a roof and including a mast rollers which connect the mast to the roof and a winch for adjusting the position of the scaffolding system relative to the roof application_number US 66112984 A description referring now to fig1 the scaffolding system of the present invention is shown generally at 10 used on flatroof 12 the scaffolding system 10 consists of an upper mast 14 coupled to a lower mast 16 via a sleeve 18 attached to the lower mast 16 is a horizontal platform 20 supported by a diagonal brace 22 projecting from the upper mast 14 is a horizontal rod 24 supported by a second diagonal brace 26 attached to the horizontal rod 24 are a pair of rollers 28 and 30 both moveable in the direction of arrows 32 on the flatroof 12 a pulley 34 is mounted to the free end of the upper mast 14 a winch 36 is mounted to the horizontal rod 24 opposite the side to which the rollers 28 and 30 are mounted a cable 38 originates around the winch 36 passes around the pulley 34 and terminates at a secure anchor the cable 38 is tied off for safety to the other side of the flatroof 12 or a vent stack the scaffolding system 10 is also vertically adjustable in the direction of arrows.