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Published: 17/12/25 By:

Timber-built lock gates are more than a legacy from the age when we shipped most of our produce by canal: they continue to offer a technically and aesthetically sound solution when correctly specified. On waterways, rivers and canals, the gate must resist constant water pressure, impact from boats, wet/dry cycles and often partial submersion. For these uses, timber offers inherent resilience, a natural look which complements the historic environment, and (when suitably sourced and maintained) a long service life.

What you need from your timber species

Selecting timber for lock gates means matching material properties to demanding exposure.

  • Use Class 5 suitability (permanent contact with water or soil) so that the timber is engineered for submersion or damp-contact environments.
  • High natural durability against decay, fungi and wood-boring organisms which can live in freshwater or tidal environments.
  • Structural strength and dimensional stability given the load from water pressure, debris, boat impact and decades of service.
  • Sourcing and certification to ensure that material is responsibly harvested and traceable. 

When these factors are addressed, timber lock gates can deliver many years of effective service.

Key species for lock gate timber

Here are some of the timber species most suited to lock gate construction and refurbishment:

Ekki

Ekki is a tropical hardwood which stands out for its exceptional density, durability and resistance to wet conditions, making it a top tier option for lock gates.

Greenheart

Another tropical hardwood frequently specified for hydraulic and marine applications. Its natural durability in water-exposed conditions, ability to resist swelling/warping and suitability for high load make it highly desirable for lock gate builds.

Oak (Green or European)

Oak continues to be a trusted choice for heritage, freshwater lock gates or refurbishments, particularly where traditional appearance and availability are important. As a British/European species, oak offers obvious benefits in sourcing and familiarity. However, oak’s natural resistance does not match the top tropical hardwoods for full submersion use, so its specification must reflect that (less tidal/sea exposure or additional protection).

Best practices for specification, installation and maintenance

To ensure a lock gate built of timber performs to expectation, the following practices are vital:

  • Site-condition survey and design: Accurate measurement of the lock chamber, wall angles, water levels and boat traffic impact is the first step. Good design ensures the timber is sized correctly and fitted with appropriate fixings.
  • Dimensioning and machining: Dense hardwoods such as Ekki or Greenheart may require specialist tooling. Boards and beams must be square, machined to tolerance, and with joints (mortise/tenon or steel-reinforced) designed for hydraulic load. 
  • Protection and finish: Even naturally durable species benefit from appropriate coatings, sealants or rub treatments at contact points, fixings or wear zones. 
  • Installation details: Ensure proper drainage behind the gate leaves (where relevant), correct alignment of mitres, secure balancer beams and robust fixings or bearings.
  • Regular inspection and maintenance: Even the best timber will degrade if neglected. Plan for routine checking of joints, fasteners, swelling, wear from boats or debris, and make localised repairs to prevent the need for full replacement.
  • Appropriate species to exposure match: Choose inherently resilient species for the highest exposure sites (tidal canals, boat traffic, full submersion). In calmer freshwater settings, species with slightly lower durability may perform well if correctly specified.

The case-for timber

While steel, concrete and composite gates are available, timber holds distinct advantages in many canal infrastructures:

  • Aesthetics & heritage compatibility: Timber offers a traditional appearance which complements historic waterways.
  • Workability & repairability: Timber components can often be replaced or repaired more easily than extensive steel fabrication.
  • Sustainability credentials: When sourced from certified forests (FSC, PEFC) and maintained correctly, timber lock gates support circular economy and renewable resource goals.

Selecting timber for lock gates is much more than choosing “the nicest wood”. It is about assessing species durability, structural strength, exposure conditions and expected lifecycle. For the highest durability, tropical hardwoods such as Ekki and Greenheart set the benchmark in Use Class 5. For freshwater or heritage settings, responsibly sourced oak remains a valid contender.

Combine the correct material with robust design, precise manufacture, installation and planned maintenance, and a timber lock gate becomes a strong and secure long-term asset for your canal infrastructure.

Ready to specify timber which stands up to the toughest conditions?

Reach out to EcoChoice, the UK-based specialists in FSC/PEFC certified timber solutions for demanding civil, marine and heritage applications including lock gates, piers and canals. With their long expertise in high-durability species such as Ekki and Greenheart, plus full support on specification, machining and logistics, EcoChoice are uniquely placed to help you get it right from structural performance to compliance and longevity.

Make the smart choice for your next lock-gate or water-borne infrastructure project:

  • Call 0345 638 1340 or email sales@ecochoice.co.uk to start a conversation. (Ecochoice)
    • Ask about suitability for Use Class 5 environments, bespoke machining and lead-times for your site.
    • Request samples, specification sheets or a project briefing to get your design moving.

Do not settle for a generic solution. Choose timber which is engineered, certified and backed by experience.

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Why timber is the best material for lock gates

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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 Ekki, Greenheart, Opepe 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 (bridges, piling, etc) we usually supply Cumaru, Ipe, Jatoba, and Balau. And for the lighter exterior use where the timber is non-structural such as cladding, we deliver Cedar, Larch, Thermowood 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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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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