Instructions / Assembly
INSTALLATION INSTRUCTIONS
for Wood/Clad Wood Windows with Exterior Trim or Nail Fin (JII024)
4
PREPARE STUD-FRAMED WALL
4
45°
FOR RETROFIT INSTALLATIONS
After removing the old window, remove sufcient siding to expose 
enough intact building wrap to properly seal the window to the 
opening. If damaged, apply new building wrap in shiplap manner. 
Verify the rough opening framing is structurally sound. Continue with 
the instructions.
PREPARE SILL
PREPARE BUILDING WRAP
2. Cut a piece of drain mat the 
lengthofthesillplus6".
3.Placedrainmatonrough
opening sill, wrapping the 
drainmatup3"oneach
jamb as shown.
4. Pull release tape and set 
JELD-WEN drain mat into 
place.
5.Foldthedrainmatdown
onto the sheathing. Staple 
drain mat to the wall and 
seal the corner edges as 
shown.
6.Smoothoutanybubblesor
creases with a J-roller.
Note! Shims must be 1/4" 
shorter than the depth of the 
drain mat, should level the 
sill and be no more than 1/4" 
thick.
7. Shim the sill 4" from each 
corner, at 8" intervals, and 
on both sides of mull joints 
with non water-degradable 
or compressible shims. 
Secure shims with sealant.
8.ForadditionaldrainageforwindowsratedaboveDP50,cuta2"wide
strip of drain mat and apply vertically beneath the drain mat at 12" 
intervals.
Note! Check with the building 
wrap manufacturer to verify 
the following steps will not 
void their product warranty. 
Follow manufacturers' 
instructions.
1. Trim building wrap ush 
with the rough opening.
2. At the head, cut building 
wrapat45°andtapeup
as shown.
1. Measure the width of the 
frame from the interior to 
the trim/n and add 1/8". 
Transfer this measurment 
from the outside edge of 
the sill and draw a line all 
along the sill. This is where 
the back of the JELD-WEN 
drain mat will sit.
PREPARE WINDOW
5
SEPARATELY SUPPLIED DRIP CAP 
SEAL WINDOW 
This step applies to nail n 
units only, windows with 
exterior trim will install drip 
cap in section 6, “INSTALL 
WINDOW.”
Lay a 1/4" bead of sealant 
across the header as shown, 
and tap the drip cap into the 
groove with a wood block.
Header
INSTALL MASONRY CLIPS ON THE SILL
Note! Install clips on any 
windows that DO NOT have 
exterior trim or a n on the 
sill.
1. Install masonry clips 4" from 
eachcornerandevery16"
on center under sill with two      
#8x3/4"screwsperclip.
2.ForunitsratedaboveDP50,
runacontinuous3/8"bead
of sealant on the interior 
side of the nail n/trim 
where it will contact the 
structure.
•Forunitswithexteriortrim:runa3/8"continuousbeadofsealant
around the interior of the window where the trim meets the window 
frame. Tool into a llet shape.
Measure 
from trim 
to interior  
edge of 
frame
Interior
Width of 
rough opening
Release tape
6"
Seal 
corners
Drain mat 
strips (above 
DP50only)
Shim
4"
8"
Groove
Masonry 
Clip
Framing
Sill






