Radiata pine weatherboards are a trusted and timeless cladding solution for homes across the country. Locally sourced, cost-effective, and highly versatile, this softwood performs exceptionally well in our climate when installed and maintained correctly.
Whether you’re a professional builder or a DIY homeowner, this comprehensive guide will help you maximise the performance and lifespan of your radiata pine cladding across all profiles, including bevel-back, rusticated, and vertical shiplap.
Why Choose Radiata Pine Weatherboards?
Radiata pine is a plantation-grown softwood native to New Zealand. It offers excellent stability, workability, and cost efficiency. When treated to H3.1 or H3.2 and correctly coated, it provides years of reliable exterior protection.
At South Pacific Timber, we offer a full range of premium weatherboard profiles, sustainably sourced and fully compliant with NZS 3602 standards.
Timber Handling & Storage Best Practices
Proper storage and handling are critical to maintaining the quality of timber prior to installation.
Do:
- Store flat with even support at 900mm centres.
- Raise at least 150mm above ground level with airflow underneath.
- Cover with a breathable, waterproof wrap (not plastic).
- Store in a dry, shaded space away from rain or sun.
- Acclimatise on-site for 48 hours before use.
Don’t:
- Store directly on soil or concrete.
- Leave timber exposed to rain or intense sunlight.
- Keep timber tightly wrapped without ventilation.
- Install damp or swollen boards.
Pro Tip: Timber should have a moisture content between 12% and 15% at the time of installation.
Installation Guidelines for All Weatherboard Profiles
Whether you’re using bevel-back, rusticated, or vertical shiplap, follow these universal tips:
Fixing Requirements:
- Use stainless steel (304/316) or hot-dip galvanised fasteners.
- Nail once per board per stud or batten.
- Avoid over-nailing or penetrating board laps.
Seal All Cut Surfaces:
- Seal all end cuts, mitres, and rebates with two coats of a suitable oil-based primer or timber preservative.
Cavity System (Recommended):
- Use a 20mm drained and ventilated cavity system as per NZBC E2/AS1.
- Ensure flashings are installed at all junctions and penetrations.
Ground Clearance:
- Minimum 100mm above paved surfaces.
- Minimum 175mm above unpaved surfaces.
Moisture Guidelines:
- Do not install if boards are wet or if recent rainfall has occurred.
- Moisture content should be below 16% before installation.
Painting & Coating Guidelines for Longevity
Protecting your weatherboards with the right coating system is essential.
First Coats:
- Topcoat within 4–6 weeks of installation.
- Re-prime boards exposed beyond this window.
- Use a premium acrylic exterior paint with two finish coats.
Repainting Cycle:
- Recoat every 5–7 years depending on sun and weather exposure.
- Use light colours (LRV 45% or greater) to minimise heat movement.
Surface Preparation:
- Fill nail holes and lightly sand.
- Clean with mild detergent and soft brush.
- Never paint damp or wet timber.
Annual Maintenance Checklist
Stay ahead of wear and tear with a yearly maintenance routine:
- Wash down cladding with a soft brush and mild cleaner.
- Inspect all flashings, joints, and trims.
- Re-seal or repaint exposed or damaged areas.
- Remove nearby vegetation.
- Check drainage and ground clearances.
- Rinse cladding more frequently in coastal areas to remove salt.
Common Mistakes to Avoid
- Installing boards too close to the ground.
- Failing to seal cut ends.
- Using non-compatible or corroding fasteners.
- Leaving timber exposed to weather pre-installation.
- Painting in high humidity or wet conditions.
- Blocking board laps, impeding drainage.
Final Thoughts & Expert Support
Radiata pine weatherboards remain one of New Zealand’s most reliable cladding solutions when installed and maintained with care. By following these best practices, you can ensure your weatherboards stand the test of time.
Explore our full range of radiata pine weatherboards or get in touch with a timber specialist for personalised guidance and technical support.