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TimberTech Composite Decking

Decking Tips & Advice

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Installing your own deck? Read our decking advice first!

When installing TimberTech decking, you should always keep the shallow groove (which appears on one edge of each board) consistently on the same side. As the fibres of the board are directional, this will ensure that the sun casts a consistent shadow, giving a uniform shade throughout.

Here are some more decking tips – direct from the experts here at TimberTech UK – to help make the job that little bit easier:
  • Use the CONCEALoc® bracket to fix the first and last board.
  • For the neatest possible finish, pre-drill 4mm pilot holes (do not countersink).
  • When face-fixing boards, drive each screw until the screw’s head is flush with the surface of the board. Do not over-drive.
  • TimberTech decking is easy to install with no special requirements. We recommend standard woodworking tools and standard pressure-treated softwood timbers for the sub frame. TimberTech deck boards can be drilled, nailed, sawn or routed, with no danger of rot.
  • Maximum span between joists is 400mm for residential decks.
  • We recommend a 3-4mm gap between boards (CONCEALoc® is designed to automatically create a 4mm gap between the boards).
  • To aid water run-off, the deck should slope 13mm for every 2.44m away from the house.


  • Available in 2 heights: 10mm or 38mm
  • Decide what height timber joists to use, paying attention to the height of any existing door thresholds. Pressure-treated 50mm wide softwood timber joists should be used. You can select the height of timber joists to suit your installation (generally between 50-100mm high).
  • Fit EasyFix shoes at gaps of 400mm down the length of the timber joists. We recommend 8 per m2 for joists at 400mm centres on residential decks.
  • Lay out the timber joists. When making a butt joint in joists, always leave a 15mm expansion gap and ensure that the joint is supported by a vertical post.
  • Fix a timber joist noggin at intervals of 1.2m.
  • Use EasyFix packers to assist with levelling the deck.

TimberTech RadianceRail

  • Check all components are included prior to assembly
  • If you need to cut RadianceRail components, cut slowly using a fine tooth saw blade to avoid chipping the surface. Be sure to cut down, not up, through the white/black coating.
  • We recommend additional reinforcement, which is included for handrails at the first floor and above. A steel reinforcement rod can be pushed through the void in the handrail profile and fixed into the vertical 95 x 95mm timber posts.
  • If you are constructing an elevated deck with its surface 600mm above ground level (and the deck is subject to building regulations), the handrail should be 1100mm above deck level. TimberTech supply a 3.6m baluster that can be cut into 4 equal 900mm lengths – this increases the height of the handrail to the required 1100mm.

For more composite decking tips, consult our Frequently Asked Questions page. Alternatively, click here to view our downloadable installation resources.

Don’t forget, we offer a full decking installation service for customers who don’t wish to handle the installation themselves!

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