SPANNING REQUIREMENTS FOR TREX STAIRS
NOTE: Shown with wood framing.
279 mm min. depth
Stringer
6 mm gapping
19 mm max. overhang
Fasten treads to all stringers
184 mm x 14 mm Riser
Trex fascia or trim
See chart below
Riser removed for clarity
900 mm minimum width – 4 stringers are required Above 900 mm width – stringers at 300 mm centres
MAXIMUM SPACING OF STAIR JOISTS (Centre-to-Centre)
For approved AU spans, refer to https://au.trex.com/trex-owners/downloads/ and view detailed span tables provided by SOTO Engineering located under Evaluation Service Reports.
18 NOTE: Construction methods are always improving. Please refer to www.trex.com for the most up-to-date installation requirements.
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