Code Compliance
Joist Spanning for Decking Trex decking meets all applicable national model building codes. The joists must be spaced on center according to the chart below. Be sure that joists are level and plumb. Trex decking must span at least three joists. For heavy items such as hot tubs, planters, etc., consult a local building engineer or inspector for span recommendations. If you want to minimize the appearance of joists through the spaces between boards, paint the top of your joists black. Code Listings Trex complies with major model building codes and has been evaluated by accredited third-party testing agencies. For areas that require CCMC Evaluation, refer to the Trex Canadian Decking Installation Guide.
Adjust Joist Spanning to Accommodate Angled Decking Patterns
90°
60°
At a 60° angle, maximum joist spanning is 2 " (51 mm) less than listed in the chart below.
Perpendicular to joists. See chart below.
For a Safety Data Sheets (SDS), please visit www.trex.com.
30°
45°
At a 45° angle, maximum joist spanning is 4 " (102 mm) less than listed in the chart below.
At a 30° angle, maximum joist spanning is 1/2 of the distance listed in the chart below.
Trex Decking Span Chart (on center)
Residential Decks, Light Duty Docks, Residential/Day Care Playground
Commercial Decks, Boardwalks and Marinas
Decking Loading
100 psf = 4.8 kN/m2
100 psf = 4.8 kN/m2 200 psf = 9.5 kN/m2
1" (25 mm) Boards, and .875" (22 mm) Select Boards
16 " (406 mm)
12 " (305 mm)
16" (406 mm)
2 " x 6 " (51 mm x 152 mm) Boards
24 " (610 mm)
24 " (610 mm)
16 " (406 mm)
Trex Railing Span Chart
Maximum Railing Span for all Applications
Transcend, Select, and Signature railing
96" (2438 mm) clear span for Trex Signature and Transcend, 72" (1829mm) clear span for Select
42
NOTE: Construction methods are always improving. Please refer to www.trex.com for the most up-to-date installation requirements.
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