Understanding Nominal vs. Actual Dimensions
In the lumber industry, 'nominal' dimensions refer to the size of the board before it is milled or planed. The 'actual' dimensions are what you measure when you receive the product. This distinction is particularly important when comparing Ipe 1x6 and 5/4x6 decking.
A nominal 1x6 Ipe board typically has an actual thickness of approximately 3/4 inch (0.75 inches) and an actual width of about 5 1/2 inches (5.5 inches). A nominal 5/4x6 Ipe board, on the other hand, usually has an actual thickness closer to 1 inch (1.0 inches) and the same actual width of 5 1/2 inches (5.5 inches). Always confirm the exact actual dimensions with your supplier before ordering, as minor variations can occur.
Ipe 1x6 Decking: Appearance and Common Applications
The 1x6 Ipe decking profile, with its actual 3/4-inch thickness, offers a more streamlined and contemporary look. Its thinner profile can create a less bulky appearance, which may be desirable for modern designs or areas where a lighter visual touch is preferred.
This profile is often suitable for decks built closer to the ground, or for resurfacing existing deck frames where the underlying structure is sound and joist spacing is relatively tight. It can also be used for vertical applications like railing infill or decorative elements where structural demands are lower. The 1x6 profile is a good choice for projects where a sleek aesthetic and moderate structural support are sufficient.
Ipe 5/4x6 Decking: Strength and Versatility
The 5/4x6 Ipe decking profile, with its actual 1-inch thickness, provides increased rigidity and strength compared to the 1x6. This added material makes it more resilient to deflection and can accommodate wider joist spacing.
This profile is a common choice for decks with standard joist spacing, elevated decks, or projects where higher foot traffic or heavier loads (such as large planters or outdoor furniture groupings) are anticipated. The extra thickness also offers a more substantial feel underfoot and can contribute to the perception of a more robust structure. Its versatility makes it a popular option for a wide range of outdoor decking applications, from residential patios to commercial installations.
Ipe wood itself is known for its density and durability, making it a strong choice regardless of the profile. It is naturally resistant to rot, insects, and mold, and holds up well against weather changes. This inherent strength complements the structural benefits of the 5/4x6 profile, especially for demanding projects.
Structural Considerations: Joist Spacing and Load Bearing
Thicker boards can typically span greater distances without excessive deflection.
Always consult a structural engineer or your installer to verify joist spacing requirements for your specific project and chosen profile. Incorrect joist spacing can lead to an unstable deck surface and potential safety issues.
Regardless of the thickness, proper fastening is essential for Ipe decking due to its density. Both face-fastening with pre-drilled pilot holes and approved hidden fastening systems are options, and the choice may influence the recommended joist spacing and overall stability.
Worked Example: Decking a 10x12 Foot Area
Let's consider decking a rectangular area measuring 10 feet by 12 feet. We will assume the deck boards run parallel to the 12-foot dimension, meaning each board will be 12 feet long. The actual width of both profiles is 5.5 inches.
To cover the 10-foot width (120 inches), we divide by the board width: 120 inches / 5.5 inches/board = approximately 21.82 boards. Since you cannot purchase partial boards for the length, you would need to purchase 22 boards.
The total lineal footage needed would be 22 boards * 12 feet/board = 264 lineal feet.
The total lineal footage needed would also be 22 boards * 12 feet/board = 264 lineal feet.
This example illustrates that while the lineal footage for a given area might be similar, the choice of profile directly impacts the required joist spacing and, consequently, the sub-structure design. Always account for waste when ordering, typically 5-10% extra, depending on the complexity of your deck design and the length mix of boards available.
Before you order
- Confirm actual dimensions from your supplier for both 1x6 and 5/4x6 Ipe.
- Evaluate your desired deck aesthetic: Do you prefer a sleeker or more substantial look?
- Assess your deck's structural requirements: Will it be ground-level, elevated, or subject to heavy loads?
- Consult local building codes: Are there minimum thickness requirements for decking in your area?
- Consider the fastening method: Will hidden fasteners or face screws be used, and how does this affect board choice?
- Review your budget: While the lineal footage might be similar, the 5/4x6 profile may have a higher per-foot cost due to more material.
Confirm installation details, approved uses and warranty terms in the current instructions for the exact product and profile. Your installer should verify the substrate, structure and applicable project requirements.
Questions to help you decide
What is the main difference between Ipe 1x6 and 5/4x6?
The main difference is thickness. A nominal 1x6 Ipe board has an actual thickness of about 3/4 inch, while a nominal 5/4x6 Ipe board has an actual thickness closer to 1 inch. This difference impacts structural strength and suitable joist spacing.
Does the choice of profile affect maintenance requirements?
The choice between 1x6 and 5/4x6 Ipe profiles generally does not significantly alter the inherent maintenance requirements of Ipe wood. Both profiles will benefit from occasional cleaning and optional UV-blocking oil application if you wish to preserve their original color. If left untreated, both will weather to a silvery-gray patina. The density of Ipe, regardless of profile, contributes to its low-maintenance nature.
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