BRUSH BOX

BRUSH BOX
BRUSH BOX2018-05-08T23:27:00+00:00

Project Description

WOOF Timber - Brush Box

Brush Box

Other Names

Pink Box, Scrub Box, Tristania conferta

Brush box is a medium to large sized Australian hardwood that grows along the edges of the rainforest areas of New South Wales and Queensland. It is used for a variety of applications including flooring, cladding and bridge decking.

Brush box is a medium to large sized Australian hardwood that occurs along the edges of the rainforest areas of the central coast of New South Wales to Bowen in Queensland.

Its heartwood can vary in appearance, from a greyish pink through to a reddish brown, while the sapwood is usually paler in colour. Brush box has a fine and even texture with an interlocking grain – a feature that is appealing for appearance-based applications such as timber flooring, but can cause significant distortion during drying.

Brush box has a poor workability in part due to its density, interlocked grain and the presence of silica. It does however provide good resistance to wear and splintering. The natural waxiness may cause problems with some adhesives but provides a very good base for paints and stains. Brush box is not suitable for steam bending.

Brush box is used for a variety of applications including flooring, cladding, paneling and some structural applications. It is generally available for use in New South Wales and Queensland.

Shrinkage

Very Low Low Medium High Very High
Tangential 9.70%
Radial 4.40%
Unit Movement Tangential 0.38%
Unit Movement Radial  0.24%

Strength Group

Very High High Reasonably High Medium High Medium Reasonably Low Low Very Low
Unseasoned S1 S2 S3 S4 S5 S6 S7
Seasoned SD1 SD2 SD3 SD4 SD5 SD6 SD7 SD8

Stress Grade

Structural No. 1 Structural No. 2 Structural No. 3 Structural No. 4 Structural No. 5
Unseasoned F17 F14 F11 F8 F7
Seasoned F27 F22 F17 F14 F11

Density per Standard

Seasoned 890kg/m3
Unseasoned 1190kg/m3

Joint Group

Very High High Reasonably High Medium Low Very Low
Unseasoned J1 J2 J3 J4 J5 J6
Seasoned JD1 JD2 JD3 JD4 JD5 JD6

Colour

White, yellow, pale straw to light brown Pink to pink brown Light to dark red Brown, chocolate, mottled or streaky

Mechanical Properties

Modulus of Rupture – Unseasoned 77
Modulus of Rupture – Seasoned 121
Modulus of Elasticity – Unseasoned 12
Modulus of Elasticity – Seasoned 15
Maximum Crushing Strength – Unseasoned 39
Maximum Crushing Strength – Seasoned 64
Impact – Unseasoned 14
Impact – Seasoned 12
Toughness – Unseasoned Medium – 15 – 24 Nm
Toughness – Seasoned Medium – 15 – 24 Nm
Hardness – Unseasoned 7.8
Hardness – Seasoned 9.1

Durability

Low Moderate Reasonably High High
(0 – 5 yrs) (5 – 15 yrs) (15 – 25 yrs) (more than 25 yrs)
In-Ground
(0 – 7 yrs) (7 – 15 yrs) (15 – 40 yrs) (more than 40 yrs)
Above Ground
(0 – 20 yrs, usually < 5) (21 – 40 yrs) (41 – 64 yrs) (more than 60 yrs)
Marine Borer Resistance
Lyctid Borer Susceptibilitiy Not Susceptible
Lyctid Borer Susceptibility – Other
Termite Resistance Resistant

Fire Properties

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
EFH Ignitibility .
0 1 2 3 4 5 6 7 8 9 10
EFH Spread-of-Flame Index .
EFH Spread-of-Flame Index .
Critical Radiance Flux – Lower > 2.2 and < 4.5
Critical Radiance Flux – Higher ≥ 4.5
Smoke Development Rate < 750
1 – non-combustible 2 – reasonably non-combustible 3 – slightly combustible 4 – combustible
Fire Properties Group Number .
Average Specific Extinction Area < 250
Bushfire Resistance BAL 12.5 and 19 – All AS3959 required applications
Botanical Name Lophostemon confertus
Preferred Common Name Brush Box
Species Type Hardwood

Appearance

Brush box has a fine, interlocked grain and even texture with the heartwood ranging from greyish pink through to a reddish brown, while the sapwood is usually paler in colour. It is free of gum veins. The grain is especially appealing for appearance-based applications such as flooring.

Common Applications

Brush box is used for a variety of applications, which consist mainly of flooring, cladding, paneling and some structural applications. Brush box has also been used for mallets, mauls, handles, shuttles, turnery, wharf and bridge decking, carriage building, weatherboarding, boat building and wedges.

Common Form

Sawn

Workability

Brush box has poor workability in part due to its density, interlocked grain and the presence of silica. Nailing and screwing brush box may cause splitting.

The silica content can cause major problems for tool edges, while the natural waxiness, known as arjunolic acid, may cause problems with some adhesives but provides a very good base for paints and stains.

Brush box is not suitable for steam bending. It does however provide good resistance to wear and splintering.

Origin of Timber

NSW

Readily Available

NSW

Availability – Further Information

Brush box is limited in availability in its states of origin and rarely available in the other states and territories.

Native Forest.

Stairs, Interior

Interior staircase work is considered a specialised area of carpentry and joinery as its construction requires high levels of workmanship, detail and accuracy. Many interior stairs are built from quality joinery timber, cut and seasoned especially for staircases. Interior stairs differ considerably in design, from simple straight flights, commonly used in domestic work, to more elaborate stairs, constructed purposely as stand out features in public and commercial buildings.

The construction procedure described here applies to most general type stairs of either conventional or contemporary construction.

Flooring

Whether for structural or finished flooring applications, timber offers durability, versatility and adaptability. The warmth, strength and natural beauty of timber flooring has proved enduringly popular in a wide variety of interior settings.

Timber flooring is a timeless product, offering a warmth and natural beauty largely unmatched by other flooring options. This article provides an overview of the installation of solid timber strip flooring over bearers and joists, timber based sheet flooring products and concrete slabs. Timber flooring is typically supplied as either solid timber or laminated wood products, made from layers of bonded timber. It fits together with a tongue and groove joint and once in place, is sanded and finished. There is a wide variety of species to select flooring from and the right species for a given application will be dependent on numerous factors. Information relating to species selection, environmental assessment, finish selection and recommended maintenance routines are all provided in this section.