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Whether you are building a raised deck or you are inspired by these ground-level deck ideas, there are some installation must-dos which cannot be skipped, especially if the system is destined for public use. Find out in this quick guide why gaps in timber decking matter, how wide they should be, and installation tips to achieve the best possible finish in your public space.

The Importance of Decking Gaps

Public decking areas have to withstand a lot of wear and tear. High traffic and footfall will influence deck design, while accessibility considerations are likely to dictate your timber choice and finish. The gaps in timber decking have the same importance, particularly when it comes to the safety of your public deck, boardwalk or communal walkway.

With the correct gap sizes, water can run off the deck quickly and easily to prevent slips and reduce the risk of accidents. Everyday debris, such as leaves and grit, also has the chance to escape through appropriately sized gaps. Tripping hazards are minimised too. Timber decking expands when wet and without gaps to expand into, boards will buckle and lift.

Drainage and Decking Board Gaps

For public decks based outdoors, rain, humidity and water runoff are key considerations. Gaps prevent the pooling which causes slip hazards. The presence of standing water can significantly shorten the deck’s lifespan with the wood becoming increasingly saturated and prone to decay, rot and fungal growth.

Gaps effectively make decks self-draining, minimising maintenance and improving performance in the short and long term.

Recommended Decking Board Gaps

When installing timber decking, there are two gaps to consider – the side gap and the end-to-end gap. The side gap refers to the spacing between each board, while the end-to-end gap is the spacing between the board ends. A standard side gap should be approximately 5mm. End-to-end gaps should be between 3 and 5mm for most hardwoods and 3 to 6mm for the majority of softwoods.

How Gap Sizes Vary Between Timber Types

The gap sizes for your public decking project may vary based on the type of timber selected. The density, grain, stability and shrinkage value of the timber will influence the side gap size. Here are the recommended spacings for the most common decking timbers:

  • Softwoods: Pine, Spruce and Cedar boards are generally installed with 5 to 6mm side gaps.
  • Hardwoods: More stable, denser Iroko, Jatoba and Balau shrink less but still expand when wet making a gap of 4 to 6mm more suitable.
  • Thermally modified woods: These have much greater stability and can be installed with smaller gaps.
  • Composite decking: A gap of 5 to 8mm is advised.

The width of decking boards may also make a slightly larger gap necessary. Boards measuring more than 90mm wide require a 7 to 8mm gap.

Best Practices for Public Deck Installation

There is an art to installing decking with accurate and consistent spacing. Firstly, note the condition of the boards and your surroundings. Whether wet or dry, you must account for the timber’s moisture content during installation and leave appropriate gaps accordingly. Pre-finishing the boards with oil or sealant before installation is recommended.

We advise the use of spacers or a hidden-fixing system to prevent uneven gaps and encourage good air flow.

Source Timber Decking Boards at EcoChoice

For safe, user-friendly public walkways and decking areas, our timber boards offer reliable solutions. Start your timber decking order today.

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Unsure which timer is best for your project?

Our timber experts have years of experience and will be able to match the perfect species to your project, as well as provide a quote for sustainable timber at highly competitive prices.

Frequently asked questions

Do you supply timber for domestic uses?

Yes, we supply timber for domestic applications as well as commercial and public constructions. From garden decking to shed cladding, we will be happy to supply smaller deliveries for home use.

Is your timber FSC-certified?

Yes, all timber we supply is FSC or PEFC certified and sourced from independently verified responsibly managed forests. If we can’t find your request in FSC/PEFC certified timber we’ll suggest an alternative that is certified or clearly note that the offer is minimum EUTR.

Where does EcoChoice deliver to?

EcoChoice delivers to construction sites, warehouses and homes across the UK, as long as there’s access and unloading for our trucks.

What are the best timber species for exterior use?

There are many different timber species suitable for exterior use and which is the best for your project depends on your requirements. In general, though, we recommend EkkiGreenheartOpepe and Oak for heavier civil/marine uses. For intermediary external use such as decking, where the timber needs to be both strong and durable but not on the same level as civil engineering (bridgespiling, etc) we usually supply CumaruIpe, Jatoba, and Balau. And for the lighter exterior use where the timber is non-structural such as cladding, we deliver CedarLarchThermowood and others.

Which timber is the most durable?

Durability Class 1 timbers are the most durable. This of course depends on the use (hazard) class they’ll be in service for. For direct ground and water contact such as sleepers, fenders, marine piling, etc, Ekki and Greenheart are known to be the most durable timbers available. For decking and cladding where there’s no direct ground contact (use class 3) there’s a much wider range of timbers such Larch, Cedar, Thermo modified Pine or Ash and others.

What’s the best timber for internal cladding?

Internal cladding, where your timber is not in ground and not exposed to the elements can be classed as either use-class 1 or 2 – in which case most timbers will meet this durability criteria. That is not to say they’ll be the best, since internal environments have lower humidity (moisture) levels than outside. So in these cases, it’s best to go for a kiln-dried timber cladding board as these are more stable and delivered already in lower MC (moisture content) than the usual fresh sawn timbers sent to external applications. A word of caution – as timber reacts to variations in moisture, it’s best to avoid cladding any areas inside your bathroom.

How can I make decking less slippery?

The first thing is to ensure your deck boards are kept clean from leaves and other debris which will, over time, cover the surface and make it more slippery. Grooved boards can be used to improve grip if installed and used perpendicular to traffic, so especially useful in narrow passages and footbridges. Lastly, you can add our Grip-Choice strips: these are a mix of epoxy with aggregates that add gripping ridges to your deck area. Gripchoice is an easy way to make decking less slippery and safer, especially over large areas or where there’s high traffic. We can pre-install Grip-Choice strips for your decking before delivery or ship the strips separately to add to your existing deck’s grooves as a retro-fit solution.

What wood machining services do you offer?

We can offer planing, sawing, drilling and profiling of rough-sawn wood to any profile you require: from handrails to large port fenders.

Can you supply pre-drilled timber?

Yes, we will be happy to provide pre-drilled timber which is tailored to your needs for quick installation, thus saving you valuable time on site.

What cladding profiles do you supply?

We provide a wide range of cladding profiles, including tongue and groove, featheredge and shiplap. You can check the standard profiles here – but we can also match or custom make profiles to suit your specific needs.

Does timber change colour?

Yes, timber is well-known for changing colour over time. Some species can darken quickly right after installation, and like most untreated wood will eventually weather to a beautiful silver-grey. Interior timber is less likely to change colour (depending on conditions), and timber can be stained, painted or treated with UV-resistant oils to reduce colour change.

Do I need to treat exterior timber?

Some timbers such as Oak and Ekki, can withstand the strains of exterior use without any treatment. However, to extend the lifespan and maintain the aesthetic of your wood, we do recommend treating your timber with stains and oils. Pre-treated timber, such as ThermoWood and OrganoWood, are low-maintenance options which are more durable, but can have their life service extended by applying a clean and stain maintenance schedule.

Do I need to treat interior timber?

Depends on what area the timber is being used. For floor joists and timber rafters, it is common to see timber treated, or least very well kiln-dried. Other uses such as flooring may benefit from varnishing while internal timber cladding for decorative purposes shouldn’t require any treatment other than if you want to change its colour with different types of stains or oils.

Where are you based?

We’re based in Cambridge, UK, and coordinate multiple sawmills all over the world to manufacture your order. We then organise delivery with a range of hauliers so that your orders gets to your site on time.

What are the usual decking sizes?

Timber decking is usually 21x140mm or similar. For heavier applications where there’s more load and traffic, we deliver 35 or 45mm thick boards (such as Hastings Pier). Narrower boards are also possible: 95-90mm is a standard width – but we can manufacture whatever size you require.

What are the usual cladding sizes?

Typical cladding section sizes are 18×95 and 18x145mm although we can always custom make a section to suit your project’s design requirements. That includes waney edge boards in Oak or Chestnut as well as extra wide 195mm boards.

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Good quality, great service, fast delivery!

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Marinella Li

Always helpful! One of our valued TDCA DeckMark and CladMark accredited supplier members which means their quality procedures are routinely audited and stand up to scrutiny giving you extra peace of mind.

5

Janet Sycamore

Having needed the supply of cladding, decking boards and other specified timbers through out the year Eco choice have been very helpful in sourcing the specified timbers and quantities required at a very competitive price.

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Great quality, service and price. A pleasure to deal with. I would highly recommend Eco Choice.

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Fantastic company- Mike and the team are the best in the business- worked with them for many years.

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Always reliable and quality products, easy to deal with company.

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Average rating on Google Reviews

  • 3 years ago

Always helpful! One of our valued TDCA DeckMark and CladMark accredited supplier members which means their quality procedures are routinely audited and stand up to scrutiny giving you extra peace of mind.

Janet Sycamore

  • 9 years ago

Excellent service and outstanding product

Cindy Dicks

  • 1 month ago

Good quality, great service, fast delivery!

Marinella Li

  • 9 years ago

Great service, quality products and very easy to deal with. Thank you.

Malcolm Coury

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