Cumaru, also known as Brazilian Teak or Golden Teak, is a naturally durable Brazilian timber with a density similar to Ipe. Its consistent golden brown color and moderate cost make it an attractive alternate to more expensive hardwoods such as Teak or Ipe. Cumaru is resistant to rot and decay, making it an excellent choice for exterior applications such as decking. It not only lasts a long time, but has the beauty of an interior hardwood. It outlasts other popular wood decking species such as treated Pine, Cedar, Redwood and Douglas Fir.

Thompson Mahogany stocks standards Cumaru decking (Brazilian Teak) sizes, and offers custom millwork for special profiles or sizes. Cumaru deck facing is partially air-dried (AD), and then kiln-dried (KD) to approximately 15% moisture content for stability.   Thompson Mahogany also stocks all the accessories – fasteners, sealers, cleaners, and finishes  – to complete your deck.

Cumaru Decking Railing Profiles

Thompson Mahogany offers the following stock Ipe railing profiles:

Sub-Rail

Use this profile for the top and bottom runners of your railing. Screw your 2×2’s or balusters in place between these boards.

Ipe Subrail

Rail Cap – Flat Top

Use this profile for the top hand rail by fastening it from underneath through the sub-rail.

Ipe Railcap Flat

Rail Cap – Curved Top

Use this profile for the top hand rail by fastening it from underneath through the sub-rail.

Ipe Railcap Round

Hand Rail

Use this profile for small handrail or stair cases.

Ipe Handrail

Handrail Assembly
This cross-diagram and photo shows how to assemble the handrail parts.

We can custom-mill various profiles and sizes by request, please call for details and pricing.

Sizes – Cumaru decking typically runs in even lengths from 8′ to 20′. Depending upon the dimension, we may have shorter stock – “shorts” – from 2′-6′, as well as longer pieces up to 22′. Please call or contact us to find out our current stock levels, sizes and lengths available as they vary at any given time. We also have millwork services for special sizes or profiles.

Wholesale Minimums – Thompson Mahogany does not require minimum orders for its decking. Stocking program customers as well as non-stocking customers may buy in units or job lots through our “One Deck at a Time™” program. Please note that there is a price difference in wholesale unit orders and wholesale job lot orders. Contact us for pricing details.

Wholesale Ipe Decking Stock Information

4/4

Nominal SizeNet SizeGradesDryingLengths
1 x 43/4" x 3-1/2"Premium, FASKD7’ - 20’ Odd & Even
1 x 4 tongue and groove11/16" x 3" FacePremium, FASKD7’ - 20’ Odd & Even
1 x 63/4" x 5-1/2"Premium, FASKD7’ - 20’ Odd & Even
1 x 83/4" x 7-1/4"Premium, FASKD7’ - 20’ Odd & Even

5/4

Nominal SizeNet SizeGradesDryingLengths
5/4 x 41" x 3-1/2"Premium, FASKD7’ - 20’ Odd & Even
5/4 x 4 tongue and groove7/8" x 3" FacePremium, FASKD7’ - 20’ Odd & Even
5/4 x 4 Pre-Grooved1"x 3-1/2"Premium, FASKD7’ - 20’ Odd & Even
5/4 x 61" x 5-1/2"Premium, FASKD7’ - 20’ Odd & Even
5/4 x 6 Pre-Grooved1" x 5-1/2" PGPremium, FASKD7’ - 20’ Odd & Even

8/4

Nominal SizeNet SizeGradesDryingLengths
2 x 41-1/2" x 3-1/2"Premium, FASKD7’ - 20’ Odd & Even
2 x 61-1/2" x 5-1/2"Premium, FASKD7’ - 20’ Odd & Even
Cumaru Plugs3/8" diameterPremium, FASKD5/16" - 3/8"

TMC understands that your customers want to buy everything for the project in one place if possible. That’s why we offer all the accessories in job-lot quantities so you don’t have to buy a pallet of stain just to complete an order. We keep the following accessories in stock:

Cumaru Decking / Wood Frequently Asked Questions (FAQ)

What spans can I expect from Cumaru?

Due to the strength of Cumaru, you can expect the following spans:

  • 1x (net 3/4″) – up to 16″ on center
  • 5/4x (net 1″) – up to 24″ on center
  • 2x (net 1-1/2″) – up to 32″ on center
  • Diagonal patterns may require shorter joist spacing

We recommend that you check with your local building code before deciding on joist spans.

What grades of Cumaru do you sell?

Thompson Mahogany Company provides “premium” all heart grade which gives a truly outstanding appearance.  Our decking boards come  “three sides clear” (one clear face and two clear edges).

Can Cumaru be installed on existing SYP pressure treated framing?

Yes, although we recommend that a professional inspect the integrity of the existing framing to ensure it is stable, usable and passes your current city code requirements.  We carry the necessary component parts to frame the undercarriage of Ipe decking.

Can Cumaru be painted?

It is our experience that due to the wood’s density, oily nature and alkalinity, Cumaru does not accept most paints.  For more details on painting Cumaru, please contact us to discuss.

How do I maintain that original golden brown, rich color?

Cumaru will weather to a silver patina if you leave it in its natural state.  Depending upon your exterior conditions, it can noticeably turn within a few months and can be fully gray within a year.  Should you wish to keep the wood rich and golden brown, apply an oil-based UV inhibitor finish specifically designed for hardwoods such as Ipe.  There are numerous available brands, and we recommend Messmer’s UV Plus for Hardwood Decks.

Species Information

Cumaru (Brazilian Teak, Golden Teak)

BOTANICAL NAME: Dipteryx odorata

Family:  Apocynaceae

Other Common Names: Brazilian Teak (USA), Golden Teak (USA), Almendro (Costa Rica, Panama), Sarrapia (Venezuela, Colombia), Cumaru (Brazil), Charapilla, Cumarut (Peru).

Distribution: The Guianas, Venezuela, Colombia, and the Amazon region of Brazil; reaches its best development on well-drained gravelly or sandy sites.  Cultivated in many areas for the tonka beans used as a flavoring.

The Tree: A large overstory tree sometimes to 160 ft in height and trunk diameters to 40 in.; unbuttressed cylindrical boles are generally clear to 60 to 80 ft.

General Characteristics: Fresh heartwood is reddish brown or purplish brown with light yellowish-brown or purplish streaks; upon exposure gradually’ becomes uniform light brown or yellowish brown.  Sapwood is distinct, narrow, yellowish brown. Luster rather low to medium; texture fine; grain interlocked; waxy or oily feel; taste not distinctive but may have a vanilla-like or rancid odor.

Weight: Basic specific gravity (ovendry weight/green volume) ranges from .80 to .91; air-dry density 62 to 81 pcf.

Mechanical Properties:

Moisture Content (%)
Bending Strength (PSI)
Modulus of Elasticity (1000 PSI)
Maximum Crushing Strength (PSI)
Green (74) 19,290 2,690 9,020
12% 27,270 3,030 13,720
12% (24) 27,400 3,010 13,200

[space height=”15″]Janka side hardness is approximately 3,540 lb. at 12% moisture content.

Drying and Shrinkage:  The wood is rated as easy to air-season with a slight tendency to check and with moderate warping; drying was uniformly rapid.  No dry kiln data available.  Shrinkage from green to ovendry: radial 5.0%; tangential 7.6%; volumetric 12.0%.

Working Properties: The wood is difficult to saw and bore; where severely interlocked grain is not present, the wood planes to a smooth surface.  Because of its high density and oily nature, the wood glues poorly.

Durability: The timbers have a reputation for being very durable.  Laboratory tests also show the heartwood to be very durable in resistance to both brown-rot and white rot fungi.  The wood has excellent weathering characteristics.

Preservation:  Does not need preservation.  The heartwood is reported to be extremely resistant to preservation treatments.

Uses:  Heavy construction, cogs and shafts, barge and dock fenders, flooring, railroad crossties, pulp mill equipment, tool handles, bearings, turnery.