Spanning Requirements for Trex ® Stairs Note: English measurements are shown. Convert to metric measurements if necessary.
11" min. depth
Stringer
1/4" - 3/8" gapping
3/4" max. overhang
Fasten treads to all stringers
1” x 8" Riser
See chart below
Riser removed for clarity
36" minimum width – 4 stringers are required Above 36" width – 5 stringers are required
Stairs Stairway Detail
NOTES: » Trex rails meet all major building codes for use as a guardrail system. Local municipalities may require a graspable handrail on stairways. Check with your local building code official for local requirements. See Trex ADA Handrail System in the Trex product catalog.
» Stair treads built with Trex meet requirements of the major national building codes. Consult your local municipality for specific requirements. » Fasten stair treads continuously across at least four stringers. » See chart (to the right) for center-to-center spacing of profiles. » Dress the sides of the stringers and risers with trim or Trex fascia for a finished look. » When installing risers, use two screws per every stringer. » Fascia fasteners can only be used if fascia boards are being used for risers. If deck boards are used, recommended composite deck screws must be used (glue is not required for this application). » Most model building codes require the stair treads to be constructed under the following requirements: › Stairways must be at least 36" wide* › Stair treads must be at least 11" deep » Gapping between Trex boards on stair treads must be 1/4"–3/8". » The overhang of the stair tread is not to exceed 3/4". *For railings that are installed directly over stair treads, the stair treads may need to be larger than 36" wide. Refer to local building code regulations for details prior to installing stairs and railings.
Maximum Spacing on Center of Stair Stringer
12"
Signature and Transcend 1" x 6"
Select, Enhance 1" x 6"
9"
12"
Transcend & Select 2" x 6"
55
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