What is Tali?
Tali is a tropical hardwood that naturally falls in durability class 1-2 (EN 350) and is therefore suitable for permanent ground contact (use class GK4, EN 335). At Houthandel Jan Sok in Meppel it is used for decking boards, load-bearing structures and other outdoor applications where long-term resistance to moisture and soil is required. Anyone asking "what is Tali?" is really looking for a low-maintenance option that lasts decades without impregnation or chemical treatment.
In this guide we explain the definition, properties, applications, pros and cons and maintenance of Tali hardwood — based on the facts that apply to tropical hardwood at Houthandel Jan Sok (KvK 04062841, founded 2009, 4.8 stars from 141+ reviews).
Definition
Tali is a tropical hardwood species that, like Okan, Azobe and Cumaru, is naturally very dense and hard and needs no protective treatment to function outdoors. Whereas softwoods such as Douglas and larch must be impregnated or placed on concrete pads to survive soil contact, Tali can be used directly in the ground or in permanent contact with water. Its natural density makes the wood resistant to rot, fungi and insects by itself — a property it shares with the other tropical hardwood species in the range.
Properties and durability class
On the EN 350 scale Tali hardwood scores in durability class 1-2. Class 1 means "very durable" with an expected service life of more than 25 years; class 2 is "durable". For use in permanent ground contact (use class GK4 according to EN 335) this is the correct range — species in class 3 or lower are not suitable for it.
Specific mechanical values (density in kg/m³, bending strength, Brinell hardness) are not published as a fixed number for Tali, because they vary slightly per batch and origin. What is established: Tali belongs to the dense tropical hardwood species that retain their function outdoors and in the ground without treatment, comparable in use class to Cumaru (class 1-2). Anyone who needs an exact spec for a specific structure can request from Houthandel Jan Sok what is in stock.
Applications
Tali is used in practice mainly in three situations:
Decking boards — terrace, garden path or pool deck where the wood is permanently exposed to weather and moisture.
Load-bearing structures — posts, beams and load-bearing profiles placed in or on the ground.
General outdoor use — fencing parts, cladding and boundary screens where long service life without maintenance is desired.
For those comparing Tali against other hardwood species for decking, read our comparison Okan versus Tali for decking boards or the broader decking material comparison.
Pros and cons
Pros
Naturally durable (class 1-2), no impregnation needed.
Suitable for permanent ground contact (GK4).
Low maintenance: no annual treatment required for the wood to function.
Long service life in outdoor structures.
Cons
Heavier and harder than softwood, so working it requires more force and good tools.
Less specific public data available than for species such as Okan or Azobe — anyone needing exact technical values must request them.
Greys naturally when left untreated outdoors; cosmetic, not structural.
Maintenance
Untreated Tali outdoor wood greys naturally under the influence of UV and moisture. That is a cosmetic process that does not affect structural strength. Anyone who wants to preserve the original colour can oil the wood periodically; anyone who accepts the grey surface does not need to do anything else. Annual cleaning with water and a soft brush is enough to remove algae and dirt. Treatment is not a necessity with Tali but a choice.
Frequently asked questions
What kind of wood is Tali?
Tali is a tropical hardwood that naturally falls in durability class 1-2 and is suitable for permanent ground contact, without impregnation or chemical treatment.
How long does Tali last outdoors?
For class 1-2 hardwood an expected service life of more than 25 years applies in outdoor structures; in permanent ground contact Tali is one of the species approved for it.
Is Tali suitable for decking boards?
Yes. Tali is among other things used as decking board for terrace, garden path and pool deck. Compare with Okan and Cumaru in our decking material comparison.
Does Tali need treatment?
No. Tali is naturally resistant to rot, fungi and insects. Oil is only needed if you want to keep the colour; the wood also functions without treatment.
View the full hardwood range from Houthandel Jan Sok — Tali in stock.