What gap is required at Butt joints?
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Thank you for contacting Trex! For butt joints, where boards meet over a single joist, add a 2" x 4" “nailer" board at the butt joint. This allows screw-in at 90 degrees and allows fasteners to be used at end of each board. It also allows adequate space for the required 1/8" end-to-end gapping. I hope this information is helpful! - Kindly, Trex Customer Care Team
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