rktimber

Modern horizontal shiplap boards have become increasingly popular as they offer a contemporary alternative to traditional vertical cladding.

This horizontal orientation not only provides a sleek and modern look but also complements vertical timber, allowing the two styles to coexist harmoniously on the same facade.

RK HORIZONTAL Brochure

Codemark certificate - Horizontal

RK Profile Chart

RK Custom Flashings

Brochure

RK Rusticated horizontal shiplap weatherboard profiles are compliant for use as per Clause 9.4.1.1 E2/AS1. Profiles are as given in NZS 3617 or Branz Bulletin 411.

Modern machining methods have enabled manufacturers to modify rusticated profiles to create a variety of lap detailing and offer a vast range of options to suit the needs of designers and end users whatever the context.

Standard Profiles

Architectural Profiles

Concealed Fix Profiles

Codemark Profiles

Cedar Profiles - RK Horizontal

Flexible Underlay Details

Rigid Underlay Details

Concealed Fix Details

Cedar Details - RK Horizontal 20mm Cavity

Cedar Details - RK Horizontal Direct Fix

Cedar

Truwood Profiles - RK Horizontal

Truwood Details - RK Horizontal 20mm Cavity

Truwood Details - RK Horizontal Direct Fix

Truwood

Larch Profiles

Larch Details - RK Horizontal 20mm Cavity

Larch Details - RK Horizontal Direct Fix

Larch

Abodo Profiles

Abodo Details - RK Horizontal 20mm Cavity

Abodo Details - RK Horizontal Direct Fix

Abodo

RK Board and Batten Weatherboards are a classic and distinctive cladding option, often used in traditional and modern architecture. The layered board and batten pattern can be customised with deeper set battens and wider boards to complement a wide range of styles.

Known for its ease of installation and durability, it’s available in two main types: direct fixing and 20mm cavity, to suit various projects.

Board and Batten Weatherboards are a distinctive timber cladding option. Choose direct fixing or 20mm cavity. The board and batten pattern can be customised to a range of styles.

RK Board & Batten

RK Vertical Weatherboards are designed to create clean, vertical lines that contribute to a minimalist aesthetic, making it ideal for modern architectural designs. This cladding is available in two well-established cavity types: 20mm and 45mm, offering versatility in installation and design.

RK Timbers Vertical Timber cladding is further enhanced by a comprehensive range of accessories, providing added versatility and ease of installation. These accessories ensure a seamless integration with design elements.

RK Vertical Weatherboards contribute to a minimalist aesthetic. This timber exterior cladding system is available 20mm and 45mm cavity types.

RK Vertical 

RK Bevel Back Weatherboards are known for their durability and classic appearance. The bevel back profile refers to the angled cut at the back of each board, which ensures efficient water runoff when boards overlap.

This outstanding weatherboard provides both functional and aesthetic benefits, enhancing the performance and look of the exterior cladding. It’s available in two main installation types to provide flexibility for different project requirements: direct fixing and 20mm cavity.

Bevel Back Weatherboards are outstanding weatherboards for exterior cladding, known for durability and a classic rustic appearance.

RK Bevel Back

The RK INTERSET® Recessed Window System is designed to offer a sleek, recessed finish around windows and doors while providing effective weatherproofing and thermal efficiency benefits.

INTERSET® flashings are used exclusively in conjunction with the RK Timbers Vertical and Horizontal 45mm structural cavity batten system. This system enables standard aluminium windows to be recessed to the framing line from the outer façade, providing a natural 65mm deep window recess.

INTERSET® flashings used with the RK Timbers Vertical and Horizontal 45mm structural cavity batten system, allow standard aluminium windows to be recessed into the timber cladding.

 Interset

RK Timbers premium blue label Western Red Cedar shingles are ideal for exterior cladding, offering a high-quality, vertical grain that provides exceptional durability and a refined, natural look. These shingles are crafted to withstand the elements, giving a timeless appeal to any building’s exterior. Perfect for those looking for both beauty and resilience in their cladding choice.

Would you like more details on sizing, installation, or how this premium cladding can enhance your project?

Western Red Cedar shingles are ideal for exterior cladding, offering a high-quality, vertical grain that provides exceptional durability and a refined, natural look.

RK Shingles

The versatility of timber enables RK Timbers to offer a huge array of wall or soffit panelling & ceiling sarking alternatives.

There is an array of many species to choose from. This coupled with a large range of profile options and finishes, means there is a solution to suit almost any interior design.

Our most popular option is Western Red Cedar, which can be offered in a range of finishing colour choices. Timber profiles are available in many widths and thicknesses, can have a ‘V’ joint or square negative detail of varying widths and be finished with either a bandsawn or dressed and sanded face.

RK Timbers have an innovative hidden screw-fix system to suit all panelling profiles. This allows the timber profiles to be invisibly fixed, flush to either timber ceiling battens or aluminium ceiling systems.

RK Panelling

The wood is pale yellow-white with distinct annual rings, straight grain, tight knots, and a fine texture. It's dense for a softwood due to slow growth, moderately durable, with heartwood resistant and sapwood moderately resistant to preservative treatment. 

Larch dries fairly quickly, with slight degrade, but kiln drying is effective.

European Larch

Iroko is golden orange to brown, lighter vessel lines are conspicuous on flat sawn surfaces. The colour of Iroko darkens with age. The grain is interlocked and sometimes irregular and the texture rather coarse but even. 

Iroko

Sapele heartwood is medium to dark reddish-brown, characterised by a well-defined ribbon striped figure on quartered surfaces. The grain is interlocked or wavy and the texture is fairly fine. Sapele has a cedar-like scent when freshly cut and is moderately durable.

Sapele

Australian Oak is a mixture of two Eucalypt species. It ranges in colour from pale pink to brown straw. It is straight, open and even grained with a uniform texture, usually all quartersawn for stability with excellent staining properties. 

Australian Oak

American Black Walnut heartwood is a rich dark chocolate brown to purplish-black, mostly straight grained but with wavy or curly grain occasionally present. The texture is mildly coarse. Walnut is usually supplied steamed, to darken the pale coloured sapwood.

Walnut

Modern horizontal shiplap weatherboards are very popular as a contemporary alternative to vertical timber cladding.

RK Horizontal

Select below for our range of Standard, Architectural or Concealed Fix profiles. Click on the profile name to preview.

Check boxes for files you wish to download in PDF, DWG or RVT formats.

Random Width & Depth Profiles

87x28mm Profile Range

89x18.5mm Profile Range

90x18.5mm Profile Range

137x18.5mm Profile Range

139x18.5mm Profile Range

140x18.5mm Profile Range

140x28mm Profile Range

156x28mm Profile Range

180x18.5mm Profile Range

180x28mm Profile Range

183x28mm Profile Range

185x28mm Profile Range

187x28mm Profile Range

189x18.5mm Profile Range

190x18.5mm Profile Range

190x28mm Profile Range

230x28mm Profile Range

231x28mm Profile Range

232x28mm Profile Range

246x28mm Profile Range

280x28mm Profile Range

Please select the file type you prefer - 20mm cavity on a flexible underlay (FU) or a rigid underlay (RU) or concealed fix cladding on a rigid underlay:

Typical Details

Window Details

Internal Corner Details

External Corner Details

Horizontal Details

Vertical Details

Optional Details

RK Timbers extruded aluminum flashing range is a game-changer for timber cladding projects! The innovative profiles allow for seamless transitions at junctions and between vertical and horizontal timber cladding, offering both functionality and aesthetic appeal. Multiple uses also mean more creative opportunity for designers and builders, which is a big win in timber cladding performance and design.

RK Flashings

Sansin is the global leader in environmentally-friendly wood protection. Since 1986, they’ve been focused on creating the best performing, most beautiful water-borne timber finishes in the world. Their innovative research and development program has made them the leader in developing environmentally-friendly alternatives to traditional wood coatings.

Available from RK Timbers in two product types.

is a durable wood treatment that allows exterior timber to weather naturally while offering exceptional water repellency and protection from blackening and deterioration. Easily applied, natural colours that let the exposed surface weather gently and more evenly.

is considered the finest exterior, translucent timber protection for factory finishing, delivering both beauty and durability to the highest standard in an endless spectrum of fuller colours. This unique waterborne, alkyd formula uses water not solvent to penetrate wood.

• Protects wood while allowing weathering 

• Creates complete range of weathered looks

• Environmentally friendly, low toxicity

Sansin PrecisionCoat Woodforce & SDF

RK Timbers provides a comprehensive selection of cavity battens designed for both vertical and horizontal cladding applications. Our cavity battens enhance ventilation and moisture management behind the cladding, promoting long-lasting durability for the building envelope. With options suited for various installation needs, our battens are crafted for ease of use and effective performance in any project.

All battens are treated with the durable and environmentally preferable H3.2 MCA treatment. Let us know if you’d like to discuss the specifics of sizes, materials, treatment, or applications to match your projects requirements.

Cavity Battens

Dryden WoodOil is a water-repellent, non-filming timber protector made in New Zealand. It deeply penetrates wood, reduces warping and splitting, and extends timber life with UV-stable fungicide. Available in various colours to enhance timber character or in clear for a natural, weathered look while maintaining water resistance. Designed for New Zealand conditions, it preserves timber’s beauty without obscuring the grain.

Dryden Woodoil

KOMO® Finger-jointed, Laminated Timber Planks

Premium KOMO® timber blanks made from the best and most popular joinery timbers of the world, are machined four sides, to accurate dimensions and precise straightness, for a consistent quality working material. All 5.9m in length, they are finger-jointed and laminated for extra strength and stability. The vertical grain allows for a fine paint finish.

The Dutch KOMO® mark, trusted for more than 55 years, guarantees consistent quality that exceeds all the requirements of our local professional trades and government standards. KOMO® products are repeatedly tested by independent experts. Laboratory tests show they last a long time and require less

Finger-Jointed and Laminated Timber Blanks

RK Timbers provides a specialised range of high-quality fixings for cladding, cavity batten and decking installation, including stainless steel, silicon bronze and vintage bronze heat-treated options. These fixings are chosen for their exceptional durability and compatibility with other materials, ensuring longevity and stability in our diverse climate. Each type is crafted to meet the specific needs of the timber and application, providing a secure and aesthetically pleasing finish for your project. Would you like more information on the benefits of each material type or guidance on selecting the best option for your project?

Fixings

Abodo Vulcan is thermally modified New Zealand grown and manufactured radiata pine, engineered with patented vertical grain construction for superior weathering. Sustainably sourced from rapidly renewable pine plantations, it offers enhanced stability, reduced resin, and natural durability without chemicals. Available in architectural profiles and RK Timbers’ full range of cladding systems.

The registered trade mark Abodo is owned by Abodo Wood Limited.

Abodo Vulcan is thermally modified sustainable radiata pine timber, engineered in New Zealand with patented vertical grain construction & chemical free durability.

Abodo®

Accoya is a high performance modified timber made from sustainably sourced Radiata Pine using an acetylation process that improves durability, stability, and resistance to moisture, insects, and decay, making it ideal for exterior applications.

Variations include Accoya Color Grey, which is coloured through the wood for a consistent grey tone that weathers evenly, and Charred Accoya, which features a dark finish created using the traditional Yakisugi charring technique. In New Zealand, Charred Accoya is produced by approved manufacturers such as Chartek for architectural cladding applications.

Accoya

The heartwood of American cherry varies from rich red to reddish-brown, which will darken with age and exposure to light. It has a fine, straight, close grain with a smooth texture and distinctive narrow brown pith flecks and small gum pockets. Sapwood is creamy white.

American Black Cherry

American Hard Maple colouring is cream white with a pinkish tinge. Usually straight grain but sometimes curly or wavy and the texture is fine and even. Fine brown lines give an attractive growth ring figure. Large trees may have dark brown heart. The timber has high resistance to abrasion and wear and finishes very well.

American Hard Maple

American White Ash heartwood is a grey-brown, sometimes tinged with red. Demand is usually for the lighter coloured white sapwood. Generally straight grained with a coarse but even texture. Ash is a non-durable timber prized for its use in sports equipment and tool handles.

American White Ash

American white oak has a pale yellow-brown color with a pinkish tint, straight grain, and a silver grain figure on quarter-sawn wood due to its broad rays. Northern Oak grows slowly, yielding lightweight wood deemed better than the faster-growing, harder Southern oak.

White Oak for Flooring, Interior Joinery & Furniture, Cabinetmaking, Wine Barrel Staves & Caskets. US forests prioritize sustainable management and environmental conservation.

American White Oak

European Beech heartwood and sapwood are cream to pale pink in colour with a straight grain and fine, even texture. It is common practice to steam the timber, which turns it to a darker pink-red colour.

European Beech

European Oak heartwood is light tan to biscuit colour and usually straight grained but irregular or cross-grained material can occur. Characteristic silver grain figure on quartered surfaces due to broad rays.

European Oak

Garapa wood boasts a light yellow to honey-brown color with interlocked grain and fine texture. Exceptionally durable, it resists rot, decay, and fire, remaining lustrous without bleeding. 

With high silica content, it's scratch-resistant, making it ideal for kiln-dried decking. 

Garapa

Western Hemlock heartwood is a uniform pale brown with distinctive growth ring figuring. The wood is straight grained, non-resinous with a lustrous surface and a fine, even texture.

Hemlock

Kebony pioneers Dually Modified™ Wood Technology, offering a durable hardwood alternative trusted by architects for 20+ years. With a rich brown color that ages to a natural silver-gray patina, Kebony enhances wood strength and longevity through active and passive modifications, surpassing tropical hardwood performance sustainably.

Kebony

Kwila heartwood ranges from yellow-brown to dark red-brown, with slightly interlocked grain and a moderately coarse texture. Yellow vessel deposits are common, and it's nonsiliceous, occasionally lustrous. When wet, it bleeds, leaving a dark red-brown stain. 

Kwila

The heartwood is a deep purple-violet when freshly cut, maturing to a dark brown. Straight grained but often irregular, wavy and sometimes interlocked. Texture moderate to fine.

RK0001_SFS_Sapele_v2.pdf

Purpleheart

This softwood has large, wide, pale-coloured sapwood, which is distinct from the pinkish-brown heartwood. There is moderate growth-ring figure resulting in a relatively uniform and fine texture. The timber has moderate to high lustre and readily accepts preservative treatment.

Radiata

Taun heartwood colour is pink-brown maturing to a dull reddish-brown with age. The grain is usually straight but sometimes interlocked or with a regular wave.

Taun

Thermally Modified Pine is treated using heat and steam to enhance durability, stability, and resistance to decay. The process also gives the timber a rich brown tone and eco-friendly credentials.

Thermally Modified Pine 

Tonka heartwood when cut is reddish-brown or purplish-brown with lighter streaks and on exposure gradually becomes uniform light brown. Lustre is low to medium, texture is fine and grain interlocked with a waxy or oily feel. Similar to spotted gum in appearance. 

Tonka

Truwood® is a Codemark-certified, renewable timber designed for RK Timber systems, offering durability, stability, and natural beauty. Utilizing thermal modification technology, it features a Teak-colored finish without chemicals. With a Durability Class 2 rating and low moisture absorption, it's ideal for cladding, windows, doors, and more, enhanced by RK Timber’s quality coatings.

Vitex is a durable hardwood with a pale yellowish to creamy-grey appearance. Texture is fine and slightly lustrous with an even grain. When freshly cut the timber has a leathery odour and the timber is greasy to the touch. Vitex is sourced from low-impact, village-based operations in the Solomon Islands.

Vitex is a durable hardwood with a fine texture and slightly lustrous with an even grain. Vitex is sourced from low-impact, village-based operations in the Solomon Islands.

Vitex

Fresh Western red cedar heartwood ranges from dark brown to pink, aging to reddish-brown and eventually silver-grey when weathered. Sapwood is paler. Straight grained with a coarse texture, it has minimal shrinkage and machines and stains easily. 

Western red cedar heartwood has minimal shrinkage and machines and stains easily. British Columbia's cedar forests are well-managed and certified under SFI, CSA, FSC®, or PEFC.

Western Red Cedar

Alaskan yellow cedar heartwood is a consistent pale yellow colour with a fine, even texture and is straight-grained.

It is not a true cedar and is harder and more durable than most other softwoods. 

Cedar Profiles - RK Horizontal

RK HORIZONTAL SHIPLAP WEATHERBOARD SYSTEM PROFILES

RK Horizontal Shiplap Project - RVT file

Horizontal Shiplap Profiles - ALL PDF FILES

Index

RK67

135x18.5mm (25mm neg)

RK68

190x18.5mm (25mm neg)

Cedar Details - RK Horizontal 20mm Cavity

Cedar Details - RK Horizontal Direct Fix

Available Timbers

Timber Systems