Grain Systems Tanks PNEG-4072G - Manual (Page 90)

Chapter 7: Roof Assembly
Assembling Purlin Number 1
Purlin number 1 is located first from the eave.
Before You Begin
Place two roof rafters on the ground with roof panel holes facing up. Several A-frame assemblies will have
X-bracing installed and be placed periodically throughout the perimeter of the roof. Determine if X-bracing
is being installed and note those steps in this procedure.
What You Should Know
The A-frame assembly consists of two roof rafters identified as the left-hand roof rafter (A) and the right-
hand roof rafter (C). The purlin configuration may not be the same on all A-frames at this location, (number
1), depending if X-bracing is being installed or not.
There are also two different purlin clips, a left purlin clip (E) and a right purlin clip (D). The left purlin clip
has seven holes, compared to the right, which has six holes along the purlin and purlin clip mating surface.
NOTE: The seventh hole located in the center of the left purlin clip (E) is for identification purposes only.
No hardware is used in this location.
1. Attach an upper left purlin clip (E) and an upper right purlin clip (D) to the right-hand roof rafter (C),
and install two flange bolts (F) and two flange nuts (I).
2. Attach an upper left purlin clip (E) and an upper right purlin clip (D) to the right-hand roof rafter (A),
and install two flange bolts (F) and two flange nuts (I).
3. Secure the bottom portion of previously attached each X-brace (R and S) with a flange bolt (F) and
one flange nut (I) to the upper left purlin clips and the upper right purlin clips. For top portion details,
see
Assembling Purlin Number 2, page 88 .
4. Install a flange bolt (N) and a flange nut (O) securing the X-braces together where they cross.
5. Install the purlin (H) to the upper right purlin clip (D) and the upper left purlin clip (E) located between
each roof rafter.
6. Attach a lower right purlin clip (K) and a lower left purlin clip (J) to the purlin and install twelve flange
bolts (B) and twelve flange nuts (G), securing the purlin to the purlin clips.
NOTE: If no X-bracing is being installed, proceed to step 11.
7. Attach the bottom X-brace (U) to the right lower purlin clip and the right-hand roof rafter (C), and
install a flange bolt (F) and a flange nut (I) into the bottom hole.
IMPORTANT: For adjustment purposes, DO NOT tighten the X-brace flange bolts until all X-braces
have been installed.
8. Attach the top X-brace (T) to the left lower purlin clip and the left-hand roof rafter (A), and install a
flange bolt (F) and one flange nut (I) into the top hole.
9. Secure the bottom portion of each X-brace (T and U) with a flange bolt (F) and one flange nut (I).
10.Install a flange bolt (N) and one flange nut (O) securing the X-braces together where they cross.
11.After all purlins are installed, tighten the hardware to the recommended torque specifications. See
Bolt Torque Specifications, page 24 .
90 Pneg-4072G 72 Ft Diameter 40-Series Bin