Cumaru Siding

Premium cumaru siding boards for residential and commercial projects

Janka

3,330 lbf

Density

64 lbs/ft³

Fire Rating

Class A

Durability

20+ years

Origin

Brazil

Color

Golden brown

Overview

Cumaru siding offers the performance of an ultra-hard exotic hardwood at a more accessible price point than Ipe. With a Janka hardness of 3,330 lbf and natural oils that resist decay, mold, and insects, Cumaru cladding delivers 20+ years of durable, beautiful exterior protection. Its warm golden-brown to reddish-brown color creates a striking facade that complements both modern and traditional architecture. For builders seeking exotic hardwood performance without the Ipe premium, Cumaru is the smart choice.

Learn more about this wood species on our Cumaru wood guide.

Benefits of Cumaru Siding

Exceptional hardness — 3,330 lbf Janka, nearly as hard as Ipe

Natural oils resist rot, decay, mold, and insects

Class A fire rating

20+ year lifespan for exterior siding

More affordable than Ipe siding with comparable performance

Warm golden-brown to reddish-brown color

Excellent dimensional stability

Suitable for rainscreen and ventilated facade systems

Sizes Available

1x4 T&G Siding

1x6 T&G Siding

1x4 Shiplap

1x6 Shiplap

1x6 Channel Siding

5/4x6 Rainscreen

Custom profiles available

Custom sizes and lengths available. Request a custom quote.

Installation Tips

Pre-drill all fastener holes — Cumaru is extremely hard.

Use stainless steel screws or approved hidden clip systems.

Install over a rainscreen furring strip system for ventilation.

Allow 1/16" to 1/8" gap between boards for expansion.

Seal all cut ends immediately with end-sealer.

Acclimate boards on-site for 5-7 days before installation.

Maintenance

Cumaru siding requires minimal maintenance. Apply a UV-protective hardwood oil annually to maintain the warm brown color, or allow it to weather naturally to silver-gray. The natural oils in the wood provide ongoing protection regardless of surface finish. Clean with mild soap and water as needed. No painting or chemical treatment required.