EFCO Special Purpose Windows Installation - Manual (Page 14)

EFCO CORPORATION 3/5/2014 PART NO. YW40 Page 4 of 7
Window Installation Instructions - Basic Window Installation Section -
Installation of Gravity Anchors
Typically gravity anchors are used for two
reasons.
1. To hold one window up off another
window to allow for thermal
expansion. (Not usually used for
vertical bays less than 10 feet tall.)
2. To hold the weight of the upper
window off the lower window to keep
the head from bowing or twisting.
HA90 Gravity Anchor
.312 Dia. Hole
Material: .250 steel
with zinc chromate
finish
1/4” Dia. Bolt Assembly
Bolt runs through both
anchors and the mullion.
Field drill clear hole in
mullion.
Hole for anchorage
to opening or
mullions.
Shim as
Required
Note:
All stacks &
subsills must be
set in a bed of
sealant to ensure
a watertight seal
(Interior and
Exterior).
Typical Gravity Anchor
at a Mullion
Typical Horizontal
Stack Joint
Completely read the General Installation Instructions and all other sections which pertain to
your project before starting work. These recommendations are for general erection
procedures only. For actual job conditions, see the details on the shop drawings. For
perimeter anchor types and spacing, refer to the approved shop drawings or consult the
project design professional.