Grain Systems Tanks PNEG-1070 - Manual (Page 65)

10. Stiffeners
PNEG-1070 15', 18', 21', 24', 27' and 30' CHT’s 65
Universal Stiffener Starting Location 2.66" Reverse Corrugation
Outside Stiffener Only
For sidewall to stiffener connections, use 3/8" x 1" bin bolt except horizontal seam. 19 Gauge and 20 gauge
sidewall sheet will bolt four (4) locations per sheet. 18 Gauge will bolt at eight (8) locations per sheet.
17 Gauge and thicker sidewalls will bolt every 2.66".
NOTE: Splice plate and laminated stiffener to sidewall connection use 3/8" x 1-1/2" bin bolts.
Figure 10L