Installation Guide
25 | Diamond Kote Building Products Application Guide           6.18
OPTION 2: POCKET HOLE JOINERY & 
NAIL FIN TRIM
•   Follow these steps to assemble the Nail 
Fin Trim by screwing the trim together 
using a pocket hole joinery and then 
installing the trim on the wall as a 
unitized frame. 
•   The advantage with this option is that 
the trim joints will be tighter, and should 
not require shimming to keep them ush.
•   Joints may be assembled with either 45° 
miters or butt & pass methods.
POCKET HOLE REQUIRED EQUIPMENT:
•  Pocket hole jig w/drill bit
•   2" Pocket screws (exterior grade)
•   Portable pocket hole jigs are readily 
available from retail suppliers.
INSTALL: 
•   Measure and cut the trim pieces to 
the proper length as normal, then 
touch up paint all cut ends. Be sure to 
add the proper gap amount to your 
measurements. 
(Fig. A)
•    Please  follow  the  tool  manufactures 
instructions by setting up the jig and 
drill. From our experience best results 
are obtained by setting the jig for 1" 
material and the drill depth gauge for 
¾" material using 2" screws. Because 
manufactures  dier,  nd  the  settings 
that work best for you. Experiment on a 
test piece rst.
•   Follow the hole placement diagrams 
below for your situation. Drill 2 holes for 
4" trim and 3 holes for 6" trim. Place the 
holes from the edge of the material at 
the dimensions shown for each joint to 
join the material together.
Proper hole placement is important for 
screw holding power. Caution: drilling too 
close to the edge may cause material to 
split.
•   Using  a  scrap  piece  of  the  nail  n, 
approximately 2" x 3.5" (circled), will help 
keep the trim clamped securely in the jig 
while drilling.
 (See Fig. B, C, & D)
•   After all four joints are drilled begin 
assembling the frame. 
(Fig. E)
•   Follow  recommendations 
from the manufacturer on 
installing screws with the 
trim face down. Take care 
to protect  the  pre-nished 
surface from damage during 
assembly.
•   With the pieces of trim 
assembled, take the unitized frame 
to  the  desired  area  on  the  wall,  t  the 
trim frame to the opening leaving the 
required gap between trim and opening. 
(Fig. A) Level the trim frame and fasten 
through the  nailing  n lling  every  3rd 
hole.  Nail  heads  should  set  rmly  to 
the face of the n, but be careful to not 
overdrive  to  distort  or  damage  the  n 
surface.
•   Make sure that you do not overdrive 
nails. Fasten EVERY 3RD HOLE. We 
recommend using 1-3/4" StormGuard
®
Ring shank nails from Maze Nails. 
•  Apply sealant as shown on Fig. A
•  Watch the Pocket Hole Joinery Video. 
4" Trim 45° miters
4" Trim Butt & Pass
3/4" 
2-1/4" 
1" 
1-1/2" 
6" Trim Butt & Pass
6" Trim 45° miters
2-1/4"
3/4" 
3-3/4"
3"
1-1/2" 
4-1/2"
Fig. B Fig. C Fig. D
TRIM & FASCIA     190, 440, 540 & 2000 SERIES
INSTALLATION
• Trim ends may lightly touch adjacent trim edges around windows and doors only. Re-prime and paint all cut ends.
• When installing trim around windows and over window anges, be sure to follow the window manufacturer’s installation
instructions.
• All openings must be properly sealed and ashed in a manner that prevents moisture intrusion or buildup. Flashing may be
sealed to the water-resistive barrier by using adhesive ashing or housewrap tape.  (See ALL diagrams)
• When trim is installed adjoining vinyl siding, install Z-ashing with a 4 inch upper leg between horizontal trim and J-channel.
(See diagram 8a)
• Horizontal trim or bands shall be ashed with a sloped metal Z-ashing to redirect water away from the wall assembly.
GENERAL REQUIREMENTS (CONTINUED)
7a
7b
Windows, Doors and Openings
7c
7d
7e
LP SmartSide Trim & Fascia 
7
Z-Flashing 3/8" min. 
space (do not caulk)
Sealant 
3/16"
min. space
Sealant 3/16"
min. space
Sealant 3/16"
min. space
Fig. A
Fig. E










