Decking Profile
5/4x6 Decking Boards
Nominal: 5/4x6 · Actual: 1" x 5-1/2"
Dimensions
Nominal Size
5/4x6
Actual Size
1" x 5-1/2"
Recommended Joist Spacing
16" O.C. standard (up to 24" O.C. for dense hardwoods)
Lumber is sold by nominal size but the actual dimensions are smaller due to milling and drying.
Overview
5/4x6 (five-quarter by six) is a premium decking profile that provides extra thickness compared to standard 1x6 boards. At 1 inch actual thickness, 5/4 stock offers increased stiffness, improved fastener holding power, and a more substantial feel underfoot. This profile is the standard for pressure-treated and cedar decking, and is increasingly popular for exotic hardwoods where the extra thickness allows wider joist spacing up to 24" on center.
Available Species
Best Uses
- Standard residential decking in pressure-treated and cedar
- Projects requiring wider joist spacing (up to 24" O.C. with hardwoods)
- Elevated decks where added stiffness is beneficial
- High-traffic commercial installations
- Stairs and treads where extra thickness improves safety
Installation Tips
- 1Space boards 3/16" apart for drainage and seasonal movement
- 2Pre-drill all hardwood species; softwoods may be face-screwed directly
- 3Stagger end joints at least 2 joist bays apart
- 4For stairs, overhang treads 1" beyond the riser for a clean look
- 5Allow acclimation time on-site before installation (5-14 days)
Fastener Recommendations
- Hardwoods: Stainless steel screws with pre-drilling
- Softwoods: #8 or #10 coated deck screws, 2-1/2" to 3" length
- Hidden fasteners: All major clip systems are compatible with 5/4 stock
- Composite shims can be used under clips for fine height adjustment
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