Jarrah Decking

Overview

The common name “jarrah” is also the aboriginal word for both the tree and timber. Jarrah timber reflects the tones of the southwest WA landscape from where it comes from, with very deep red colours seen in the heartwood. Jarrah has an attractive grain with some incidence of wavy or interlocking grain occurring, and a moderately coarse texture. Jarrah timber is quite similar to red ironbark in which it is a very dense and hard timber, both sharing the deep red colours. Jarrah is also naturally weather, rot, termite and marine borer resistant making it a highly durable timber for outdoor purposes, however the sapwood of the timber is Lyctid borer susceptible, so the sapwood present in decking may sometimes be treated. Jarrah availability is somewhat limited due to the slow growth of the trees and the fact the timber can only be sourced from old growth forest and native forest regrowth in WA. It’s for this reason jarrah decking is usually sourced from recycled means when obtainable.

Jarrah Decking
Jarrah Decking

 

Jarrah Decking (Wet)
Jarrah Decking (Wet)

 

Pros & Cons

PROS CONS
Highly durable and dense Limited availability
Rot, termite and weather resistant Sourced from old growth forests
Retains natural colour for longer due to close grain Expensive
Little tannin leach Requires pre-drilling
Mostly supplied in random lengths
Lyctid borer susceptible

 

Properties

Name Eucalyptus Marginata
Colour (Heartwood) Deep brown and reds
Colour (Sapwood) Pale yellow to pink orange
Durability Class 2
Density 820 kg/m3
Hardness Janka rating 8.5
Checking rating
Shrinkage rating
Availability Limited Availability
BAL Rating 12.5
19
Termite Resistant YES
Lyctid Borer Susceptible YES
Tannin Leach Little
Origin WA