I AM LOOKING FOR STYROFOAM - OR ANY OTHER IMITATION WOOD MATERIAL - TO BE USED AS EXPOSED BEAMS IN SEVERAL LARGE ROOMS. CANNOT USE GENUINE WOOD AS IT IS TOO HEAVY IN LOCATION FAMOUS FOR MANY EARTHQUAKES. ALSO, STYROFOAM ALREADY LOCATED IS APPROXIMATELY $10 TO $12 A LINEAR FOOT MAKING IT UNREASONABLY EXPENSIVE. CAN YOU HELP?