Code Compliance
Adjust Joist Spanning to Accommodate Angled Decking Patterns
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. Code Listings Trex complies with major model building codes and has been evaluated by the International Code Council evaluation service.
90°
60°
Perpendicular to joists. See chart below.
At a 60° angle, maximum joist spanning is 2 " (51 mm) less than listed in the chart below.
30°
45°
Trex Decking Span Chart (on center)
Residential 100 psf = 4.8 kN/m2
Commercial 100 psf = 4.8 kN/m2 200 psf = 9.5 kN/m2
Decking Loading
16 " (406 mm) 12 " (305 mm)
16" (406 mm)
1" (25 mm) Boards
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.
Gapping and Overhang
Width-to-Width The minimum required width-to-width
3/16" (5 mm)
You must gap Trex decking both end-to-end and width-to-width. Gapping is necessary for drainage and the slight thermal expansion and contraction of Trex decking boards. Gapping also allows for shrinkage of the wood joist system. » ALWAYS follow Trex gapping guidelines. » Maximum allowable perpendicular overhang for all Trex decking is 3/4 " (19 mm). » All decks require air circulation to keep them dry and looking good. To improve air flow, leave openings under the decking or increase gapping to 3/8 " (10 mm).
gapping is 3/16 " (5 mm). This is allowed for both hot and cold weather installations. For heavily wooded areas, Trex recommends a 3/8 " (10 mm) gap. No gapping should ever exceed 1/2 " (13 mm).
End-to-End/ End-to-Width Gap Trex decking end- to-end, based upon the temperature at installation. See chart to the left. Abutting Solid Objects
End-to-End
End-to-Width
Width-to-Width Gap - All Trex Decking Products 3/16 " (5 mm)
Trex Refuge Other Gapping Requirements End-to-End/ End-to-Width
Abutting Gap 5/16" (8 mm) 9/16” (14 mm)
Above 40°F* (4.5°C)* Below 40°F* (4.5°C)*
3/16” (5 mm) 5/16” (8 mm)
Gap Trex decking when its abutted to a wall, based on the temperature at installation. See chart to the left.
Abutting Gap
*Temperature at installation
10
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