Installation Guide
50
DESIGNER RAILING
Measuring and 
Cutting Railings  
4.  Measure and cut top 
  a
nd bottom rails to fit 
  between posts. Leave 
  1
/16" (0.15 cm) gap at 
  each end for cold 
  w
eather expansion.
Assembling Rails with Balusters
5.  Place bottom rails on their sides, lip sides facing up.  
  U
sing TrexExpress
™
 Designer Series Railing 
  A
ssembly Tool, set balusters in designated slots. 
NOTE: Using two assembly tools and overlapping these 
will allow you to span the entire length of the railing 
section for a 6' (1.83 m) span.  
  I
nsert balusters into top rail’s channels, align 
  bottom rails parallel to top rails with balusters at 
  e
qual distance from both ends.
NOTE: If assembly tool is not available, maximum 
spacing for balusters is 5" (12.7 cm) on center or 3-5/8" 
(9.2 cm) between balusters.
Securing Balusters to Bottom Rail
6.  Move TrexExpress
™
 Designer Series Railing 
  A
ssembly Tool to bottom rail and hold balusters in  
  contact with rail lip. Secure balusters to bottom rail  
  w
ith 2" (5.1 cm) 16 gauge finishing nails through  
  underside of bottom rail. 
NOTE: For added stability, drill pilot holes and use 
#8 - 2" (5.1 cm) screws to secure balusters. 
Securing Balusters to Top Rail
7.  Slide TrexExpress
™
 Designer Series Railing 
  A
ssembly Tool to top rail and check alignment of 
  balusters. Secure balusters with 2" (5.1 cm) 
  1
6 gauge finishing nails through side of rail. 
NOTE: For added stability, drill pilot holes and use 
#8 - 2" (5.1 cm) screws to secure balusters or nail 
thru both sides of the top rail. A
L
WAYS hold nail gun 
perpendicular to baluster to be sure the nail drives 
securely into baluster.
4
1
1
5
1
1
6
2
HOW TO INSTALL STANDARD RAILING/CONTINUED
TREX DESIGNER SERIES
1
1
1
7
2
51
DESIGNER RAILING
HOW TO INSTALL STANDARD RAILING/CONTINUED
DESIGNER STANDARD
2
10
3
1
1
1
9
x2
3
2
Top 
Rail
Top 
Rail
Bottom 
Rail
Bottom 
Rail
18"
(45.7 cm)
3-1/2" to 4"
(8.9 cm to 10.2 cm)
8
Attaching Foot Blocks
8.  Measure distance from deck surface to top of 
  c
hannel in bottom rail, approximately 3-1/2" - 4" 
  (8.9 cm - 10.2 cm). Secure foot blocks with 
2" (5.1 cm) 16 gauge finishing nails through side 
  of bottom rail.
NOTE: 2" (5.1 cm) screws can also be used. Pre-drilling 
would be required.
NOTE: Foot blocks are required every 18" (45.7 cm) for 
Designer Series Railing.
Securing Railings to Posts 
9.  Place assembled railing section on RSBs on posts 
  a
nd secure top rail with two 1-1/2" (3.8 cm) screws. 
  S
ecure bottom rail with screws through top of rail 
  and into the outermost hole in RSBs. 
  Bottom rail can also be secured to posts with 
  1
6 gauge finishing nails, toenailed from bottom of 
  rail and 1" (2.5 cm) in from the posts.
Finishing Post
10. Posts and post sleeves can be trimmed but this is 
n
ot a requirement. Make sure tops of posts are level.  
  Secure post caps with construction-grade adhesive.  
  C
lean-up any excess adhesive before drying.  










