EFCO Special Purpose Windows Installation - Manual (Page 44)

EFCO 2014 5
Window Installation Instructions - Typical Subframe Installation Section
Installa on of Window into Subframe
 Immediately before the window is set into the subframe, run a bead of
silicone sealant along the subsill where the exterior leg of the window will
set. This step is not op onal.
 Run a bead of silicone sealant on the exterior leg of the subhead and
subjambs next to the gasket reglet. Ensure that the bead is taller than the
gasket other wise it will not make necessary contact with the window
when it is installed. (this step may be leŌ out if and only if the subframe to
window joint is cap sealed aŌer the window is installed see page 8)
 Seal the bu joint between the subhead and the subjamb.
 Install the window se ng the sill into the subsill and rota ng the head in.
Do this carefully to avoid destroying the con nuity of the sealant lines that
were just created.
Bed of silicone sealant for
sill of window to set in
(required)
Back bed windows to
subframe contact
area (do this at head
and jambs)
Make sure sealant
bead is taller than
the bulb vinyl
Seal the bu joint
between the subhead and
the subjamb.

Note: The figure below shows a standard square
cut subjamb to subhead joint. Alternate soluƟons
to block this void and address air infiltraƟon from
the wall cavity include: End notching subjamb,
using an aluminum end dam or silicone sheet or
plugging with a sealant compaƟble material.