5/4x6 Ipe Tongue & Groove Siding board profile diagram
Siding

5/4x6 Ipe Tongue & Groove Siding

This 5/4x6 Ipe Tongue & Groove siding board offers unmatched exterior cladding longevity, backed by Ipe's 3,680 Janka hardness and a natural lifespan of up to 75+ years. The interlocking tongue and groove profile creates tight, seamless joints for exterior cladding and accent walls, with no visible fasteners on the finished surface. In stock and ships nationwide — order Ipe siding online or call 1-844-674-4455 for expert guidance.

5/4 x 6(1"×5.5" actual)[25.4mm × 139.7mm]
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Ships Nationwide
SKU: IPE-54X6-TG-SB-L1

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Select profile, grade, and length below to see live pricing

Durable, Weather-Resistant, and Aesthetic Solution for Exterior Applications

T&G

Select and Better is our standard grade

Length Guide

Available lengths: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22′

Estimated Shipping Weight
Weight per linear foot:2.67 lbs/LF
1' board:2.7 lbs

5/4x6 Ipe Tongue & Groove Siding — Complete Guide

Everything you need to know about t&g ipe siding

About 5/4x6 Ipe Tongue & Groove Siding

Ipe lumber, particularly in a tongue-groove profile and 5/4x6 size, represents an ideal choice for exterior siding and cladding applications. Known for its exceptional dimensional stability and superior resistance to weathering, Ipe provides both functional and aesthetic advantages. The tongue-groove profile enhances the overall appearance by allowing for clean, seamless joints that create visually appealing shadow lines. This design feature facilitates optimal orientation options, permitting installation both vertically and horizontally, depending on design preferences.

  • Exceptional weather resistance and dimensional stability.
  • Tongue-groove profile enhances aesthetics and installation ease.
  • Ideal for vertical or horizontal cladding applications.

Key Benefits

Superior Durability

Ipe lumber is highly resistant to rot, insects, and moisture exposure, ensuring long-term performance even in harsh weather conditions.

Aesthetic Appeal

The tongue-groove profile provides a clean, modern look with enhanced shadow lines, suitable for various architectural styles.

Longevity

When properly maintained, Ipe offers many years of service, making it a worthwhile investment for exterior projects.

Technical Specifications

Janka Hardness

3680

Density

69 lbs/ft³

Durability Rating

Class A (Most Resistant)

Dimensional Stability

Excellent.

Installation Guide

Difficulty:
Moderate

Key Tips:

  • Ensure proper spacing to accommodate wood movement.
  • Use stainless steel or coated fasteners to avoid corrosion.
  • Consider ventilation behind cladding for moisture control.

Recommended Tools:

Circular saw
Drill/driver
Screwdriver
Measuring tape

Maintenance & Care

Cleaning

Regularly clean with mild soap and water to remove dirt and grime. For deeper cleaning, use a wood cleaner recommended for hardwoods.

Finishing

Apply an appropriate wood finish to protect against UV rays and maintain color. Reapplication may be required every 1-2 years depending on exposure.

Weathering

Ipe may weather to a silvery-grey patina over time if left unsealed. Regular maintenance can help preserve its natural color.

Frequently Asked Questions

A 5/4x6 Ipe board weighs approximately 2.67 lbs per linear foot. Ipe has a density of about 69 lbs/ft³, making it one of the densest commercially available hardwoods. Always factor weight into your structural and shipping calculations.

Yes — Ipe is rated Durability Class 1 (Very Durable) and is naturally resistant to rot, decay, insects, and fungal attack without chemical treatment. It is Class A fire-rated and performs exceptionally well in full exterior exposure including siding applications. While ground contact is possible, we recommend elevating Ipe boards at least 6" above grade for maximum lifespan.

Ipe outperforms composite in hardness (3,680 vs ~200 Janka), lifespan (up to 75+ years vs 25-30 years), and heat resistance. Unlike composites, Ipe won't melt, warp in extreme heat, or fade significantly. While initial cost is similar ($8-15/LF installed), Ipe costs less over its much longer lifetime. Composites do offer lower upfront maintenance.

Ipe requires minimal maintenance. Without treatment, it naturally weathers to an elegant silver-gray patina over 6-12 months. To maintain the original warm brown color, apply a UV-inhibiting penetrating oil (like Ipe Oil or Penofin) once or twice annually. Cleaning involves periodic washing with a mild soap solution. No sanding, staining, or sealing is required for structural durability.

Ipe is DIY-friendly with proper preparation. Key requirements: (1) Always pre-drill all screw holes — Ipe is too hard for direct screwing. (2) Use only 305 or 316 stainless steel fasteners — standard hardware will corrode and stain. (3) Face-screw with stainless steel trim-head screws. (4) Allow boards to acclimate on-site for 5-7 days before installation. A compound miter saw with a carbide-tipped blade is recommended.

A nominal 5/4x6 Ipe board has actual finished dimensions of 1" × 5.5" (25.4 x 139.7 mm). The "5/4x6" is the nominal (rough-cut) size — after kiln drying and precision surfacing, all hardwood lumber finishes slightly smaller. This is standard across the lumber industry, similar to how a nominal 2×4 softwood measures 1.5" × 3.5". Always use the actual dimensions (1" × 5.5") when calculating material quantities and coverage for your project.

We responsibly, legally, and ethically source all our Ipe. We work only with suppliers who follow responsible forestry practices with full chain-of-custody transparency. Note: We are not FSC certified. Ipe trees grow naturally in diverse tropical forests and regenerate well under managed harvest. The extremely long lifespan (up to 75+ years) means fewer replacements compared to softwood or composite alternatives, reducing long-term environmental impact.

Shipping & Delivery

Nationwide delivery: We ship to all 50 states via LTL freight, flatbed, or terminal pickup

Typical lead time: 5-10 business days for standard orders (custom milling may add 2-3 weeks)

Shipping estimate: Final freight cost calculated at checkout based on your location and order size

Rush service available: Contact us for expedited milling and shipping options

5/4 x 6 Ipe Tongue & Groove Siding — Complete Buyer's Guide

Ipe, also known as Brazilian Walnut, is a premium tropical hardwood sourced from Central and South America (Brazil, Bolivia, Peru). With a Janka hardness rating of 3,680 lbf and a density of 69 lbs/ft³, Ipe is classified as Class 1 - Very Durable (Up to 75+ Years) — one of the most durable commercial lumber species available. The heartwood exhibits rich brown to olive-brown, darkening to reddish-brown with age with interlocked to irregular grain, fine to medium texture, creating a striking natural appearance that improves with age.

As exterior cladding, Ipe siding provides a weather-tight barrier with exceptional impact resistance. The dense grain resists dents, hail damage, and woodpecker damage far better than cedar, pine, or fiber cement alternatives. Properly installed Ipe siding delivers a service life of 75+ years with minimal maintenance — an optional annual oil treatment preserves the original color, or you can let the wood weather to a distinguished silver-gray patina. Ipe carries a Class A (0-25 flame spread), making it suitable for wildfire-prone regions where code-compliant materials are required.

The 5/4 x 6 tongue & groove (T&G) profile features interlocking edges that create a seamless, flush surface with no visible gaps. Ideal for porch ceilings, soffit installations, and covered porch floors. All Ipe lumber is available in Select and Better grade with lengths ranging from 4′ to 20′. For detailed step-by-step instructions, consult our Ipe installation guide. Long-term care recommendations are covered in our Ipe maintenance guide.

Janka Hardness

3,680 lbf

Service Life

75+ years

Durability

Very Durable (Up to 75+ Years)

Fire Rating

Class A (0-25 flame spread)

5/4 x 6 Ipe Siding — Frequently Asked Questions

Ipe siding has an expected service life of 75+ years when properly installed and maintained. This is 3-5x longer than pressure-treated pine and 2-3x longer than cedar. Ipe achieves this exceptional longevity through its natural density (Janka hardness: 3,680 lbf) and Class 1 durability rating, which provide built-in resistance to rot, decay, insects, and fungal growth — all without chemical preservatives.

5/4 x 6 tongue & groove Ipe boards interlock via a milled tongue on one edge and a corresponding groove on the other. Secure each board by blind-nailing through the tongue at a 45° angle using stainless steel ring-shank nails or by face-screwing with countersunk stainless steel screws. Always pre-drill holes in Ipe to prevent splitting. T&G Ipe should only be used in covered or semi-protected areas.

Ipe siding pricing varies by size, profile, grade, and board length. 5/4 x 6 Tongue & Groove boards in Select and Better grade typically range from $4-$12 per linear foot before shipping. While the upfront cost is higher than pressure-treated lumber, Ipe's 75+ years service life makes the lifetime cost per year significantly lower. Use our online configurator above to see exact pricing for your selected options, or request a custom quote for large orders.

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