Timber Flooring Installation Guide - New Zealand Standards

Pre-Installation Preparation

• Moisture Testing: Subfloor moisture content must be below 18% (NZS 3602)
• Acclimatisation: Store timber in installation environment for 7-14 days
• Subfloor Preparation: Ensure level within 3mm over 3m span
• Ventilation: Minimum 150mm clearance under suspended floors
• Vapour Barrier: Install where required by NZ Building Code

Installation Process

• Direction: Install perpendicular to floor joists for maximum strength
• Starting Point: Begin from longest, straightest wall
• Expansion Gaps: Leave 10-15mm around perimeter for seasonal movement
• Staggering: Stagger end joints by minimum 300mm
• Fixing: Use appropriate fasteners every 300-400mm along joists
• Secret Nailing: Nail at 45° angle through tongue for invisible fixing

NZ Building Code Compliance

• Structural Requirements: Follow NZS 3604 for timber framing
• Fire Safety: Ensure compliance with NZBC Clause C (if applicable)
• Moisture Management: Follow NZBC Clause E2 requirements
• Thermal Performance: Consider insulation requirements under NZBC Clause H1

Finishing Your Timber Floor

Sanding Preparation

• Initial Sanding: Start with 80-100 grit, progress to 120 grit
• Dust Removal: Vacuum thoroughly between each grit change
• Final Sand: Finish with 150 grit for smooth surface
• Tack Cloth: Remove all dust before applying finish

Staining Process

• Test First: Always test stain on off-cut or inconspicuous area
• Even Application: Work with the grain using lint-free cloth
• Drying Time: Allow 6-8 hours between coats in NZ climate
• Light Sanding: Lightly sand with 220 grit between stain coats

Protective Coating Options

• Polyurethane: Excellent durability, 2-3 coats recommended
• Oil-based Finish: Natural look, requires regular maintenance
• Water-based Finish: Low odour, quick drying, clear finish
• Wax: Traditional finish, requires frequent reapplication

Application Best Practices

• Temperature: Apply between 15-25°C with low humidity
• Ventilation: Ensure adequate airflow during application
• Brush Quality: Use high-quality natural bristle brushes
• Thin Coats: Apply multiple thin coats rather than thick ones
• Curing Time: Allow 7-14 days for full cure before heavy use

Maintenance Schedule

• Daily: Sweep or vacuum to remove grit and debris
• Weekly: Damp mop with appropriate floor cleaner
• Annually: Deep clean and assess for wear patterns
• 3-5 Years: Consider recoating high-traffic areas
• 10-15 Years: Full sand and refinish as needed