Installation

DuraDeck installation is more complex than fencing and requires a proper substructure. We strongly recommend professional installation for most projects. DIY is possible for experienced builders familiar with hidden fastener decking systems.

Installation Overview

1. Build a code-compliant substructure (pressure-treated wood, aluminum, galvanized iron, or WPC joists)
2. Install start clips at the starting edge
3. Insert stainless steel clips (TW-E) into the groove on first board, position on joist, screw down
4. Slide next board into clips, advancing across the deck
5. Add locking clips mid-span to secure boards in place
6. Use double joists at butt seams — each board end must sit on its own joist
7. Maintain proper expansion gaps (see below)
8. Finish edges with fascia boards or L-corner trim

Critical Installation Requirements

Failure to follow these requirements may void the warranty. Professional installation is strongly recommended.

• Hidden fasteners MUST be used at every joist — face screwing voids warranty
• Double joists required at end-to-end butt seams (each board gets its own joist)
• Joist spacing maximum 350mm (14″) on-center for perpendicular installation
• For angled installations (45°, 30°), reduce joist spacing — see installation guide
• Minimum 25mm (1″) ventilation clearance under the deck surface
• Use DuraDeck system clips and components only — mixing brands voids warranty
• Acclimate boards on-site for at least 2 days before installation
• Stair treads require SOLID profile decking (not DuraDeck hollow) — special order if needed

Expansion Gapping

Composite expands and contracts slightly with temperature. Proper gapping prevents buckling in summer and separation in winter.

• Board width-to-width gap: determined by the deck clip itself (installed automatically)
• Board end-to-end gap: 5–10mm typical for Metro Vancouver installations, depending on board length and installation temperature
• Gap between deck and solid objects (walls): 6–13mm
• Joist abutting gap: 10–20mm depending on temperature

Full temperature-vs-length gap table is in the COOWIN installation guide. We provide this guide with every DuraDeck purchase. For extreme cold-weather installations (below 5°C) or hot summer installations (above 25°C), gap sizing changes meaningfully — consult the guide or our team.

Installation Time Estimates

These estimates assume an existing substructure or simple ground conditions. Complex projects with multiple levels, railings, built-in seating, or stairs take longer.

Download the Installation Guide

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Limited Warranty

What’s Covered

• Material manufacturing defects
• Cracking, splintering, delamination, or rot under normal use
• Structural damage from termites or insects
• Substantial color fading beyond normal weathering

What’s Not Covered

• Damage from improper installation or failure to follow the installation guide
• Use of non-DuraDeck system components (mixed-brand fasteners, joists, etc.)
• Face-screwing instead of hidden fasteners
• Use of hollow decking as stair treads
• Storm damage (wind, hail, flooding, falling trees)
• Fire damage, including from barbecues, fire pits, or reflected Low-E window sunlight
• Physical impact damage
• Vandalism, intentional damage, or misuse
• Normal weathering, slight color change, and stabilization in the first 12–16 weeks

Material Lifespan vs. Warranty Period

The 25-year warranty is our financial commitment to replace defective product at prorated coverage levels. The composite material itself is engineered to last 30+ years under normal conditions when properly installed and maintained. Many composite decks continue performing well beyond the warranty period.