Western Red Cedar Cladding

Overview

Specialising in Western Red Cedar, Silva Timber are committed to providing timber products sourced from the finest primary sawmills in British Columbia, Canada, producing consistently high quality Western Red Cedar that exceeds grading rules.

When compared to other cladding & trim materials, Western Red Cedar makes perfect sense.

Highly durable, low shrinkage factor, naturally resistant to decay, dimensionally stable and light and easy to work with, Western Red Cedar is a truly wonderful material and has long been the choice for discerning architects, builders and homeowners.

Brochure PDF
Available Profiles

Silva Timber can provide Western Red Cedar No.2 Clear & No.4 Clear in custom machined profiles to your exact specification. For more information or for a competitive quote please contact our customer service team.

Grading

 

Clear Vertical Grain

No.2 Clear & Better

No.4 Clear

Description

 

 

 

 

The finest quality 
Western Red Cedar available

A stunning appearance with outstanding properties. Made from fine-grained Western Red Cedar heartwood, providing a consistently flawless product from piece to piece.

Exceeds grading rules for a reliable, high quality material

Our No.2 Clear & Better is of the highest standard and most consistent available. Minimal natural characteristics are permitted, resulting in an exceptional clear grade product.

Superb value for our own hand selected clear grade cedar

Occasional knots present which do not detract from overall look. Silva Timber’s own grading standards are used when hand selecting pieces to ensure consistency of quality.

Features

Drying

Kiln Dried

Kiln Dried

Kiln Dried

Grading

At Source. 
Quality Control at Silva Timber

At Source.
Quality Control at Silva Timber

At Source.
Quality Control at Silva Timber

Grain Width

Very narrow

Average 6 rings / 25mm

Wider grain width permitted

Grain Slope

Vertical

1 in 8

1 in 4

Irregularities

Knots

None

Up to 4 x 13mm knots

Up to 4 x 25mm knots
Up to 8 equivalent smaller knots

Soft knots 

None

Reverse side only

Up to 9.5mm

Face or reverse side
Up to 25mm

Pockets

None

Small

Up to 5 Medium sized

Warp

None

None

Light

Checks

None

None

Seasoning

Wormholes

None

None

Very small

White specks

None

None

Firm

Split

None

None

Short

Sap Stain

None

None

50% medium

Heart Stain

None

None

Medium

Total Permitted
Irregularities

None

Face Side: Up to 3
Reverse Side: Up to 4

More irregularities permitted

Grading Notes

Highest grade of cladding produced. Some pieces may exhibit a few minor characteristics that do not detract from their high appearance and quality.

15% of pieces in shipment may contain 4 of the above irregularities on the face side. Characteristic soft knots may extend into the opposite face.

Will permit a larger amount of characteristics compared to No.2 Clear & Better. Occasional knots present which do not detract from overall look.
Unless otherwise specified, characteristics on the reverse face can be slightly in excess of those allowed on the face.


401.   No 2 Clear & Btr (B & btr or Prime)

         Rough KD, AD or GRN, as ordered

         VG or RG, as ordered

Shall be sound timber, well manufactured.  Three (3) irregularities permitted on face side, four (4) on reverse side, including corresponding half of edges or equivalent, for each 12 lineal feet (3.7m), based on 8” (203mm) widths.  Shall average at least six (6) rings of annual growth to the inch (25mm) on either one end or the other of the piece.  If VG is ordered, widths 10” (254mm) and wider must show vertical grain for at least 2/3 of the face.

Will admit the following or their equivalent:

         Variation in sawing: slight in occasional piece(s)

         Knots: sound and tight.

                                    Face Side              Reverse side        

Under 3” (76mm) thick   ½” (13mm)             ¾” (19mm)

3” (76mm) and thicker    ¾” (19mm)             1” to 2” (25 to 51mm) according to              thickness of piece

Characteristic Soft Knots: on reverse side and corresponding half of edges, approximately ½ the allowable size for sound tight knots.

Split: approximately width of piece. 

Slope of Grain: maximum 1 in 8. 

15% of pieces in shipment may contain four (4) of the above irregularities on the face side and characteristic soft knots (as described above) may extend into the opposite face.

 

401 - a.       No. 4 Clear

                  Rough KD, AD or GRN, as ordered

                  VG or RG, as ordered

Recommended and widely used where general utility purposes are of more importance than appearance.  Timber shall be well manufactured.  Grade descriptions are based on a piece 8” (203mm) wide and 12 lineal feet (3.7m) in length.  Grade is determined from the better face and corresponding half of edges.  The number of characteristics in larger or smaller pieces may vary in proportion to the size of the piece.

Unless otherwise specified, characteristics on the reverse face can be slightly in excess of those allowed on the face.

Will permit the following characteristics or their equivalent:

         Knots: four (4) or equivalent smaller:

                                                               Face Side

         Under 3” (76mm) thick                     1” (25mm)

         3” (76mm) and up to less than           1 ½” (38mm)

                  5” (127mm) thick

         5” (76mm) and thicker                      2” (51mm)

 

         Pockets: five (5) medium or equivalent.

         Split: short.

         Checks: seasoning.

         Warp: light.

         White Speck: firm; 10% of face, 25% of reverse face.

         Wane: 1/8 width, 1/6 length, maximum ¼ thickness

Wormholes: pin, 15 per sq. ft. (305 x 305mm) on face, 30 per sq. ft. on reverse face.

Occasional piece(s) in shipment may have a 4” (102mm) cut out, 4’ (1.2m) or more from either end in pieces 12’ (3.7m) and longer.

 

WRC Siding

408.   Siding (Weather Boarding)

KD, AD or GRN, as ordered

VG or RG, as ordered

Grades based on 1 x 6 (25 x 152mm), 12’ (3.7m) in length.  Rule to apply proportionally on narrower or wider stock.

409.   No 2 Clear & Btr (B & btr or Prime) Siding

Shall be sound timber, well manufactured, suitable for paint.

Will admit the following or their equivalent:

         Torn Grain: medium.

         Scant Tongue: not more than 1/6 (2mm) scant.

With the above will admit one of the following or their equivalent:

Knots: three (3), sound and tight, approximately ½” (51mm) or one (1) sound and tight, approximately ¾” (19mm).

Checks: two (2) seasoning, each approximately 6” (152mm) long, none through

Sap Stain: medium.

15% of shipment will admit the following or their equivalent:

         Skips in Dressing: 15% of face, in occasional piece(s).

         Scant Tongue: not more than 1/8” (3mm) scant.

         And one of the following or equivalent:

         Knots: three (3), sound and tight, approximately 1” (25mm).

         Checks: seasoning, none through.

A piece 12’ (3.7m) and longer may have an irregularity located 4’ (1.2m) or more from the end of the piece, which can be cut out without wasting more than 2 ½” (64mm) in length, provided balance of the piece is practically equal to No. 2 Clear and Better.

Click here for Technical Abbreviations

Click here for Grading Definitions

 

British Standard Information

Natural Durability Class BSEN350:2 - Class 2 'Durable' Sapwood Treatability Class BSEN350:2 - Class 2 'Moderately easy to treat'

Species Information

Wood type

Softwood

Environment 

FSC Certification: Clear Vertical Grain, Select Tight Knot
PEFC Certification: No. 2 Clear, No. 4 Clear

Distribution

A tree of the northern Rocky Mountains and Pacific North-west; its full range extends from Alaska southwards to California, and eastwards along many of the interior ranges of British Columbia, northern Washington, Idaho and Montana to the western slope of the continental divide.

The Tree

The largest of the so-called cedars, it grows to a height of 45m to 75m with a diameter of 1m to 2.5m.

The Timber

The sapwood is narrow and white in colour, and the heartwood is reddish-brown. When freshly felled, the heartwood often displays a marked variation in colour; that from the centre of the log may be a dark chocolate-brown changing to salmon pink nearer the sapwood, or the wood may be variegated with alternate dark and light zones. After conventional high temperature kiln drying, the wood assumes a uniform reddish-brown tone, but after long exposure to weather the colour is lost, and the wood becomes silver-grey. This weathered appearance is sometimes purposely sought by architects, but a further peculiarity of the wood is its ability to take and hold stain of the finest tint without discolouration. The wood is non-resinous, straight-grained, somewhat coarse- textured and exhibits a fairly prominent growth-ring figure It is soft, rather brittle, aromatic, especially when wet and light in weight, about 390 kg/m³ when dried.

Drying

Thin sizes dry readily with little degrade, but the timber generally tends to hold its moisture at the centre and care is needed with thick stock to avoid internal honey-combing and collapse. The timber holds its position well after drying with practically no tendency to warp and check. while movement due to shrinking and swelling in changing atmospheres is small.

Strength

Its light weight and soft timber contributes to low strength properties and compared with European redwood (Pinus sylvestris) it is some 20 to 30 per cent inferior in bending strength, and about 1 5 per cent less stiff. It is also much less resistant to splitting and indentation on side grain than redwood.

Working Qualities

Good - The timber works easily with both hand and machine tools, but its relatively brittle nature, which can cause splintering during some operations, and its soft character, which can lead to chip-bruising, usually means that care is needed in order to obtain the best results during mortising, planing and moulding. A good finish can be obtained, but cutters must be kept sharpened.

Durability

Durable

Treatability

Extremely difficult
Difficult (Sapwood)

Moisture Movement

Small

Abrasions

Medium

Density (mean, Kg/m³)

390 ( )

Texture

Coarse

Availability

Readily available at timber merchant

Price

Medium

Chemical Properties

Fine dust may be irritant. An acidic timber which may corrode metals under damp comditions and cause iron staining.

Use(s)

Cladding, Decking, Joinery - Exterior

Colour(s)

Reddish brown (Ages to silver grey if left unprotected)

 

Source: http://www.trada.co.uk

FSC & PEFC Certification

Clear Vertical Grain & Select Tight Knot - FSC Certified.
No.2 Clear & No.4 Clear - PEFC Certified

Forest Stewardship Council (FSC) Accreditation

FSC is a world-wide, independent, non-profit, non-governmental organisation representing environmental and social groups and the timber and forestry industry. It aims to generate certification of forestry activity that incorporates clear guidelines and standards covering social, environmental and economic aspects of forest management.

Established in 1993 as a response to concerns over global deforestation, FSC is widely regarded as one of the most important initiatives of the last decade to promote responsible forest management worldwide

The FSC label provides a credible link between responsible production and consumption of forest products, enabling consumers and businesses to make purchasing decisions that benefit people and the environment as well as providing ongoing business value.

Chain of Custody (CoC)

The FSC Chain of Custody (CoC) certification system provides an audit trail from forest to final use. The rigour of the system is ensured by regular independent inspection at all stages in the supply chain.

FSC chain of custody (CoC) tracks FSC certified material through the production process - from the forest to the consumer, including all successive stages of processing, transformation, manufacturing and distribution.

Only FSC CoC certified operations are allowed to label products with the FSC trademarks. The FSC label thus provides the link between responsible production and consumption and thereby enables the consumer to make socially and environmentally responsible purchasing decisions.

Silva Timber Products meets the requirements for FSC Chain of Custody Standard FSC - STD - 40 - 004 (2004) within the BM TRADA Certification Limited Scheme for TRADA - Trak chain of custody certification

Certificate number:- TT-COC-002296

 

Schemes Programme for the Endorsement of Forest  Certification  (PEFC)

The PEFC Council is an independent, non-profit, non-governmental organisation founded in 1999 which promotes sustainably managed forests through independent third party certification. The PEFC provides an assurance mechanism to purchasers of wood and paper products that they are promoting the sustainable management of forests.

PEFC works throughout the entire forest supply chain to promote good practice in the forest and to ensure that timber and non-timber forest products are produced with respect for the highest ecological, social and ethical standards. Thanks to its  eco-label, customers and consumers are able to identify products from sustainably managed forests.

Silva Timber meets the requirements for PEFC Chain of Custody within the BM TRADA Certification Limited Scheme for TRADA - Trak chain of custody certification.

Certificate number: BMT-PEFC-0319

Finishing and Maintenance

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

Finish protects the wood from moisture absorption and UV degradation. It helps prevent staining caused by mildew and extractives and will increase the service life of the timber.

Consider one of our stunning finishes from the Sansin exteriors range. Click here to view the Sansin brochure.

Or a wide range of coating and stains are available to view here.

Silva Timber also offer a pre-finishing service, reducing installation time and on-site preparation.

Feel free to discuss your finish requirements with our customer support team on 0151 495 3111 or 01895 271 300. Alternatively email enquiries@silvatimber.co.uk.

Fire Treatment

 

Unique Fire Protection

 
When you need to comply with Building Regulations on fire protection, Silva can offer timber products impregnated with fire retardant treatment.  Specify either DRICON® for interior or weather protected situations or NON-COM® EXTERIOR for exterior or severe damp situations.

These proven industrial pre-treatments for timber and related substrates are applied under controlled conditions at the Arch Timber Protection’s ISO certified Fire Retardant Treatment Centre in Castleford.

The standard lead time for both DRICON® and NON-COM® EXTERIOR fire retardant treatments is 8 weeks.  Treatments can be applied to kiln dried Western Red Cedar cladding, trim, decking, shingles and shakes; Siberian Larch cladding and Eastern White Cedar shingles. Please contact us for further information or a quote.

Making sure you specify the correct fire protection is vital. Click here for the main considerations when specifying fire retardant protection for timber,that can help save fire damage costs and people's lives.

For detailed Frequently Asked Questions please click here.

 

 

 

NON-COM® EXTERIOR

Fire Retardant Treated Timber for Exterior or Severe Damp Situations


NON-COM® Exterior treated timber has been impregnated with NON-COM® Exterior fire retardant, a leach resistant, polymer based formulation which is an approved Type LR (leach resistant) formulation in the Wood Protection Association (WPA) Flame Retardant Manual.

NON-COM® Exterior is a Leach Resistant (type LR) fire retardant treatment suitable for exterior or severe damp situations without the need for a protective coating. However an approved coating can be applied if required. Ensure the coating to be used is compatible with NON-COM Exterior fire treated timber.
NON-COM® Exterior is available to conform with either Class B or Class C certification, depending on the application requirements. 


  • Allows you to meet fire regulations with a commercially proven, global product backed by extensive independent test data.  
  • Meets all relevant British and European Standards.
  • Fully fire tested in accordance with European Standards (Euroclasses) under the Construction Products Directive and classified in accordance with EN 13501-1.
  • Fully tested to BS476, Part 6 'Fire Propogation Test' and Part 7 'Surface Spread of Flame' .
  • Excellent appearance - leaves the appearance of the natural timber product virtually unchanged. 
  • Can be used externally, with or without a coating. 
  • Waterbased formulation applied by vacuum-pressure impregnation in factory controlled conditions, to ISO 9001 Quality and ISO 14001 Environmental standards. 
  • Kiln dried to end use moisture content. No strength reduction of treated timbers, and no corrosion of metal fastenings and fixings. 
  • Specification writing service available.

Silva Timber's Non-Com fire retardant treatment service provides the following assurances and benefits. When comparing our service to competitors, be sure to check the following are offered for a like-for-like comparison

  • Long history of proven performance
  • Accepted by the National House Building Council (NHBC) Building Control Service for exterior timber cladding
  • Independent classification reports for each timber species, timber thickness, for use with or without air gaps - BS EN 13501-1
  • Products listed by the UK Wood Protection Association
  • Products approved by the Fire Protection Association
  • Lasts the lifetime of the building with no maintenance - meets current FR durability standards - tested to TS 15912
  • Applied by an ISO 9001 and ISO 14001 accredited company
  • Applied to all faces of the timber product
  • Applied by a controlled impregnation process
  • From a supplier operating to the UK Wood Protection Association Quality Scheme
  • Treated with products manufactured by the supplier
  • Available for a wide range of species
  • Reduces smoke generation
  • Non-corrosive to metal fastenings
  • Does not reduce the strength of the timber
  • Non-hygroscopic - does not absord water or give rise to efflorescence
  • Can be used for exterior timbers without a protective coating
  • Treated products flee from surface salt deposits
  • Treated products have enhanced biological durability

 

 

 

DRICON®

Fire Retardant Treated Timber for Interior and Weather Protected Exterior Situations


DRICON® treated timber and sheet materials have been impregnated with DRICON® fire retardant, a water-based formulation which is an approved Type HR humidity resistant formulation in the Wood Protection Association (WPA) Flame Retardant Manual.

DRICON® is a Humidity Resistant (type HR) fire retardant treatment suitable for interior and weather protected exterior applications with or without a coating to the fire treated timber or plywood. It can only be used in an external situation prone to direct wetting if a well maintained protective coating/paint/stain is applied. Ensure the coating to be used is compatible with DRICON® fire treated timber/plywood as appropriate.

Please be aware DRICON® is not recommended for application on Western Red Cedar.
 
 

  • Allows you to meet fire regulations with a commercially proven global product backed by extensive independent test data.
  • The ONLY BBA certificated fire retardant treatment for timber (Certificate No 87/1841).
  • Fully fire tested in accordance with European Standards (Euroclasses) under the Construction Products Directive and classified in accordance with EN 13501-1.
  • Fully tested to BS476, Part 6 'Fire Propogation Test' and Part 7 'Surface Spread of Flame' .
  • Meets all relevant British and European Standards including the Construction Products Directive for panel products for used in permanent constructions.
  • Water based formulation applied by vacuum-pressure impregnation in factory controlled conditions, to ISO 9001 Quality and ISO14001 Environmental standards.
  • Non-hygroscopic formulation - unaffected by high and fluctuating relative humidities.
  • Does not significantly reduce strength of treated timber, non-corrosive to metal fastenings and fixings, does not affect paint finishes and adhesives, and is maintenance-free.
  • Specification writing service available.

 

To discuss your requirements, please feel free to contact our customer support team on 0151 495 3111 (Cheshire) or 01895 271 300 (W.London).

Case Studies
Western Red Cedar Cladding Tesco Widnes
Western Red Cedar Cladding & Decking Self Build Property Western Red Cedar Cladding Orkney Islands Western Red Cedar Cladding Jessie Hughes VIllage Hall
Download BIM Object Files - NEW

SIlva Timber are pleased to release Western Red Cedar Cladding & Trim BIM Objects - compatible with Revit.

Download BIM Objects. (zip file)

NBS Specification Information

Western Red Cedar Cladding & Trim - NBS Specification

Call for more information - 0151 495 3111