EFCO 8750XD - Manual (Page 33)

EFCO 2012 Page 33
Series 8750XD Unitized Curtain Wall Installation Instructions
Section 9 - Applying Critical Seals and Stack Gasket
Create a bed of
sealant to lay the
gutter splice into.
1. Once a complete row of units has been installed the WEA2 stack gasket must be applied from the roll to avoid unnecessary splicing. See Figures 73 and 74.
2. A splice is also required at the gutter at the top of the units, before units are stacked on top of them. Clean the gutter sill sealant contact surfaces using
an approved solvent or cleaner of all oils and other contaminants where the gutter splice will be applied. The sealant manufacturer’s preparation
and application instructions should be followed exactly. If sealant primer is required, apply it per the primer/sealant manufacturer’s instructions.
3. Apply a bed of sealant on the gutter that will cover the area where the splice sheet (HC13 or HC14) will be applied. When creating the bed of sealant, apply
a generous amount of sealant directly on top of the primary seal location as shown in Figure 74.
4. The sealant must go from the front of the gutter up the engagement leg to the WEA2 gasket track. The sealant bed must be wide enough to cover the entire
area of the gutter splice. See Figure 74.
5. Lay the gutter splice into the bed of sealant. Press the gutter splice up under the WEA2 gasket track. See Figure 75. Smooth the splice down onto the
gutter, forcing out all air bubbles.
6. Apply sealant around the perimeter of the gutter splice. Tool the sealant to ensure a watertight seal at the splice. See Figure 76.
7. Apply sealant in the gap between the two snap in legs for the WEA2 gasket, across the top of the engagement leg and down the back leg. Tool the sealant
into all voids to ensure a watertight seal. See Figure 76.
HC13 or HC14 Silicone
Splice Sleeve
Figure 73 Figure 74
Figure 75
Figure 76
WEA2 Stack Gasket
Apply sealant around
the entire perimeter of
the gutter splice and
tool to create a
watertight seal.
Apply sealant between
the engagement legs
of the two units. Tool
sealant to create a
watertight seal.
Back seal
down leg.
WEA2 Stack Gasket