a material transport system for delivering and dispensing a large capacity of materials at a construction site using a plurality of removable carriages , each bearing a roll of material , mounted on a movable frame . the frame comprises a pair of dual powered axles each driving either a set of drive flanged rollers , or a set of conveyors , for moving the system along purlins , or joists , of a building . the flanged rollers are used when dispensing of material to a side wall of the building is desired and the building is roofless , and when dispensing of material to an end wall of the building is desired and the building is roofed . the conveyors , which are removably mounted to the underside of the material transport system , are used for dispensing material to a side wall when the building is roofed , and when dispensing material to an end wall when the building is roofless . in either case , the flanged rollers , or the conveyors , are simultaneously driven by a common pair of dual - powered axles to negotiate the constant or changing elevation of a building &# 39 ; s roof structure .