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Cascadia Western Red Cedar Decking

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PRODUCT Linear Metre Square Metre
40 x 90mm £3.79 £39.89
40 x 140mm £6.77 £46.65

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For more information call 0151 495 3111.


Cascadia Western Red Cedar Decking

Cascadia decking is produced from the very best kiln dried, select tight knot grade Western Red Cedar, grown in the British Columbia coastal region.

It forms part of the Cascadia range of kiln dried Western Red Cedar decking, cladding and boards. This is produced for Silva by Terminal Forest Products, a Canadian primary sawmill and manufacturer with an unparalleled international reputation for superior Western Red Cedar products.

Only the highest quality wood fibre is used in the production of Cascadia decking, so you can be assured that you are buying a consistently high grade select tight knot Western Red Cedar decking product. It is sustainably sourced from well managed forests and supplied with full PEFC chain of custody certification.

At a glance

  • Natural resistance to moisture, decay and insect damage
  • Kiln dried for dimensional stability
  • Solid and sturdy 40mm thickness
  • Coastal grown in the British Columbia region of Canada
  • Silva Recommended Finish - Sansin Dec
    Western Red Cedar looks best in one of these colour tones...
    Natural (Harvest Gold) | Natural Cedar | Espresso

Please ensure when ordering that you make an allowance for wastage. We recommend adding an additional 10-15% over and above your initial requirements.

No other material captures the look and feel of Western Red Cedar decking

Cascadia Decking is Thick

At 40mm, Cascadia is probably the thickest decking available in the UK. The extra thickness provides a number of advantages:

Fewer joists - joists can be spaced at 600mm centres rather than the usual 400mm, resulting in using fewer joists to construct the frame - saving both time and money.

Fewer screws - fewer joists means far fewer screws to insert, again saving time and money.

Solid structure - the added thickness will make your deck feel satisfyingly solid and sturdy underfoot.

Other Uses

Cascadia decking exhibits very little wane or other defects on the reverse of the boards making it suitable for many landscaping and building uses other than just decking. It can be used for constructing garden features such as gazebos, pergolas, play equipment etc.

Kiln Dried

Cascadia Western Red Cedar is kiln dried to a moisture content of 16-18% (+/-2%), the optimal moisture content for external decking in the UK. Among its many benefits over air drying, the kiln drying process enables the boards to dry uniformly to achieve optimum dimensional stability. It also enables immediate application of coatings and minimises site acclimatisation. Read more about the benefits of kiln dried timber.

A Complete Range of Decking Materials

Silva stocks everything you need to build a superb Western Red Cedar deck. In addition to decking, our product range includes (from the ground up) weed suppressant membrane, post bases, concrete piers, structural timbers (beams/joists), structural screws, joist hangers, connectors, stainless steel deck screws, Western Red Cedar posts and railing components , and a wide range of coatings and cleaning products.

Silva Timber: A Leading Importer of Western Red Cedar

Silva is one of the UK’s largest importers of Western Red Cedar. With direct links to some of the biggest and best primary sawmills of Western Canada we can offer a wide range of Western Red Cedar products in large volumes as well as smaller orders. If you are a manufacturer or reseller then talk to us about your Western Red Cedar requirement.

About Western Red Cedar

Western Red Cedar - the Ultimate Outdoor Wood

Western Red Cedar is synonymous with beauty and durability; however it has a number of natural attributes that make it the ultimate outdoor wood.


• Naturally durable species

• Durability Class 2 (BS EN 350:2)

• Proven life expectancy of 60+ years

Dimensional Stability

• Twice the stability of most commonly available wood species

• Does not excessively shrink, swell or warp through changes in moisture or temperature

• Lies flat, stays straight and holds fasteners tightly


• Produces long, lightweight lengths

• Fine grain and uniform texture make it easy to cut, drill, sand, saw and insert screws and nails using common tools

• Readily accepts many types of wood finish due to its lack of pitch and resin

Natural Preservative

• Natural resistance to moisture, decay and insect damage

• One of the world’s most durable wood species

• Lasts for decades, even in harsh environments

Read more

Finishing & Protection

It is recommended that a finish is applied to all surfaces, including ends, before installation. The type of coating will be determined by the final finish and appearance desired.

Why Pre-finish?

  • Enhances the natural beauty of wood
  • Ensures a consistent finish
  • Applied in factory conditions
  • Long lasting protection against weathering
  • Simple maintenance routine
  • Reduces onsite labour costs

Sansin Enviro Stains

Easy to apply and maintain, Sansin Enviro-stains deliver outstanding performance. Sansin's range of wood protection products are available in 80 colour tones

What is weathering?

There is a risk involved when leaving wood exposed to the elements. During the weathering process wood can appear unsightly as the material can blacken due to moisture getting into the fibres and pulling out tannins and extractives. Finish protects the wood from moisture absorption and UV degradation.

Take advantage of Silva's sanding and factory pre-finishing service

Now you can buy decking pre-sanded on the surface to save the hassle of onsite preparation work

The secret to a perfect finish is to sand the surface prior to applying the coating. The more care taken with preparation, the more finish will penetrate the wood, providing an even, consistent and long-lasting finish. Studies have proven sanding can extend the life of a finish by up to 3 times compared to an unsanded surface.

Click here to find our more about the importance of sanding.

For a pre-sanding quote for your project feel free to contact us.


Architect Knotty Grade

Cascadia is consistent, well manufactured Western Red Cedar decking that offers good quality and an attractive appearance at a reasonable price. It is made in Canada by a Western Red Cedar Lumber Assocation (WRCLA) member mill and exceeds the 'Architect Knotty' grading standards set by WRCLA.

The main feature of this product is the inclusion of well interspersed sound tight (live) knots. Occasional small 'not firmly fixed knots' are also permitted, however they are very few in number and will not detract from the overall appearance. A small percentage of boards will exhibit some wane on the reverse, however this will not be visible once the boards are installed.


Western Red Cedar is the ultimate green building material. It is legally, responsibly and sustainably harvested in the publicly managed forests of British Columbia, Canada. Less than 1% of standing timber is harvested each year.

For each tree harvested, three are replanted to ensure the forests will exist in perpetuity. Western Red Cedar has a low impact on the environment throughout its life cycle. It requires significantly less energy to produce than man-made alternatives and is bio-degradable.


  • FSC
  • PEFC
  • Trada member
  • Responsible purchaser
  • Cedar Shake & Shingle Bureau
  • Secured by