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Decking

Timber and composite decking — installation, repair, and maintenance

Decking provides an elevated outdoor platform constructed from timber or composite materials. It includes the subframe (joists), decking boards, and optional features like steps, handrails, and edging trims.

Common Damage

1. Weathered & Discoloured Boards

  • Boards worn and faded from exposure

2. Rotting Timber

  • Rot identified in boards and/or subframe

3. Loose or Warped Boards

  • Creating unstable walking surface

4. Weak Substructure

  • Signs of movement, weakness, or poor support

5. Failed Fixings

  • Screws or nails corroded or failing

6. Algae & Moss

  • Surface build-up increasing slip risk

Repairs

minor Repairs

  • Cleaned and treated existing decking to improve durability
  • Applied protective treatment or sealant
  • Levelled uneven sections

moderate Repairs

  • Removed and replaced damaged decking boards
  • Replaced affected sections of subframe/joists
  • Installed new fixings and secured loose boards

major Repairs

  • Reinforced structure to improve strength and load support
  • Full subframe replacement
  • Complete deck replacement

New Installation

When Replacement Is Needed

  • Creating a new outdoor living space
  • Old decking beyond repair
  • Upgrading from timber to composite

Installation Steps

  1. Prepare Ground

    • Level ground area for new decking base
  2. Install Framework

    • Treated timber or composite joists
    • Correct spacing, support, and ventilation beneath
  3. Lay Decking Boards

    • Timber or composite to agreed layout
    • Hidden or surface fixings for secure finish
  4. Fit Edging & Steps

    • Edging trims, steps, or handrails if required
  5. Apply Treatment

    • Protective oil/stain for timber decking

Lifespan

Timber decking
10–15 years (with treatment)
Composite decking
20–30 years

Warning Signs

  • Boards feeling soft or spongy
  • Visible rot or decay
  • Boards wobbling underfoot
  • Green algae making surface slippery
  • Screws popping up

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