Poles and Wedges

Wedge Segment Fence
( click to see detailed picture )
Radially sawn drop segments are a totally unique product produced by a patented sawing method that results in perfectly quartersawn boards. Drop segments are supplied unseasoned and shrink with virtually no distortion and minimal checking on the exposed face.

Request A Quote Or Samples

Get A QuoteOrder Free Sample

Available Species

Poles and Wedges are available in the following species:

Other Products



Natural edge drop segments are sawn from naturally durable regrowth hardwoods such as Silvertop Ash or Yellow Stringybark (Class 2).

Sketch / Sections

Typical drop segment wall/fence cross section (left) and Typical drop segment profile (right)


Natural edge drop segments vary in cross section and profile depending on the diameter and profile of the log from which the segments have been cut. On average, segments will have cover of approximately 75mm to 125mm and are around 50mm thick at the outer or sapwood edge. Each 22.5 degree segment has a rebate in the bark edge to accept the apex of the radial face of another segment. This system allows the assembly of multiple segments into a wall or panel (see Figures 1 & 2).

Lengths and Availability

DROP WEDGES ARE SUBJECT TO AVAILABILITY OF SUITABLE LOG SIZE. All Drop Wedge or pole orders require a min. of 3 weeks lead time from the confirmation of order. Boards are generally supplied in lengths of 2.4 to 3.0 metres. Longer segments are available from Radial Timber Sales on request. Drop segments are generally ordered by the square metre and supplied in pack lots.

Show more.

Fixing & Applications

Tips on Fixing:

Drop segments are unique in that they can fit together without fixings. Segments or wedges cut from the same log have similar characteristics and therefore behave in a similar fashion. Each segment will have a slight but consistent curve, resulting from natural tensions in the log from which they have been cut.

Drop segments are typically assembled or fitted with a tongue and groove joint into round slotted poles, however, conventional square timber posts or sections can be designed and fabricated to provide end supports. When fitting segments into slotted poles, fixings should not be required but some ends may need to be thinned in order to fit them into the slots (slots about 45mm thick and 45mm deep are recommended). Panels may be supplied cut to length and end thicknessed so that fences and walls can be constructed with little or no carpentry skills (please contact Radial Timber Sales for further information).

For fence and panel construction, boards should be aligned by sight and levelled with the line or contour of the fence. The bottom board or boards should be blocked or fixed so that the ends are level or parallel to the line of the fence. Drop segments can then be slotted into the posts or poles, remembering to keep the tops of each segment and appearance of the panel on contour until panel height is reached. Panels with aligned baseboards can be levelled during construction by tamping down with a lump of wood or hammer. Tops of the panels can be adjusted to match finished height by selecting segments with the required cover to fill the top part of the panel.

Panels settle naturally during seasoning. Panels generally settle evenly but it may sometimes be necessary to tamp segments down in order to level the tops or to close gaps that may have appeared due to uneven settling. High fences may require “topping up” of segments once settling has taken place. Extra boards are generally supplied to cater for shrinkage (around 5% is normal).

When designing buildings with drop segments, consideration should be given to the settling caused by shrinkage. “Settling gaps” at the top of each wall panel can be covered with face boards. Alternatively, wall panels can be topped up or added as part of the ongoing building maintenance. Where topping up is not convenient, boards can be fixed in the slots by nailing or screwing but care should be taken to ensure segment rebates haveadequate cover (pre-drilling the ends of the boards may be necessary when fixing).

If sound attenuation is required, each end should be sealed with an appropriate acoustic insulator. Further sound attenuation fence details are available upon request.

Suggested Applications

Natural edge drop segments have been used as both internal wall systems and as external panels or fences in a variety of residential and commercial applications. Uses include safety fences, sound barriers, retaining walls, sheds, shelters, cabins and feature walls. For images of Board & Batten visit the poles & wedges 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.

Lyctine Borer (Powder Post Borer): All timbers used by Radial Timber for Natural Edge Weatherboards are from species that are deemed as ‘not susceptible’ to the lyctine Borer. This pest does not cause structural damage, but can live in the sapwood of some susceptible hardwoods and leave a small hole and dust trail when it emerges. Radial Timber carefully tracks and controls all timber used to help ensure that only non susceptible species are used for our weatherboards, however, we cannot guarantee this and accept no liability related to the presence of this pest. Radial Timber recommends the application of a treatment as part of the initial application regime as noted below as added protection.

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.

For internal applications, boards can be left to season naturally, coated in a regular varnish or treated with a clear oil finish. Uncoated timber that is not exposed to the elements may darken slightly with time but will basically retain its original timber colour. Cleaning timber with a product like Oxalic Acid may be advisable to help remove any sap and water stains or general discolouration.

Timber Finishes

Radial Timber Sealer

We recommend our product to be coated at least with oil based sealer such as Radial Timber Sealer or decking finish on external timber.

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

Radial Timber Calculator
_   X
Select Product:
Width of the deck
Length of the deck
Joist spacing on centre in millimetres (eg. 450)
Coverage of deck board in millimetres (eg. 75)
Gap between deck boards in millimetres (eg. 5)
Screws per intersection of joist & deck board (eg. 2)
Wastage Allowance
L of Aussie Clear
Please note that this tool is to be used as a guide only.
Radial Timber takes no responsibility for the incorrect usage of this tool and advise that customers ensure that the quantities calculated are correct.
Deck and Screw Calculator Help