The foundations, floors, walls, doors, windows, ceilings, roofs, staircases, porches, chimneys, and other structural elements of the facility should be maintained so that the facility excludes wind, rain, and snow, and is rodent-proof, watertight and free from chronic dampness, weather tight, in good repair, and in every way fit for the use intended. Further, every interior structural element should be maintained free from holes, cracks, loose plaster, or other defect which renders the area difficult to keep clean, or which constitutes an accident hazard or provides insect or rodent harborage.
105 CMR, § 451.350