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Radial Decking is profiled from sustainably sourced back sawn bevelled edge boards. Radial Decking is supplied seasoned (ie. dry) and is available in 55x19mm and 80x19mm.
Radial Decking boards are typically sawn from naturally durable regrowth hardwoods such as Silvertop Ash, or Yellow Stringybark (ie. Class 2 durability). Class 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 the 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 (pinhole) 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
(Radial Decking boards in cross-section)
Radial Decking boards are 19mm thick and typically supplied in a smooth dressed and seasoned (ie. dry) width of 55mm, 80mm or 100mm (100mm subject to availability). The beveled edges mean less debris will build up in the cracks creating a clean finish.
Radial decking is generally kept in stock. Boards are supplied in random lengths of between 1.0m and 6.0m. (av. lengths approx. 4.0m).
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 decking 55 – 4 to 5mm gaps between boards
-Radial decking 80 – 5 to 6mm gaps between boards
-Radial decking 100 – 6 to 7mm gaps between the board
Fixings: Radial Decking should be screwed with 50mm decking screws, care should be taken close to ends to avoid splitting (You may need to pre drill holes) 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 the edge of the 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. (NOTE: unprotected northwest facing decks may be subject to extreme temperature changes and therefore, timber is more likely to check or move). 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 undercover 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.
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: www.radialtimbers.com.au gallery
All exposed, externally fixed decking 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 being 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.
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