Decking

Interlocking Planks

Interlocking Decking Planks

Features

Overview

Interlocking decking planks lock into each other along their edges rather than being screwed through the face, so the finished deck shows no visible fasteners. Knotwood’s aluminium interlocking planks clip plank to plank over the substructure, giving a continuous surface that installs faster than a screwed deck and has nothing on the walking surface to corrode or work loose.

Where It Fits

Built to Perform

Sizes & Options

Take a Closer Look

Interlocking Install

The Starter fixes along the first edge, then the first plank slides into it so its edge is held down and its clip fixes it to the support surface. Each following plank slides into the one before it, locking the join down as it clips into place, repeated row by row until the deck area is complete.

Slip Resistant Wood Grain

Inspiration

Church St

A minimalistic blend of mid century modernism and Palm Springs influence, this residence is attuned to light, views and landscape. Knotwood defines gates, screens, cladding, garage door, decking and fencing in Obsidian and White Ash, with charcoal decking underscoring a cool, timeless rhythm of restraint.

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Profiles

Suite

Interlocking Plank
150mm

KED150

Interlocking
Starter

KEDS

Plank Trim - Finisher (Hidden)
50 x 50mm

KEDAH

Infill
20mm

KEIS

Base Trim
(F)

KECFF

Cover Trim - Large
(M)

KECFML

Plank Clip
Interlocking Board

KADC

Interlocking Plank - 150mm

KED150

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DWG

Customisation

Stairs

Designed to integrate seamlessly with decking stairways and landings, providing consistent lines and safe, stylish edge protection.

Pattern

Combine Interlocking Planks with T-Clip Planks to add character to your design.

Concealed

Enjoy a flawless finish with hidden fixings that enhance the clean lines and premium look of your installation.

Downloads

Specification

Product Details

Material

Tempered Extruded Aluminium Alloy.
*See individual profile specification sheets for exact alloy and temper.

Country of Origin

Australia

Australian resourced and manufactured with local supply chains, to minimise possible disruptions or delays.

Length

6500mm

Availability

Lead times can vary between 2–4 weeks, depending on the time of year. Contact us for an accurate estimate.

Finish

Sublimated Wood Grain Slip Resistant Coating with a Powder Coat Base.

Warranty Life

Backed by a standard 15 year warranty and up to 25 years on selected finishes.
See our warranty page for the terms.

Maintenance

Periodic washing with a soft broom and water, using a pH neutral detergent.

Sustainability

Recyclable Aluminium
Non-Chromate Pre-Treatment
VOC free Powder Coat

Performance Requirements

Fire Standards

AS 1530.1-1994 - Combustibility testing for materials.

AS/NZS 1530.3-1999 - Methods of fire testing on materials.

AS 3959 (BAL40) - Building construction in bushfire prone areas.

Performance Standards

AS/NZS 1866 - Aluminium alloy extrusions.

AS 3715-2002 - Metal Finishing Surface Coating.

AS 4586 - Slip resistance classification, P5 rating.

Sustainability

Recyclable Aluminium.

Non-Chromate Pre-Treatment.

VOC free Powder Coat.

Structural Design Standards.

AS/NZS 1170.1-2002 - Structural design actions, permanent, imposed and other actions.

AS/NZS 1664.1-1997 - Aluminium structures.

FAQs

What are interlocking decking planks?

Interlocking decking planks are a decking system where each aluminium plank locks into the next, building a continuous deck surface without exposed fasteners on top. The fixing is concealed within the interlocking joint, so the finished deck has a clean, uninterrupted face. Knotwood’s interlocking planks are made from extruded aluminium and are available in architectural-grade finishes including timber look options.

How does an interlocking decking system differ from a standard screwed deck?

A standard screwed deck has visible fasteners driven through the face of each board. An interlocking system hides the fixing entirely inside the joint between planks, so there are no exposed screws on the surface. That removes visual disruption to the finish and eliminates the corrosion risk around surface fixings that comes with years of outdoor exposure in Australian conditions.

Where can interlocking decking planks be used?

Interlocking aluminium decking planks suit residential decks, alfresco and entertaining areas, and renovation projects replacing an ageing timber deck. The concealed-fix system is a strong choice wherever a fastener-free surface finish is the design priority. The aluminium construction also makes the system appropriate for coastal environments where salt air would accelerate the deterioration of a timber or steel deck.

Can interlocking aluminium decking planks be used around a pool?

Aluminium decking is commonly used around pools because it does not absorb moisture and will not swell, warp or rot when exposed to water, pool chemicals or high humidity. The wood grain surface is rated P5 under AS 4586, the highest slip resistance classification in the pendulum test. Two things to confirm for a pool surround: the slip rating your project requires for that wet area, and the surface temperature in full sun, since any decking material heats up underfoot. Send us your project details and we will confirm the right profile and finish.

Are aluminium interlocking decking planks non-slip?

Yes. The wood grain surface is a slip resistant finish, rated P5 under AS 4586, which is the highest classification in the pendulum test. That rating applies to the surface as supplied. How a deck performs in use also depends on the fall, the drainage and how the surface is maintained, so keep it clear of leaf litter, debris and algae, particularly in shaded areas where moisture sits for longer after rain.

Are aluminium interlocking decking planks non-combustible?

Yes, and they are suitable for bushfire-prone areas up to BAL-40. Knotwood aluminium is not deemed combustible when tested to AS 1530.1, and the decking achieves a Spread of Flame Index of 0 and a Smoke Developed Index of 2 when tested to AS/NZS 1530.3. CSIRO has assessed Knotwood interlocking decking as suitable where AS 3959-2018 requires non-combustible decking across BAL 12.5, BAL 19, BAL 29 and BAL 40, under Clauses 5.7.2.4(a), 6.7.2.4(a), 7.7.2.4(a) and 8.7.2.4(a). Timber and composite decking cannot meet the non-combustible requirement at the higher BAL levels.

What warranty do Knotwood interlocking decking planks come with?

Knotwood decking carries a powder coat warranty to AS 3715, and the term depends on the finish you specify. Woodgrain finishes use Interpon D STF and carry up to 15 years. Standard colours carry 10 years on Interpon D1000, or 25 years on Interpon D2525. All warranties must be registered to take effect. Full terms and the registration form are on our warranty page.

How much does aluminium decking cost?

Knotwood does not publish fixed pricing, because decking is quoted on specification. The main variables are the finish, the deck area, the substructure and the trims the detail requires. Interlocking planks are quoted with the starter, joiners and end trims as part of the system rather than the boards alone. Send us your plans and we will quote it.

What finishes are available on Knotwood interlocking decking planks?

Interlocking Planks are available in solid powder coated colours and in timber-look aluminium finishes, with a wood grain surface over a powder coated base. That is the same architectural-grade finish range used across the Knotwood decking range, so a deck can be matched to screens or cladding on the same project. The full range is on our finishes page.

How do I install Knotwood interlocking decking planks?

A Starter profile fixes along the first edge, then the first plank slides into it so its edge is held down and a Plank Clip fixes it to the support surface. Each following plank slides into the one before it, locking the join down as it clips into place, repeated row by row until the deck area is complete. Cladding Trim or a hidden Plank Trim finishes the perimeter, depending on whether the edge is exposed or sits against an adjoining wall or structure. Planks are 150mm wide and supplied in 6500mm lengths, installed on a supporting structure at continuous 450mm centres. The full installation guide is in our resources section.

What maintenance do aluminium interlocking decking planks require?

Aluminium decking planks require very little maintenance compared to timber. There is no sanding, oiling, repainting or retreating involved. A periodic wash-down to remove dirt, grime and salt residue is typically all that is needed to keep the surface and finish in good condition. The aluminium construction means there is no risk of the planks cupping, swelling, splitting or rotting over time.

Why Knotwood?

Locally Made.
Reliable Service

Free Estimations
& Support

Extensive Range of
Wood Grain Finishes

CPDs & Educational Support

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