WAC 296-878-12005. Make sure building surfaces and fixtures are safe to use

You must make sure building surfaces and fixtures are safe to be used before you begin the window-cleaning operation. This includes: (1) Guardrails, parapets, cornices and other building surfaces used to support suspended loads; (2) Permanently installed fixtures used as anchorages and tiebacks; (3) Window-cleaning equipment support systems permanently dedicated to the building.