250050 R1
67
6.23. Install Lower Plenum Sheets
In this step you will begin the installation of plenum sheets on the lower part of the rafters.
1. Position the first lower plenum sheet on a set of lower rafter bolt holes (using the sheet locators to align the
bolt holes in the sheet).
2. Bolt the lower plenum sheet through the sheet and the rafter bolt holes.
3. Continue to install the sheets next to the one most recently installed, overlapping all sheets in the same
direction. Use 1/2” x 1” hex drive truss bolts (90100490) and 1/2” flanged nuts (028002).
4. Install grain band posts where they should be located during this operation.
5. Continue this operation, until all lower sheets are installed.
Important
Ensure the top flange of the rafters and the tension segments are level before installing the lower
plenum sheets. If they are not, this will lead to bumps in the plenum sheets. This will lead to gaps in
the plenum flashing which is not allowed.
Figure 33.
Installing Lower Plenum Sheets
1/2” x 1”
HEX DRIVE
TRUSS BOLT
90100490
(all places)
1/2” FLANGED
HEX NUT
9005043
(all places)
LOWER
PLENUM SHEET
24’ - 006193
27’ - 006177
30’ - 006158
30’ BATCH (10) - 006168
36’ - 004853
36’ BATCH (12) - 004824
RAFTER
EASYDRY® WIDE-CORR CENTURION® GRAIN BIN – GRAIN BIN DRYER