Installation Guide
![](/manual/jeld-wen/8b8701/installation-guide-english/images/img-3.png)
INSTALLATION INSTRUCTIONS
for Vinyl Projecting Windows with Integral Nailing Fin (JII023)
3
FOR RETROFIT INSTALLATIONS
1. Remove
sufcient
siding to
expose enough
intact building
wrap to
properly seal
the window to
the opening.
2. Remove the
old window. If
building wrap
is damaged,
apply new
building wrap
in shiplap
manner. Verify
trimmer studs/header are structurally sound. Continue with the
instructions.
INSPECT ROUGH OPENING
2
•Verifythe
width and
height of the
bay or bow
window are
each 1/2"
smaller than
the rough
opening width
and height. The
rough opening
for the garden
window should
be the same
sizeasthe
window frame.
A
B
D
C
E
•Verifytheroughopeningissquare.The(A)and(B)measurements
above should be the same. Maximum allowable deviation from square
is1/8"forwindows20sq.ft.andsmaller,and1/4"forwindowslarger
than 20 sq. ft.
•Verifytheroughopeningislevelandplumb(C).Themaximum
allowabledeviationis1/16"forevery2'ofroughopening(notto
exceed 1/8").
•Verifytheroughopeningsillisnotcrownedorsagged(D).
•Verifytheexteriorfaceoftheroughopeningisasingleplane(E)with
less than 1/8" twist from corner to corner.
•Verifytheheaderissupportedbytrimmerstuds.
PREPARE ROUGH OPENING
3
45°
PREPARE BUILDING WRAP
Note! Check with your building wrap manufacturer to verify that the
following steps do not void their product warranty.
1. Trim building wrap ush with the edges of the rough opening.
2.Atthehead,cutbuildingwrap45°andtapeupasshown.
Note! If installing a bay or bow window, proceed with section 4
“PREPARE SILL FOR BAY/BOW WINDOW.” If installing a garden window,
skip to section 8, “PREPARE SILL FOR GARDEN WINDOW.”