Installation Guide
116
TREX
®
 SIGNATURE™ RAILING
NOTE: Construction methods are always improving. Please refer to www.trex.com for the most up-to-date installation requirements.
ATTACHING STAIR RAILS IN CROSSOVER POST APPLICATIONS
TREX
®
 SIGNATURE™
Cutting Top Stair Rail and Insert
For Stair Post-to-Stair Crossover Post Configuration
When Using Fixed Stair Brackets:
9a. Top stair rail along with rail insert must be cut 
differently on each side of the rail. Railing side 
that attaches to standard post should be cut 1/4" 
(0.6 cm) shorter than the mark to allow for fit into 
top rail bracket. Railing side that attaches to the 
crossover post should be cut directly on the mark 
to allow for fit into the crossover post bracket.
When using Upper Stair Swivel and Stair Crossover 
Swivel Brackets:
9b. When going from standard stair post to stair 
crossover post, measurement must be taken from 
inside of top horizontal stair swivel bracket to 
inside lip of stair crossover bracket. Crossover post 
will need to be modified to have swivel crossover 
bracket installed.
Cutting Top Stair Rail and Rail Insert
For Stair Crossover Post-to-Stair Crossover Post 
Configuration
10.  Cut each end of the top stair rail along with rail 
insert on the mark line to allow for fit into the 
crossover post bracket on each side.
Cutting Top Stair Rail Cover, and Attachment of Top 
Stair Rail Cover
11.   Mark and cut top rail 
cover same length as 
top rail for all top rail 
configurations.
12. Attach “crowned" upper stair rail cover to upper 
stair rail by aligning cover on one side of rail. Then, 
starting from one end of stair rail, snap cover onto 
opposing slot working down length of stair rail. 
GENTLY tapping with a rubber mallet may facilitate 
fastening.
9a
1/4"
(0.6 cm)
1/4"
(0.6 cm)
KEY
Mark
Cut
KEY
Top stair rail
Crossover post
Standard post
9b
Crossover
post
Standard
post
Standard
post
11
10
KEY
Mark
Cut
KEY
Top stair rail
Crossover post
 Crossover post
1
12
3
2










