Order unanimously affirmed with costs. Memorandum: National Structures, Inc. (defendant) was the general contractor on a construction project where plaintiff was employed as a plumber by third-party defendant ABL Plumbing Heating Corporation, a subcontractor. While installing piping in the ceiling of a housing unit, plaintiff was standing on the third or fourth rung of a six-foot, wooden ladder provided to him. To avoid a falling shim that had become dislodged above him, plaintiff shifted on the ladder, the ladder gave way and plaintiff fell to the concrete floor, injuring his lower back. As the general contractor, defendant had the nondelegable duty to provide plaintiff with adequate safety devices to protect him from "risks related to differences in elevation" (Groves v Land's End Hous. Co., 80 N.Y.2d 978, 980; see, Rocovich v Consolidated Edison Co., 78 N.Y.2d 509; Root v County of Onondaga, 174 A.D.2d 1014, lv denied 78 N.Y.2d 858; Drew v Correct Mfg. Corp., 149 A.D.2d 893; Staples v Town of Amherst, 146 A.D.2d 292). It is uncontroverted that plaintiff fell while working at an elevated site as the result of the absence of adequate safety devices. Therefore, Supreme Court properly granted plaintiff partial summary judgment on the issue of liability pursuant to Labor Law § 240 (1).