Landscape Specification

CONTENTS

intersections of planes shall be rounded gradual and curves generous. To grading from edgings provide
horizontal shoulders, minimum width 500 mm, before any change of level.


3.4.        SUBGRADE
The subgrade is to be compacted to 95% minimum dry density ratio (+ 0mm- 25mm of design levels) prior to
sub-base placement. Any areas of soft ground are to be excavated & replaced with suitable fill and
compacted to prevent subsidence. Provided that all areas are free draining and no ponding of water occurs.
Subsoil drains to have minimum fall of 1:100.

The sub-grade surface shall be left free from rubbish, stones, felled timber and brush, and left smooth and
clean, true to the grade and levels shown on the drawings.


3.5.        TIMBER WORKS
Sawn / Dressed Timber
All timber shall be hardwood to AS 2082 to the stress grade nominated. All timber is to be ‘appearance’ or
dressed grade. All hardwood timber specified is to be Durability 2 class except where in contract with ground
surface where it shall be Durability Class 1. All sawn timber to be branded as complying with the
requirements of AHQC (Australian Hardwood Quality Council).

Timber Connections
Structural fasteners shall be located in sound timber avoiding timber defects. Fasteners shall be installed in
accordance with Manufacturer’s instructions. All bolts, nuts, washers, nail plates and brackets to be hot
dipped galvanised to AS 1650.

Additionally, bolt shanks and washers bearing against timber shall be protected with Dulux Amercoat 385
applied in accordance with the manufacturers specification and properly cured before installation. Bolt holes
to be 10% greater than the nominal bolt sizes. Position bolts to facilitate tightening. Coat all bolt shanks with
CN Emulsion before installation. Bolts to be snug tight (do not over tighten). Washers to be placed under all
bolt heads (except where cuphead bolts specified) and nuts.

Timber Quality
Timber shall be graded and audited under the Australian Hardwood Quality Control Program.

At the time of grading, the bottom and sides of the plank shall conform to Structural Grade No. 2 (for Forest
Red Gum Structural Grade 1) (AS 2082)

Preservative Treatment
Treatment, natural durability classes and combinations thereof shall conform to AS 1604, TUMA (Timber
Utilisation and Marketing Act Qld 1987) and TMA (Timber Marketing Act NSW 1977).

A certification of treatment shall be provided.

Timber pavement finish
Where timber is used as a floor finish ensure timber decking coating comply with the slip resistance
requirements of the National Construction Code (NCC) and Australian Standards AS/NZS 4586 2013, AS
HB 198 2014. Provide complying slip resistance test results to the Project Manager.


3.6.        ARTIFICIAL TIMBER WORKS
Artificial timber quality
Artificial timber shall be

•    mould and mildew resistance
•    heat hesitance up to 80 degree Celsius to eliminate delamination
•    resistance to chemical used for cleaning and removal of graffiti


URBIS
URB-SPC-LAN-P0025138                                                                                       PAGE   14