Manilkara Bidentata

Massaranduba is a South American hardwood which is a very durable and hardwearing timber. It works very well as an outdoor decking material as it is rated highly against rot and insect attack.

Massaranduba is a rich coloured and patterned timber. The grain can vary from straight to interlocked and wavy, with a fine texture. The timber retains its colouring of medium to dark reddish brown heartwood, while the sapwood is a pale yellow – although sometimes the variation in colour isn’t distinguishable

Product Specifications


Caribbean, Central and South America

Tree Size:

30 – 46m

Trunk Diameter

600 – 1 200mm

Average Dried Weight:

1 080 kg/m3

Common Lengths:

1,8 – 4.8m (300mm intervals)

Common Dimensions:

19 x 90mm

21 x 40mm

Joist Spacing:

400mm CTC

400mm CTC

Easily differentiated from the other hardwood deck species, Massaranduba is a medium to dark reddish brown timber that has excellent exterior properties for decking. It is naturally resistant to insect attack and its high natural oil content gives it excellent external durability.

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Timber Comparisons

Timber is an organic product, as such, many people don’t realise that timber performance can be measured and averaged. These numbers are well documented and accessible to the consumer. They can tell you all you need to know about what to expect from a particular timber. We believe your choices should be based on fact and not perception or “hear say”. To make it easier to decipher these numbers, we have placed a table below that compares the various hardwood decking timbers On The Deck supplies. We then decipher what each analysis effectively means to your particular project.

  Pine Massaranduba Red Balau Garapa Rhodesian Teak Saligna Cumaru
Janka Hardness (lbs) 710 3 130 1 600 1 650 2 990 1 260 3 540
Dry Weight (kg/m3) 515 1 080 850 820 890 640 1 085
Modulus of Rupture (MPA) 79.2 192.2 122.3 127.8 84.3 107.8 175.1
Elastic Modulus (GPA) 10.06 23.06 16.95 15.57 8.48 14.15 22.3
Shrinkage Radial (%) 3.4 6.7 5.5 4.2 2.6 5.9 5.3
Shrinkage Tangential (%) 6.7 9.4 10.1 7.5 4.5 10.1 7.7
Shrinkage Volumetric (%) 10.7 16.8 15.7 11.4 6.9 15.5 12.6
T/R Ratio 2 1.4 1.8 1.8 1.7 1.7 1.5
Durability Class Rating Class 3* Class 1* Class 2* Class 1* Class 2* Class 3* Class 1*

* Class 1 = Highly Durable | Class 2 = Durable | Class 3 = Moderately Durable

Timber being a natural and organic material means that each and every species is different and has unique properties which makes them suitable for a range of different applications and uses. We have simplified the main properties that are measured and put it into an easy to read and simplified version so that the numbers relate back to how the timbers perform.


Massaranduba Properties

Janka Hardness

As is evident from the table, Massaranduba scores extremely high when it comes to density. It is only really timber such as Ipe or Cumaru that are more dense than this timber. The high density ensures a strong surface impervious to surface damage caused by dropping heavy objects.

Dry Weight

Once this timber is dried, it weighs almost 1.1 tons per m3. Compare this to timbers that are respected for their weight such as Rhodesian Teak, you are pushing almost another 200kg per m3.

Modulus of Rupture

It is at this point that Massaranduba out does many of its peers. The load bearing that this timber can take before it will break is exceptionally high.

Elastic Modulus

Due to the high Modulus of Rupture, it goes without saying that its Elastic Modulus is extremely high as well. This timber does not easily bend or distort.

Shrinkage and T/R Ratio

This is arguably the only weakness that Massaranduba exhibits. The timber has a fairly high volumetric shrinkage rate. The T/R ratio is reasonable but because of the high shrinkage rate the timber can exhibit a fair amount of movement and should be properly fastened with an approved installation system.


Massaranduba In Application

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