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How to Install Western Red Cedar Shingles: A Comprehensive Guide for Roofing Contractors

How to Install Western Red Cedar Shingles: A Comprehensive Guide for Roofing Contractors

Western Red Cedar Shingles are an exceptional choice for any roofing or cladding project. Known for their stunning aesthetic and sustainability, these shingles are sawn from the highest quality British Columbian cedar logs. They provide a durable, hard-wearing solution with natural thermal insulation. Over time, the warm red-brown tones gracefully age into a distinguished silver-grey, enhancing the visual appeal of any structure.

For roofing contractors, understanding the installation process of these shingles is crucial. This guide will take you through each step, ensuring a professional and effective installation.

 

Step 1: Preparing the Underlay

Non-Breathable Underlay (Black) with 25mm Eaves Vent System

  • Install Continuous Rafter Roll: Begin by installing the continuous rafter roll, over fascia ventilator, and felt support tray. This setup directs airflow below the underlay into the roof space. 
  • Dress and Fix Underlay: Dress the underlay down to the bottom edge of the felt support tray and secure it using self-adhesive tape.

 

Vapour Permeable Underlay (Red) with 25mm Eaves Vent System

  • Install Felt Support Tray: Start by installing the felt support tray.
  • Fix Over Fascia Ventilator: Position the over fascia ventilator over the felt support tray to direct airflow in the batten space, above the underlay, and below the shingles.
  • Dress and Fix Underlay: Dress the underlay down to the bottom edge of the felt support tray, behind the over fascia ventilator, and secure with self-adhesive tape.

 

Step 2: Battens Installation 

Non-Breathable Underlay 

  • No Counter Batten Required: Non-breathable underlay does not require counter battening. 
  • Position the First Batten: The first batten should be positioned based on the batten gauge plus half the thickness of the batten. Subsequent batten placement is determined by the roof pitch. 

    Vapour Permeable Underlay with Counter Battens 

    • Counter Batten Installation: Counter battening is necessary to allow ventilation between the batten space above the underlay and below the cedar shingles. 
    • Position the First Batten: As with non-breathable underlay, position the first batten based on the batten gauge plus half the batten's thickness. Follow the roof pitch for subsequent battens.

     

    Step 3: Setting Out 

    First Course Placement

    • Minimum Overhang: Ensure a minimum overhang of 38mm at the verge and either 38mm overhang at the eaves.
    • Double Course at Eaves: A double course is necessary at the eaves, and a broken bond pattern should be maintained throughout.

     

    Step 4: Fixing the Shingles

    Nailing or Stapling 

    • Twice Nailed or Stapled: Shingles should be either twice nailed or stapled.
    • Recommended Fixings: Use a 31mm x 1.8mm stainless steel ring shank nail or ShingleFix staples with a Paslode gun for quicker installation. 
    • Position Fixings Correctly: To avoid splitting, position fixings 19mm in from the edge of the shingle and 38mm up from the butt of the course above.

     

    Step 5: Installation Process

    Batten Position

    • Chalk Line Marking: Use a chalk line to highlight the batten position for accurate nailing or stapling. 
    • Maintain Bond Pattern: Ensure the broken bond pattern is consistent throughout the roof and maintain a 5mm gap between each cedar shingle.

     

    Step 6: Ridges

     Cutting and Fixing 

    • Maintain 125mm Gauge: When you reach the ridgeline, cut the shingles to maintain the 125mm gauge.
    • Double Ridge Course: Due to the thickness of the underlying shingles, use a double ridge course, fixed with 45mm x 2.65mm nails.

     

    Step 7: Finishing Touches

    Uniform Appearance 

    • Same Gauge for Ridges: Use the same gauge for ridges as for the shingles to ensure a uniform appearance.
    • Pre-formed Hips and Ridges: For faster installation, consider using pre-formed hips and ridges. 

    Conclusion

    Installing Western Red Cedar Shingles provides an elegant and sustainable roofing solution, enhancing the value and aesthetic appeal of any building. With the right tools and a clear understanding of the installation process, any roofer can achieve professional results. Embrace the natural beauty and durability of Western Red Cedar Shingles for your next project, and enjoy the benefits of a high-quality, sustainable roofing material.

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