A collapsible builders' staging is provided for use on a pitched roof to eliminate the need for complex scaffolding erected about a chimney stack in need of repair. A staging unit comprises a base member (1), an upright (12), and a slidable collar (8) pivotally connecting an end of the upright (12) to base (1). A tie (15) connects the base (1) and the upright (12). Each end of the tie (15) is pivotally connected to a respective one of the base (1) and upright (12). The staging unit can be moved between a collapsed configuration in which the base (1), tie (15) and upright (12) are substantially parallel and an erect configuration in which, with the base (1) extending down the pitch of the roof, the tie (15) is substantially horizontal.
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