JELD-WEN JII101 Custom Wood & Fiberglass Exterior Folding Door Systems User Manual
Page 4
 
ASSEMBLY AND INSTALLATION INSTRUCTIONS
for Custom Wood & Fiberglass Exterior Folding Door Systems (JII101)
4
JOB SITE FABRICATED SILL PAN - CONTINUED
4. Take this distance
from the back edge 
and lightly crease a 
folding line across 
the sheet material.
5. For step-down
landings, cut 1/2" in 
at this line on both 
sides of the sheet 
material.
6. For continuous
slab, cut across the 
folding line.
7. Fold the three back
sides up to make a 
3-sided box, and, for 
step-down landings, 
fold the front flap 
down.
INSTALL SILL PAN
1. Set the sill pan
in the rough 
opening, aligning 
the front edge (for 
continuous slab) or 
folded down edge 
(for step down) 
with the exterior of 
the rough opening.
2. Mark a line across
the front and back 
of the sill pan.
3. Apply three 3/8"
beads of sealant 
between the lines.
4. Place the sill pan in
the rough opening. 
Firmly press the sill 
pan into the sealant 
with a J-roller.
INSTALL SILL PAN - CONTINUED
3
Sealant
4
PREPARE BUCK
Note!
This section applies to installations into a buck only. For
installations into a stud-framed wall, begin with section 5, “PREPARE 
STUD-FRAMED WALL.”
1. Seal any joint larger than 1/16" in the buck and between the buck 
and the concrete/masonry with sealant.
2. Cover the buck and the surrounding concrete/masonry at the head
and jambs and sill with liquid applied flashing as shown.
END of Buck Instructions, SKIP to section 6, “INSTALL DOOR.”
5
PREPARE STUD - FRAMED WALL
FOR RETROFIT INSTALLATIONS
Completely remove the old door unit. Verify rough opening is structurally 
sound and header is able to carry the combined weight of all the panels.
PREPARE BUILDING WRAP
Verify these steps are allowed by the building wrap manufacturer.
1. Trim building wrap flush with the edges of the rough opening.
2. If installing a drip 
cap, (recommended 
because this 
integrates the 
building wrap and 
drip cap to protect 
the structure and 
the product from 
incidental water) 
at the head, slit 
building wrap 6" 
at 45°. Tape up as 
shown.
45˚
6"
3. Trim the sides
sufficiently to allow 
the nailing fin to be 
mounted against the 
sheathing.
3. Apply spray adhesive/
primer to the sill pan 
and surrounding 
area. Follow 
manufacturer’s 
instructions for 
application methods.
4. Cut a piece of self-
adhesive flashing the 
length of the sill and 
apply over the sill pan as shown. The bottom of the sill pan should 
be completely covered by the self-adhesive flashing. For step down 
landings, fold flashing down as shown. For continuous slabs, trim 
flush with rough opening.
Sealant
joints
Liquid applied
flashing
Fold sides and back up
Fold corner
forward
Fold front
flap down
Continuous slab
Step-down