WAC 296-874-40042. Meet these requirements when using window jack scaffolds

You must make sure window jack scaffolds meet all of the following: (1) Are securely attached to the window opening; (2) Are used for working only at the window opening the jack is placed through; (3) Are not used: (a) To support planks placed between one window jack and another; or (b) As any other element of scaffolding.