A scaffold board

There are several disadvantages with solid wood and laminated veneer lumber (LVL) scaffold boards, including that they are relatively expensive, they are relatively heavy, they are perishable, they are not UV Light resistant, they are flammable, they are not resistant to chemical contamination, they are not resistant to propagation of mount spaces and bacteria, and they are not recyclable. A scaffold board (10) of extruded thermoplastic material. The board includes a substantially rectangular outer profile and a plurality of strengtheners (20). The substantially rectangular outer profile is defined by a top wall (12), a bottom wall (14) and a pair of side walls (16, 18). The plurality of strengtheners (20) each extend between an inner surface of the top wall and an inner surface of the bottom wall. Each of the strengtheners have a middle part (20c), a pair of top parts (20a, 20b), and a pair of bottom parts (20d, 20e). The middle part is oriented normally to the plane of the top wall and the bottom wall. The pair of top parts each extend outwardly from a top of the middle part to the inner surface of the top wall in substantially equal and opposite directions respectively. The pair of bottom parts each extend outwardly from a bottom of the middle part to the inner surface of the bottom wall in substantially equal and opposite angles. The top wall, the bottom wall, the side walls and the strengtheners are integrally formed.