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Soffit

5/4x4 Cumaru Rainscreen Soffit

This 5/4x4 Cumaru soffit board (Rainscreen profile) combines the rich grain of Cumaru (Brazilian Teak) with 3,330 Janka hardness, making it ideal for exposed eave linings and covered ceilings that endure for decades. The rainscreen profile is designed for ventilated clip systems, allowing airflow behind the cladding for superior moisture management on eave linings, ceilings, and covered areas. In stock and ships nationwide — order 5/4x4 Cumaru soffit boards online or call 1-844-674-4455 for expert guidance.

5/4 x 4(1"×3.5" actual)[25.4mm × 88.9mm]
Contractor Trusted
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Ships Nationwide
SKU: CUMA-54X4-RAIN-SB-L1

Configure Your Order

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

Rainscreen

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:1.70 lbs/LF
1' board:1.7 lbs

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5/4x4 Cumaru Rainscreen Soffit — Complete Buyer's Guide

Cumaru, also known as Brazilian Teak, is a premium tropical hardwood sourced from Amazon Basin, northern South America (Brazil, Venezuela, Guyana). With a Janka hardness rating of 3,330 lbf and a density of 65 lbs/ft³, Cumaru is classified as Class 1 - Very Durable — one of the most durable commercial lumber species available. The heartwood exhibits light to medium brown with reddish tones with interlocked grain, medium to coarse texture, creating a striking natural appearance that improves with age.

Why Choose 5/4x4 Cumaru Wood for Your Soffit?

Cumaru soffit and porch ceiling boards create a warm, premium overhead aesthetic that vinyl and aluminum simply cannot replicate. The natural grain pattern adds architectural character to any covered outdoor space. Properly installed 5/4x4 Cumaru soffit delivers a service life of 50+ years with minimal maintenance — an optional annual oil treatment preserves the original color, or you can let the Cumaru wood weather to a distinguished silver-gray patina. Cumaru carries a Class A - Low flame spread, making it suitable for wildfire-prone regions where code-compliant materials are required.

The 5/4x4 rainscreen profile is engineered for open-joint cladding systems with ventilation gaps behind the boards. This modern system manages moisture while creating a striking contemporary facade. All Cumaru lumber is available in Select and Better grade with lengths ranging from 4′ to 20′. For detailed step-by-step instructions, consult our Cumaru installation guide. Long-term care recommendations are covered in our Cumaru maintenance guide.

5/4x4 Cumaru Soffit — Installation & Coverage Specs

  • Recommended joist spacing: 16"–24" on center for 5/4x4 boards (1" actual thickness)
  • Fastener placement: Secure per profile requirements, one fastener per joist minimum
  • Board weight: A 12-foot 5/4x4 Cumaru board weighs approximately 20 lbs (1.65 lbs/LF)
  • Coverage: Each 12-foot 5/4x4 board covers 3.5 sq ft of soffit surface (3.5" face width)
  • Pre-drilling required: Always pre-drill in Cumaru — the 3,330 lbf hardness prevents direct screwing

Janka Hardness

3,330 lbf

Service Life

50+ years

Durability

Very Durable

Fire Rating

Class A

5/4x4 Cumaru Soffit — Frequently Asked Questions

5/4x4 Cumaru soffit has an expected service life of 50+ years when properly installed and maintained. This is 3-5x longer than pressure-treated pine and 2-3x longer than cedar. Cumaru achieves this exceptional longevity through its natural density (Janka hardness: 3,330 lbf) and Class 1 durability rating, which provide built-in resistance to rot, decay, insects, and fungal growth — all without chemical preservatives.

Use 305 or 316 stainless steel screws for all Cumaru installations — never use galvanized or coated deck screws, which will corrode and stain the wood. Pre-drill every hole using a countersink bit sized for your screw. For 5/4x4 boards, place screws approximately 1" from each edge and 3/4" from board ends. A combination drill/driver with a clutch setting prevents over-driving into this extremely hard wood.

5/4x4 Cumaru soffit pricing varies by profile, grade, and board length. 5/4x4 Rainscreen 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, Cumaru's 50+ 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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