Wood Cladding Systems

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reSAWN offers several sustainable, durable options for real wood exterior cladding. All of our exterior cladding products are finished in the USA, in our facility in Telford, PA. We use domestic wood species whenever possible, including Cypress from the Southern US, Wester Red Cedar from the Pacific Northwest, and Atlantic White Cedar from the the coastal plain regions of the Eastern US. Our diverse offering includes modified pine from Abodo, Accoya & Kebony which have been developed specifically for exterior applications. reSAWN’s products have been meticulously designed using modern finishes and incorporating reSAWN’s many years of experience in the architectural & design specification market.

Click here to receive a price quote or place an order:. Vulcan thermally modified wood cladding is created from New Zealand plantation timber and engineered with a patented vertical grain orientation for superior weathering characteristics. reSAWN TIMBER co’s Abodo® Fine Sawn Face Vulcan Cladding provides a unique, textured surface with beautiful grain depth.

The fine sawn texture opens the wood grain to allow for optimal coating performance. The thermal modification process and vertical grain structure means Vulcan cladding has superior stability and reduced resin content. All our Abodo products are FSC certified and come with a 15-year warranty on the Vulcan Cladding.

Vulcan thermally modified wood cladding is created from New Zealand plantation timber and engineered with a patented vertical grain orientation for superior weathering characteristics. reSAWN TIMBER co’s Abodo Smooth Face Vulcan Cladding is made using a proprietary brushing technique during manufacturing. Brushing the material opens the wood grain to allow for optimal coating performance. The brushing technique also provides a smooth, modern texture on the face of this unique clear vertical grain modified wood. The thermal modification process and vertical grain structure means Vulcan cladding has superior stability and reduced resin content.

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All our Abodo products are FSC certified and come with a 15-year warranty on the Vulcan Cladding. Accoya® wood is the result of decades of research and development that has brought together a long-established, extensively proven wood modification technique and leading-edge patented technology – acetylation to create a high performance wood, ideal for outdoor use and challenging applications. By significantly enhancing the durability and dimensional stability of fast-growing and abundantly available certified wood species, Accoya® wood provides compelling environmental advantages over slow-growing hardwoods (which are often unsustainably sourced), woods treated with toxic preservative chemicals, and non-renewable carbon-intensive materials such as plastics, steel and concrete. All our CHARRED Accoya® products are FSC certified and come with a 50-year warranty on the wood when used above ground; 25-year warranty when used at/below ground level.

Much of Kebony wood’s enhanced performance characteristics stem from the patented modification process they have adopted. Differing from other modified wood products, Kebony uses furfuryl alcohol as its modifying agent. Furfuryl alcohol is a non-toxic, bio-based fuel that impregnates the wood’s cells through a vacuum pressure treating process. When the impregnation is finished, the resulting cells are slightly changed, and that results in changes to the physical and mechanical properties of the wood byproduct.

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Kebony is beautiful wood recommended by leading architects.

Kebony’s performance has been proven in a variety of applications, including decking and cladding, because of its high-quality characteristics.

reSAWN offers Alaskan Yellow Cedar (AYC) as a sustainable exterior material.

Yellow Cedar trees can be found along the North American Pacific Coast from the California-Oregon border to Southern Alaska.

AYC is highly aromatic and highly decay resistant.

It has exceptional resistance to exterior elements and insects and is easy to work with.

It can be used for exterior wall & roof cladding and interior wall & ceiling cladding.


reSAWN offers Western Red Cedar because it’s one of North America’s great renewable resources.

In addition to it’s prominence as sustainable exterior material, it’s very durable and is one of the lightest commercial softwoods.

It is an expansive and popular tree in the Pacific Northwest region of North America.

The wood is used to build shingles for roofs, siding (cladding) for homes, decks, and furniture among other applications.

Cypress is notable for its color consistency, density and hardness.

Although cypress is a softwood, it grows alongside hardwoods and traditionally has been grouped and manufactured with hardwoods.

The oils in cypress’ heartwood make it one of the most durable woods when exposed to moisture conditions causing decay.

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Cypress trees are natives of the south.

They are found primarily in wet, swampy areas along the Atlantic Coastal Plain from Delaware to Florida.

External Wood cladding is becoming increasingly popular once more as a facing material, replacing brick or rendered finishes with warm and practical facades that are seen as a more sustainable option.

It is used for both internal or external applications, although you must consider the durability of the timber when selecting material for external use.

Wood cladding is generally easy to fix, but do consider final detailing, especially on corner joints and at ground level on external applications.

Choosing external cladding. When choosing any form of board cladding, consider:.

• The choice of species.

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• The size and length of boards available. • The degree of weather protection. • The ease of installation and fixing. • The choice of finish. • The robustness of the material. Softwood continues to be the most popular external wood cladding for most buildings. Western Red Cedar and Siberian Larch, European Larch are naturally durable, but thanks to modern preservative methods, less durable species are also widely used. We have seen the use of exterior painted cladding pre-painted and prefinished, preweathered cladding, charred wood shou sugi ban, Heat treatment (e.g. SetriWood Thermowood®, Plato® wood) and wood modifying processes (e.g. Accoya®, Kebony®) have introduced a new range of softwood products that achieve greater durability without the use of preservatives.

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Durable temperate hardwoods, such as Robinia, European Oak and Sweet Chestnut, are increasingly used.

With the exception of their sapwood, they can be used without treatment.

They can be installed kiln dried or ‘green’, but ‘green’ timber requires special detailing to allow for shrinkage and movement.

Tropical hardwoods are generally stronger, more robust and durable than softwoods for Exterior Wood cladding.

As some of these species may be less well known.

As a leading external wood cladding supplier Timber Focus can offer you many cladding options.

Sustainable timber.


Timber is the most sustainable building product available.

It is naturally renewable – over 97% of softwood timber used in the UK comes from Europe, where the forest area is increasing by the equivalent of 90 football pitches every hour of the day and night.

For reassurance for softwoods and hardwoods look for certification labels like FSC (Forest Stewardship Council) or PEFC (Programme for the Endorsement of Forest Certification).

As a leading timber supplier Timber Focus has a robust timber procurement policy inline with the Government requirements and the European Union Timber Regulation (EUTR).

This information sheet provides general advice only and is not specific to the requirements of a particular building project.

It is the builder’s responsibility to check compliance with Building Regulations and standards.

Choosing materials for the right finish.

The species, grade, and quality of materials you choose have an important bearing on the service life, appearance and maintenance of the cladding. Take into account the number and size of knots (ensuring there are no dead knots) and other defects, such as splits and shakes, when deciding on the final visual appearance of the cladding. Think about the final surface finish you want to achieve when choosing a preservative treatment.

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For example, using a pressurised treatment process may give the timber a green appearance. Some species can be left unfinished and will turn silvery-grey as sunlight bleaches the surface. For a decorated surface, use good quality microporous paint systems, or consider using pre-finished timber cladding. Always follow the manufacturer’s instructions to ensure good coverage and service life.

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Direction of boarding. Timber cladding can be applied in any one of three directions.

Take this into consideration at the time of selection.

Your decision will have an impact on the methods of fixing as well as on the overall look of the façade.

Horizontal boarding.

Diagonal boarding. Provides an alternative appearance.

Overlapping boards are not suitable.


Tongued and grooved boards should be installed tongue upwards. Ensure counter-battening is done to provide ventilation. Remember the cavity. The timber cladding you are fixing to the building is effectively an outer layer of protection against the elements. However, a cavity should be formed behind the cladding to allow any water or moisture that might penetrate the cladding to escape.

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This ensures internal and external surfaces of the wood maintain a similar moisture content, reducing the potential for movement and distortion, allowing ventilation between the inner and outer surfaces.

The cavity should be at least 19mm wide, but may be wider, depending on the thickness of fixing battens.

A weatherproof membrane is usually required to protect the structure, although this may not be needed on masonry.

Breather membrane.

Treated battens fixed to studs or masonry – max 600mm centres 600 mm centres.

Available with overlapped or profiled sections.

The board profile and spacing can provide a variety of design effects, as well as protection for the building.


If using horizontal boarding, consider how the boards will be fixed and jointed to provide good detailing for the building.

Tongued and grooved boards should be installed tongue upwards.

Vertical boarding. Board on board is a popular and versatile arrangement, although shiplap and tongued and grooved profiles are also used.

The tongues need to be long enough to allow.

for slight movement of the timber so that open gaps do not develop with natural shrinkage and expansion.

Other methods of vertical cladding can also be employed by staggering overlaps with boards on top of boards.

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Use softwood battens that are preservative treated and structurally graded to ensure they are able to carry the weight of the board material.

Fix horizontal boards to vertical battens, taking care.

where boards are jointed to ensure they sit securely on sufficient batten width.

Conversely, fix vertical boards to horizontal battens, with vertical ‘counter’ battens to facilitate drainage and ventilation.

Support battens should be fixed at spacings of no more than.

600mm, whether vertical or horizontal, and at no more than 400mm for diagonal boards.

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These spacings will help maintain the overall stability of the cladding.

Horizontal boards.

• Shiplap or feather edge type boards should have a minimum of.

15mm overlap, but allow 2mm gaps between the up-stands for expansion.

• Tongued and grooved boards should have a maximum face width of 125mm, with a 2mm clearance above the tongue for expansion.

Install with the tongue upwards.

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• Open joint boards should have an 8-15mm gap at the ‘water face’.

Chamfered edges allow the boards to overlap slightly, reducing any exposure of the cavity.

Vertical boards. • The face width of tongued and grooved vertical boards should not exceed 125mm.

The most versatile fixing method is board on board.

Any overlap should be a minimum of 20mm.

Diagonal boards. • Shiplap boards are advisable and should be fixed on to battens.


For vertical boards, take into consideration the comments above for overlaps.

To maintain a consistent design appearance, the length and width of the board needs to be considered.

This will vary depending on the species chosen:.

• Most softwoods are available up to a maximum length of 4.8 metres.

• Most temperate hardwoods are available up to around 3.6 metres.

• Tropical hardwoods, depending on the species, are available in maximum lengths of between 2.1 and 4.2 metres.

• Make sure that butt joints always meet on sufficient batten support width.


• It’s essential to use stainless steel nails for species with high tannin content and for timbers installed ‘green’.

This avoids permanent staining due to the reaction on mild steel or galvanised nails.

Screws are the preferred method of fixing for hardwood boards.

Stainless steel screws should be used for timbers installed ‘green’ and/or unfinished:.

• Slight over-sizing of the screw holes will allow for any movement in the wood and prevent splits.

Countersinking screws is also recommended.

• Where ‘green’ wood is used, it may be necessary to fit washers to the screws to maintain the fixing security.


This can become a design feature.

Window and door openings. Openings within a wall require special attention.

These openings need to be in multiples of the board widths to avoid the need to notch or cut the boards and to provide a good appearance as well as allowing for fixings.

Thought also needs to be given to.

the 3-dimensional relationship of any flashings, sills etc.

to allow for adequate drainage of water from behind the cladding, board surface and ends away from the building.

This is an important area of fixing detail, not just aesthetically but functionally, to ensure adequate protection against water.


Some typical corner details are shown in the drawings below.

Breather membrane. Fixing external cladding.

Stainless steel annular ring shank nails are recommended for fixing softwood External Wood cladding:.

• The nail penetration into the batten is generally twice the thickness of the board being fixed and should be punched slightly below the wood’s surface.

• Boards over 125mm overall width should have double fixings.

Treated softwood battens. 8 x 10 mm anti-capillary groove.

8 – 10 mm clearance to board ends.


Treated softwood. 8 – 10 mm clearance board ends.

Mitreing boards at corners is not recommended, as natural movement of the timber will allow the joint to open, causing failure of the surface coating and water ingress.

Mitreing the ends of boards can be considered, but it is advisable to provide a gap between any adjoining surfaces.

Internal and external corners are more easily detailed on vertical boarding.

These can be jointed by ‘tonguing and grooving’ to give added stability and protection.

Treatment against fire.