Choose timber when natural feel and repairability matter, and composite when lower routine maintenance matters more. In either case, good drainage, ventilation, correct joist spacing, corrosion-resistant fixings, and local fire or pool rules determine long-term performance.
This guide is written for South Africa, Australia, New Zealand. Always check local codes, product specifications, licences, and site conditions.
Step by step
Map the exposure
Note sun, shade, salt air, rainfall, bushfire or wildfire risk, pool splash, ground clearance, and airflow.
Compare whole-life care
Price cleaning, coatings, board replacement, fasteners, and disposal over the years you expect to own the deck.
Check the system
Confirm span tables, joist centres, end gaps, ventilation, fixing zones, and compatible substructure before buying boards.
Test a sample
View samples wet and dry, in full sun, and beside the house. Check heat, glare, texture, and slip under realistic conditions.
Expert tips
- Dark boards can become very hot in strong sun.
- Near the coast, fixing and connector corrosion resistance is critical.
- Keep the substructure accessible for inspection.
Common questions
Is composite decking maintenance-free?+
No. It usually needs less refinishing than timber, but it still needs cleaning, drainage, ventilation, and occasional stain or mould treatment.
Which decking lasts longest?+
Service life depends on product quality, exposure, installation, ventilation, and maintenance. A well-detailed system usually outlasts a premium board installed poorly.
Can decking be installed directly on soil?+
Boards should not sit directly on soil. Use an engineered, drained, ventilated support system suitable for the site.
Stop if the work involves structural uncertainty, hazardous materials, heights, live services, gas, serious water damage, or regulated work. Local rules differ—use an appropriately licensed professional where required.