EFCO Special Purpose Windows Installation - Manual (Page 40)

EFCO 2014 1
Window Installation Instructions - Typical Subframe Installation Section
Sealant over strut area
1/4” diameter weep holes
Subsill extension
Preferred method of sealing
extension to subsill (visible seal)
Alternate method of sealing
extension to subsill (blind seal)
STC6 End dam a achment
screws (by EFCO)
Subsill Prepara on Prior to Installa on
 Measure the opening for the horizontal opening dimension.
 Square cut the subsill the length of the M.O. (masonry
opening) minus 1/2”.
 Sealant over strut area is by EFCO if subsill is ordered
fabricated. If subsill is ordered in stock lengths this sealant is
by installer.
 If the subsill has an extension:
 The extension must be cut to the same length as the
subsill.
 Check the opening condi on and shop drawings to verify
that no special notches in the extender are required.
 Slide the extension into the subsill as shown and flush up
the ends.
 Seal the extension to the subsill using one of the two
methods shown in the figures to the le .
 While the sealant is s ll wet, care must be taken to the
orienta on and handling of the extension in rela on to
the subsill. The extension should be supported in the
desired finished posi on while the silicone is curing.
 Field drill 1/4” diameter weep holes 6” from each and not to
exceed 5’ on center (by installer).
 Profile seal the end of the subsill and a ached the end dam
gasket and the end dam with the provided STC6 screws. Tool
excess sealant squeeze out.
 It is the installers responsibility to properly clean and seal end
dams to ensure a water ght installa on. Subsills should be
tested periodically during the installa on by blocking off the
weep holes, filling the subsill with water and inspec ng for
joint leaks. EFCO will not be responsible for leaks due to
improperly sealed or missing end dams.
End dam gasket
Profile seal end of subsill
(required)
End dam