shown the first and second strips 28 and 29 are the narrowest and extend generally perpendicular to one another and nearly the entire diagonal distance across the lower skin 18 these and the subsequently applied strips are preferably made of fiberglass with the glass fiber orientation being primarily in the long direction for example 90 of the fibers the strips are applied with a resin adhesive and in a preferred embodiment the strips are laid in tension and held until the resin cures to provide a slight camber to the deck module 11 the camber is subsequently eliminated when the concrete layer 12 is laid on the upper surface the second strip 29 identical in size and shape to the first strip 28 is laid diagonally and perpendicular to the first strip third and fourth strips 30 and 31 which are wider and shorter than the first and second strips 28 and 29 are added fifth and sixth strips 32 and 33 again shorter and wider than the third and fourth strips 30 and 31 complete the reinforcing strip arrangement shown in fig3 obviously more or less strips of different dimensions could be used as required this arrangement can also be utilized to permit the use of a thinner lower skin 18 possibly as thin as 11 gauge about u215b inch or 3 mm possibly as thin as 0 015 in this built up strip arrangement concentrates the reinforcing at the center of the deck where the stresses are greatest any suitable skin material may be used for the.