EFCO 406X Series - Manual (Page 9)

Series 406X Storefront Installation Instructions
EFCO 2014 Page 9
Section 3B. Shear Block Fabrication
The shear block system is a fabrication and erection method that permits the preassembly of single units in the
shop or at the job site. These units are joined with shear blocks and then installed as an assembled unit in the opening
on top of any sill flashing that is used.
Fabrication Steps:
1. Measure the opening to determine the cut lengths of the frame components.
 Allow a minimum 1/4” clearance at head and jambs and 3/4” clearance at the sill for shims and caulking.
 Allow extra clearances, if necessary, to accommodate building tolerances and building movement.
2. Cut the vertical to frame size.
 Verticals must run through.
 If the opening has an entrance, see the appropriate frame and door fabrication installation sheets.
 Door jambs run to the floor and are cut longer than other verticals.
3. Cut horizontal members to day lite openings. (Between vertical members)
4. Cut the horizontal glass stops to day lite opening minus 1/32”. (DLO - 1/32”)
5. Drill holes for shear block screws on vertical members and prepare attachment holes on horizontal members per one
of the following methods.
 Drill jigs are available. (See Page #6)
 Layout holes per details #4,5,6 and drill.
 Use punch press with appropriate die set.
Drilling Patterns
Outside Glazed
Bead-Down
Shear Block
Verticals
 Left Hand Shown,
Right Hand
Opposite
 Use Drill Jig
#DJ53
 Use a .180” dia.
No. 15 drill bit at
darkened holes
only.
Fig. #4