WAC 296-878-18020. Move safely on the outside of buildings

You must make sure you travel on the outside of the building only when: (1) You keep at least one window-cleaner's belt terminal attached at all times; (2) The anchors are not more than forty-eight inches apart. Note: Anchors can be up to seventy-two inches apart if: 1. The sill or ledge is continuous; 2. The sill or ledge is at least twelve inches wide; 3. The sill or ledge has a slope less than five degrees; 4. There is at least six inches of window sill in front of the mullions.