Washington Administrative Code
Title 296 - Labor and Industries, Department of
Chapter 296-878 - Safety standards for window cleaning
Section 296-878-18020 - Move safely on the outside of buildings

(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.