with placards of approved design indicating the approved live load. Where the alteration does result in increased design live load, the live load required by Section 1607 of the Building Code shall be used.
Exception: Buildings erected before July 1, 1925: In the alteration of buildings erected before July 1, 1925, the engineer of record is authorized to apply a maximum reduction of thirty percent (30%) of the specified minimum live loads in Table 1607.1 of the Building Code for live loads above 40 psf (1.92 kN/m2), provided that official live load placards are posted on the public areas of the affected floors showing this reduced live load. Live loads shall not be reduced to less than 40 psf (1.92 kN/m2).
D.C. Mun. Regs. tit. 12, r. 12-J403