
Chapter 4: Installing Winding Bin Stairs (Intermediate to Eave)
2. Align the bottom end of the next 5-step stair section (AB) to the top end of the first 5–step stair sec-
tion (AA) and secure using flange bolts (2) and flange nuts (3).
NOTE:
Hand-tighten the flange bolts (2).
3. Align the bottom end of the next 5-step stair section (AB) to the handrail post (49) and the inside
stringer support (48) and secure using flange bolts (2) and flange nuts (3).
NOTE:
The top end of the 5-step stair section (AB) will be aligned to the eave platform whenever it
is installed.
NOTE:
Hand-tighten the flange bolts (2).
Figure 4-3
Installing the next 5–step stair section
2
5/16 x 3/4 in. flange bolt (S-6606)
49
Bin stair handrail post (WBS-0004)
3
5/16 in. flange nut (S-3611)
AA
First 5–step stair section
48
Inside stinger support (WBS-0088)
AB
Second 5–step stair section
IMPORTANT:
As the stair sections are being
installed, make sure that any offset
(AF) between the stringers is consis-
tent throughout the winding bin stair
assembly.
4. Leave all flange bolts (2) hand tight until the eave platform is installed to the bin wall.
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PNEG-2077
TopDry – Platforms and Bin Stairs