Grain Systems PNEG-707GSI - Manual (Page 63)

5. Plenum Roof
PNEG-707 12', 18', 24' and 30' GSI Commercial Tower Dryer 63
Plenum Roof Sheets
Bolt plenum roof sheets over plenum roof rafters and over plenum roof flashing as follows.
Use 5/16" x 1" whiz lock galvanized bolts and nuts.
Insert bolts toward inside of dryer.
NOTE: Leave two (2) outside bolt holes on peak of plenum roof sheets open. Peak cap will be installed
there. (See Figure 5AQ.)
Overlap plenum roof sheets so that each sheet overlaps previous sheet with common bolts. In other words,
if working counterclockwise, left edge of each sheet goes over right edge of previous sheet.
When all plenum roof sheets are in place, tighten bolts. Also tighten bolts on tabs of plenum
roof flashing.
Figure 5AP Bolting Plenum Roof Sheets
Figure 5AQ Plenum roof sheet. Do not fill top two (2) outside
bolt holes on plenum roof sheets (circled) until peak cap installation.