Design the formwork for a concrete slab 8-inches thick whose net width between beam faces is 15 ft. concrete will be placed using a crane and bucket. the formwork is estimated to weigh 5 lb/sq. ft. decking will be 3/4 in. class i plyform with face grain across supports. all lumber will be southern pine. joists will be nominal 2-in. wide lumber. one 4-in. wide stringer will be placed between the beam faces. limit deflection to 1/360 of span length. commercial shores of 4,500 lb. capacity will be used. lateral support will be provided by the beam forms. adjust allowable stresses for 7-day loading.