What You Need To Know : Resak Timber

wooden air shelving

Resak is a common timber hardwood that we export to many of our customers. It is a hardwood species that are utilized by plenty of building and furniture-making businesses. Continue reading to learn more about Resak Timber.

Resak Timber Overview

The sapwood of Resak is paler than the heartwood. In contrast to its Vatica subspecies, it is clearly defined in Cotylelobium. When still young, the heartwood is a light yellow colour that darkens to a rich red-brown colour in Cotylelobium.

Tests on the subspecies V. cuspidata, which has an average air-dry density of 1,040 kg/m3, showed that the wood had an average service life of 14 years under natural conditions.  As a result, the timber is regarded as being very durable under Malaysian circumstances. Other examinations to check the quality of resak timber revealed that some types of resak (likely the heavier variants) are found to be highly durable, ranking with the best types of balau and giam. Furthermore, it would seem as though the weaker versions are at least reasonably durable (likely the lighter variants).

The wood is a Heavy Hardwood variety, with an air-dry density ranging from 655 to 1,155 kg/m3.

Preservation Measures

For most Malaysian heavy hardwoods, including resak timber, preservative treatment is not entirely necessary. The timber was also said to be extremely challenging to treat. In general, it is expected that the heartwood of the hard and heavy varieties of resak will be just as challenging to handle as other Malaysian Heavy Hardwoods. Balau and chengal are a few examples. Resak is unlikely to accept preservatives in any significant quantity, with the possible exception of the wood of the lighter species.


In particular, in the tangential direction, shrinkage is high. Average tangential shrinkage is 3.4%, whereas radial shrinkage is 1.5%.

Air Drying

The timber fades very little and seasons fairly slowly. During drying, only very minor cupping, end-checking, cracking, and surface-checking are observed. Boards that are 13 mm thick air dry in about 3 months whereas those that are 38 mm thick require 5 months.


Resak, which is as heavy and hard as chengal (Neobalanocarpus heimii), requires exceptionally slow drying since it is sensitive to surface-checking. The timber should be air-dried to a moisture content of less than 30% before being kiln-dried in order to reduce drying costs and flaws.

Uses of Resak Hardwood

The wood is suitable for a variety of uses, including the following:

  • Bridges, piling, marine construction, beams and posts are all examples of heavy construction.
  •  Wooden crates (permanent heavy-duty)
  • Constructing window and door frames and sills
  •  Constructing tool handles (impact)
  •  Flooring (high traffic) (heavy traffic)
  •  Poles for power transmission
  •  Benches for laboratories
  •  Automobile bodies (framework and floorboards)
  •  Railroad connectors
  •  supports for fenders
  • Staircase (angle blocks, rough brackets, carriage, riser, stringer, tread, round end and winder)
  • Cooling tower (structural members)
  • durable furniture
  • Wooden utensils

and a lot more


Although Resak is one of the less popular options, numerous construction businesses do utilise it. Just because it’s less popular doesn’t mean that industries are completely ignoring it.

To get high-quality Resak Timber In Malaysia and to know more about our other services contact Montco-Well known timber supplier in Malaysia.

Leave a Reply

Your email address will not be published. Required fields are marked *