Mueller 12x21 (D.I.Y.) with Optional Center Girts and Floor Kit - Manual (Page 12)

Mueller, Inc. 12x21 DIY Back Yard Kit Instructions; For additional information, see the D.I.Y Installation Video
12
MAKE SURE THE ASSEMBLY
IS SQUARE AND LEVEL
BP-1
BP-1
BC-1
BC-1
C-1
C-1
C-1
C-1
C-1
C-1
R-1
EC-1
EC-1
R-1
R-2
Make sure the assembly is square.
Assembly is square when the corner to
corner measurements are equal. Use
temporary bracing (not included) to
hold assembly square if required.