Flooring - 4 1/4 x 12
| x | Denotes roll formed | |
| xx | Per plank | |
| xxx | Approximately 50 PSF (4 1/4" x 12") or 45 PSF (3” x 9”) or 37 psf (2” x 6”) of asphalt surfacing is required to fill 2” average cover over top of corrugations. |
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| xxxx | Indicates maximum clear span between stringer flanges. |
