1x6 vs 5/4x6 Ipe Decking: Which Thickness Is Right for Yo...

Compare 1x6 and 5/4x6 Ipe decking — learn when to use each thickness, how it affects your budget, and which is the right choice for residential vs commercial projects.

1x6 vs 5/4x6 Ipe Decking — Which Thickness Is Right for Your Project?

Choosing between 1x6 and 5/4x6 Ipe decking comes down to how the deck will be used, not just what it costs. This guide explains the real-world differences between these two board thicknesses so you can make the right choice for your project.

Quick Summary

1x6 Ipe (3/4" actual thickness) — the residential standard for backyard decks, patios, siding, soffit, and fencing
5/4x6 Ipe (1" actual thickness) — the commercial and marine standard for docks, boardwalks, pool decks, and heavy-traffic areas
5/4 boards cost roughly 30% more per linear foot than 1x6 due to the additional wood
Both sizes are available in Eased-Edge, Pregrooved, and Tongue & Groove profiles
See live pricing for all ipe sizes and profiles on our Pricing page

What the Sizes Mean

1x6 and 5/4x6 are nominal lumber dimensions. Here's what you actually get:

1x6: Actual thickness 3/4" (19mm), actual width 5.5". See our Ipe Wood Sizes Guide for the full nominal-vs-actual chart.
5/4x6: Actual thickness 1" (25mm), actual width 5.5".

Both sizes are available with Eased-Edge (E4E) for face-screwing, Pregrooved for hidden clip systems like the DeckWise Ipe Clip, or Tongue & Groove for tight-seam applications.

When to Use 1x6 Ipe Decking

Browse 1x6 Ipe options →

1x6 is the right choice for most residential projects:

Backyard decks and patios with standard foot traffic
Siding, soffit, fencing, and outdoor flooring where structural load is carried by framing, not the boards themselves
Any project with 16-inch on-center joist spacing (the residential standard)
DIY installations where lighter weight makes handling easier

Why homeowners choose 1x6: Same Janka hardness (3,680 lbf), same Class A fire rating, same 50+ year lifespan — at a lower material cost.

When to Use 5/4x6 Ipe Decking

Browse 5/4x6 Ipe options →

5/4x6 is the standard specification for demanding applications:

Commercial decks with heavy foot traffic
Dock decking and boardwalks exposed to marine conditions
Pool decks and public installations
Projects requiring wider joist spacing (up to 24" on center in some applications)
Applications where extra rigidity and underfoot stability matter

Why contractors specify 5/4: 33% more wood means less flex, better span capability, more material to weather over decades, and superior screw holding power.

Pros and Cons at a Glance

1x6 Advantages

Lower material cost (roughly 30% less per linear foot)
Lighter weight — easier to handle and install
Versatile — works for decking, siding, soffit, fencing
Same hardness, durability, and fire rating as 5/4

1x6 Limitations

Requires 16" on-center joist spacing — cannot span wider
Thinner profile means slightly less material available for sanding over decades
Not recommended for heavy commercial or marine applications

5/4x6 Advantages

Greater rigidity and better span capability
Preferred for docks, boardwalks, and public spaces
More material to weather before replacement in extreme conditions
Better fastener holding power in face-screw applications

5/4x6 Limitations

Higher material cost
Heavier boards (Ipe weighs ~68 lbs/cu ft) — more physically demanding to handle
Requires more powerful tools for cutting and pre-drilling

How Thickness Affects Your Project Budget

The material cost difference between 1x6 and 5/4x6 is roughly 30% per linear foot. For a typical 400 SF residential deck, that translates to approximately $2,500–$3,000 more in board material for 5/4x6 vs 1x6.

However, material is only one part of your total project cost. Substructure framing, labor, fasteners, and finishing products are the same regardless of board thickness. The thicker boards add roughly $6–$8 per square foot to your material line item.

For current per-linear-foot pricing on every ipe size and profile:

See live ipe pricing →
Request a custom quote with your project dimensions

For full installed cost estimates (material + labor + substructure), see our Ipe Deck Installed Cost Guide.

Installation Considerations

Joist Spacing: 1x6 requires 16" on center maximum. 5/4x6 can handle up to 24" on center in some applications, but 16" is still recommended for residential decks.
Fastening Methods: Both sizes work with face-screwing (E4E) or hidden fastener systems (Pregrooved). Use stainless steel screws or the DeckWise Ipe Clip system.
Pre-drilling is mandatory: Ipe's 3,680 Janka hardness requires pre-drilling for every fastener. See our complete Ipe Installation Guide for step-by-step instructions.
End sealing: Seal all cut ends immediately to prevent checking. See our accessories page for end grain sealers.
Acclimation: Allow boards to acclimate on-site before installation — use our Acclimation Calculator.

Common Mistakes to Avoid

Over-spanning joists with 1x6: Never exceed 16" on center. Sagging is permanent.
Skipping pre-drilling: Ipe will split without pilot holes. Always pre-drill with a countersink bit.
Using incorrect fasteners: Use only stainless steel (305 or 316) screws or clips. Galvanized fasteners will corrode and stain. See our fastener comparison guide.
Not sealing end grain: Freshly cut Ipe dries rapidly at the ends, causing checks. Apply end grain sealer within 24 hours of cutting.

Maintenance — Same for Both Sizes

Both 1x6 and 5/4x6 Ipe require the same routine:

Clean annually with a hardwood deck cleaner and brightener
Oil every 1–2 years if you want to maintain the natural brown color (optional — Ipe weathers to silver-gray if left untreated)
Inspect annually for loose fasteners and surface checking
See our Deck Maintenance Guide and Ipe Deck Oil Guide for detailed instructions

With proper maintenance, both sizes last 50+ years. The 5/4 simply has more material to work with over those decades.

Our Recommendation

For residential backyard decks: 1x6 Ipe delivers the same hardness, durability, and fire rating at a lower cost. It's the smart choice for standard residential use.
For commercial, dock, or boardwalk projects: 5/4x6 Ipe is the industry standard. The extra thickness justifies the premium in high-traffic and marine environments.
On a budget? Consider Cumaru decking — roughly 30% less than Ipe with similar performance. Or explore all hardwood species to find the best fit.

Ready to get started? See current ipe pricing → or request a custom project quote →

1x6 vs 5/4x6 Ipe Decking: Which Thickness Is Right for Your Project?