Radial Decking

New Deck

Radial Decking is profiled from back sawn bevelled edge boards and incorporates a number of exciting new features which includes a domed upper face for shedding water. Radial Decking is supplied seasoned (ie. dry) and is available in a range of widths.

Available Species

New Deck is available in the following species:

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Decking boards are typically sawn from naturally durable regrowth hardwoods such as Silvertop Ash, Southern Mahogany or Yellow Stringybark (ie. Class 2 durability). Other species (including Class 1 durability) may also be available on request. Both Class 1 & 2 timbers are deemed suitable for use as decking in Australian Standard AS 080-1693.

Silvertop Ash has a greater tendency for expansion and contraction when exposed to the weather and elements. Because of this, it is very important to

allow recommended spacing between boards to avoid issues when timber swells due to increased moisture content. Some surface checking may occur if timber is exposed to the weather and these non structural cracks that are typical in most Australian hardwoods are more prominent in Silvertop Ash.


All timber is supplied as standard and better and is not select. Small tight knots, gum veins, splits, ambrosia (pin hole) and other marks are acceptable features that sometimes occur in boards.

Timber is graded in accordance with AS27462 – 1994 Australian Standard Part 2 Grade description.

Sketch / Sections

NEW DECK boards in cross section

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The boards are 19mm thick and typically supplied in a smooth dressed and seasoned (ie. dry) width of 55mm, 80mm or 100mm. The main features of all boards are:

  • a domed upper face designed to shed water
  • sloping sides to prevent debris build
  • concave lower faces to reduce contact with the joist and thus reduce the likelihood of moisture being trapped

Lengths and Availability

Radial Decking is generally kept in stock. Boards are supplied in random lengths of between 1.5 and 5.4m but some shorter lengths may also be included (av. lengths approx. 4.0m but wider profiles will contain more shorts). Short packs containing lengths between 1.8m and 2.4m are available on request. Set length boards may be available in limited quantities as a special request (a surcharge is applicable to all set length orders).

Engineered Set Lengths (ESL)

Engineered Set Lengths are finger joined boards produced to specified lengths, and are held in stock lengths of 5.4m when shorts are available from the mill. Special length ESL orders will only be available as supply allows, and availability should be checked at least 12 weeks prior to order.

Fixing & Applications

Fixing Recommendations:

Setting up: Radial Decking is laid wide face up. Gaps should be left between boards to allow for swelling during wet weather. The amount of swelling (or shrinkage) will vary depending on the width of the board, the species of timber and local climatic conditions. Joists should be spaced at max. 450mm centres.

Installation: For most “typical” installations, the following spacing guide should be followed but also consult Radial Timber Sales for site specific recommendations (eg. in areas subject to high moisture such as south facing decks or in bush settings, it may be advisable to increase the spacing between boards to allow for additional swelling):

  • RADIAL DECK 55: 4 to 5mm gaps between boards
  • RADIAL DECK 80: 5 to 6mm gaps between boards
  • RADIAL DECK 100: 6 to 7mm gaps between boards

Fixings: Decking can be gun or hand nailed with 50mm long hot dipped galvanised or stainless steel “twisted shank” or “ring shank” nails or decking screws, but care should be taken close to ends to avoid splitting (pre-drill all holes if hand nailing). Radial Decking 55 can be can be fixed with one screw per board per joist, however, two screws at butt joints or ends is advisable (position screws in the centre of boards). Radial Decking 80 & 100 should be fixed with 2 screws per board per joist (position screws approx. 20mm in from edge of board).

Seasoning & Storage: Some surface checking may occur if timber is exposed to the weather but these non structural cracks are typical in most Australian hardwoods. It is also normal for hardwoods to leach red/brown extractives during heavy rain periods. Extractives tend to be less prominent in lighter species but it is advisable to cover or protect walls and paving until all extractives have leached (can vary depending on rainfall but will generally continue for up to 6 months). Packs should be stored up off the ground and under cover or protected with an additional tarp to prevent swelling. If wetting does occur, allow a min. of 24 hours for timber to dry before fixing.

Suggested Applications

Radial Decking is a stylish alternative to traditional decking and has been used in: houses, apartments, visitor centres, restaurants, parks, screens and fences. For images of Radial Decking visit the deck product galleries.


All exposed, externally fixed cladding will tend to fade to a silver grey colour if left uncoated. The degree of greying will vary depending on the amount of exposure to sun, wind and rain. The timber used in this above ground product has natural durability and when used in conjunction with good building practices, should generally not require additional treatment against decay.

Native timbers should be offered some weather protection while acclimatising to local conditions. Radial Timber recommends the application of an oil based sealer or decking finish on external timber (especially if unseasoned or fixed during extreme weather conditions). There are a variety of treatments, stains and coatings available and most can be applied prior to or shortly after fixing. For more detailed information, please call us on 03 9768 2100.

Newdeck 55mm
Radial Decking 55mm
Newdeck 80mm
Radial Decking 80mm
Newdeck 110mm
 Radial Decking 110mm
Complete Details New Deck

New Deck Sample in 3 different SpeciesNew Deck Sample in 3 different SpeciesNew Deck Sample in 3 different SpeciesSilvertop Ash New Deck SampleSilvertop Ash New Deck SampleSilvertop Ash New Deck SampleNew Deck 55 SampleNew Deck 55 SampleNew Deck 55 SampleNew Deck 80 SampleNew Deck 80 SampleNew Deck 80 SampleNew Deck 100 SampleNew Deck 100 SampleNew Deck 100 Sample

Timber Finishes

Radial Timber Sealer

We recommend our product to be coated with at least an oil based sealer such as Radial Timber Sealer or decking finish on external timber.  Radial Timber Sealer is required to repel and control moisture, hence minimises splitting, cracking and checking that can occur. It still allows the timber to grey off naturally while leaving it look and feel like timber. It can be applied to hardwoods used for external cladding, window frames, fences, trellis, decking and pergolas.

Radial Timber now has the option to have your timber pre treated with our Radial Timber Sealer, please enquirer about having your timber oiled when you get in contact with us.

Visit the Radial Timber Sealer page on Preschem website for more information about the product.

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