Cladding

Castellated

Castellated
Aluminium Cladding

Features

Overview

Castellated aluminium cladding, also known as fluted cladding, is a profile shaped into a repeating rhythm of ridges and recesses that casts strong shadow lines across a facade. Knotwood’s Castellated Board is a one-piece extruded aluminium board that delivers that depth without the weight, combustibility or maintenance of timber. Available in a 150mm board, it suits feature walls, entry statements and full elevations across our aluminium cladding range.

Where It Fits

Built to Perform

Sizes & Options

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Horizontial Install

Castellated board hooks onto a tab-lock starter at the base and swings flush against the substructure, secured with a concealed cladding clip. Installation works from the bottom up, one board locking into the next, finishing with a cover trim pressed over the base trim to close the perimeter.

Vertical Install

Starter

Trims

Corners

Inspiration

Maison - Sans Souci

Maison in Sans Souci, Sydney, takes a sculptural approach to contemporary duplex living. Designed by Dezcon, the project pairs strong geometric forms with softer curves to create two distinct homes within a cohesive architectural statement.

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Profiles

Suite

Castellated Tab - Lock Board
150mm

KECT150C

Tab - Lock
Starter

KECTS

Cladding - Clip
45mm

KACC

Base Trim
(F)

KECFF

Cover Trim
(M)

KECFMM

Base Joiner Trim
(F)

KECJF

Cover Joiner Trim
(M)

KECJM

Reversible Corner Base Trim
(M)

KECCML

Base Corner Trim
135º (F)

KECCFA

Reversible Corner Cover Trim - Rounded
(F)

KECCF

Reversible Corner Cover Trim - Square
(F)

KECCF-02

Standard Profile - Top Hat
90 x 25mm

KECT9025

Castellated Tab - Lock Board - 150mm

KECT150C

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Specification

Product Details:

Material

6063 T6 Temper Extruded Aluminium Alloy

Country of Origin

Australia

Length

6500mm

Finish

Traditional Solid Powder Coated Colours or Sublimated Timber Grain

Availability

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

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

Soft broom, water, 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

FAQs

What is castellated aluminium cladding?

Castellated cladding is an aluminium cladding profile shaped to create a repeating pattern of ridges and recesses across the facade surface, producing strong shadow lines and a bold textured look. Knotwood’s Castellated Boards give a building genuine architectural presence: the shaped profile catches light and casts changing shadows as the sun moves across the elevation, giving the facade visual movement and depth.

Is the Knotwood Castellated Tab-Lock Board the same as castellated or fluted cladding?

Yes. Castellated and fluted describe the same profile shape, a repeating pattern of ridges and recesses cut into the board face. The terms are used interchangeably across the industry, with architects and specifiers more often saying fluted and manufacturers more often saying castellated. Knotwood’s Castellated Tab-Lock Board is our version of that profile, in extruded aluminium with a concealed tab-lock fixing.

How does castellated aluminium cladding differ from other profiles?

Castellated Boards are the most texturally bold of Knotwood’s close-fitted cladding profiles. Where Shadow Line adds a subtle reveal and V Line adds a single groove line, castellated boards create a full surface pattern of ridges that reads clearly at street level. The profile generates stronger shadow definition than any of the flatter Knotwood cladding options, making it the right choice when the brief explicitly calls for a facade that makes a statement.

What effect does castellated aluminium cladding have on a facade?

The repeating ridges in a castellated board create a shifting pattern of light and shadow across the building face as the sun moves through the day. This gives the facade visual movement without changing its material, colour or finish. Architects use this effect deliberately: a castellated section breaks down a large wall plane and adds interest without introducing a new material or finish system, which keeps the design language of the building coherent.

What is castellated aluminium cladding suited to?

Castellated cladding suits projects that want a facade to function as an architectural feature: commercial buildings where street presence matters, residential builds where the facade design is a deliberate statement, or any project that pairs a bold textured section against a flatter cladding profile to give a large wall plane definition. It also works well on feature facade panels where the textured section acts as a visual counterpoint to simpler adjacent surfaces.

Is castellated aluminium cladding non-combustible?

Yes. Knotwood aluminium cladding profiles, including Castellated Boards, are non-combustible and tested to AS 1530.1 and AS/NZS 1530.3 for combustibility and early fire hazard properties. Group Numbers are what the National Construction Code uses to set where a lining material can be used. For projects with formal compliance requirements, send us your building class and we will confirm the documentation for your project.

What warranty does Knotwood castellated cladding come with?

Knotwood castellated cladding 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, the ultra-durable coating used on prestigious commercial and high-rise projects. All warranties must be registered to take effect. Full terms and the registration form are on our warranty page.

How much does castellated aluminium cladding cost?

Knotwood does not publish fixed pricing, because cladding is quoted on specification. The main variables are the finish, the total area and the trims the detail requires. Castellated Boards use a tab-lock starter plus base, cover and corner trims, and those matter to the final figure as much as the boards do. Send us your elevations and we will quote it.

What are the dimensions of Knotwood castellated boards?

Castellated Boards come in a single 150mm board size, supplied in 6500mm lengths. Boards install with a tab lock fixing system, forming a one-piece dimensional profile with no visible fasteners on the finished face.

What finishes are available for Knotwood castellated cladding?

Castellated Boards are available in traditional solid powder coated colours and in a sublimated timber grain surface, the same architectural-grade finish range used across the Knotwood cladding system. That means a castellated feature section can be specified alongside Shadow Line or any other Knotwood profile on the same facade with a consistent finish. The full range is on our finishes page.

Can castellated aluminium cladding be used with other Knotwood profiles?

Yes. Castellated Boards are commonly used as a feature section alongside flatter Knotwood cladding profiles on the same building. Because all Knotwood cladding shares the same aluminium construction, concealed fixing system and finish range, profiles can be combined across a single facade without sourcing from different suppliers. A castellated feature panel alongside a Shadow Line or Fixed Gap Board run is a typical pairing on commercial and residential projects.

Can castellated aluminium cladding be installed over an existing wall?

In many cases, yes. Because the system fixes to a substructure rather than directly to the wall, castellated aluminium cladding can often be installed over an existing facade without stripping it back, which suits recladding and commercial refurbishment. What matters is whether the existing structure is sound and able to carry the substructure and the cladding, and whether the wall is straight enough for the substructure to be packed true. That last point matters more with a castellated profile than a flat one, because the shadow lines make any deviation in the plane more visible. Have the existing wall assessed before you order.

What maintenance does castellated aluminium cladding need?

Very little. There is no painting, sanding or resealing cycle at any point. Periodic washing with a soft broom, water and a pH neutral detergent is all that is required, and more often on coastal installations to clear salt deposits before they sit on the finish. The one thing worth noting with a castellated profile is that the recesses collect more dust and debris than a flat board, particularly on a sheltered elevation, so a soft brush through the ridges is worth including in the wash. Avoid abrasive pads and solvent-based cleaners, since those can permanently mark the powder coat finish.

Why Knotwood?

Locally Made.
Reliable Service

Free Estimations
& Support

Extensive Range of
Wood Grain Finishes

CPDs & Educational Support

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Specification

Product Details:

Performance Requirements:

FAQs

What is castellated aluminium cladding?

Is the Knotwood Castellated Tab-Lock Board the same as castellated or fluted cladding?

How does castellated aluminium cladding differ from other profiles?

What effect does castellated aluminium cladding have on a facade?

What is castellated aluminium cladding suited to?

Is castellated aluminium cladding non-combustible?

What warranty does Knotwood castellated cladding come with?

How much does castellated aluminium cladding cost?

What are the dimensions of Knotwood castellated boards?

What finishes are available for Knotwood castellated cladding?

Can castellated aluminium cladding be used with other Knotwood profiles?

Can castellated aluminium cladding be installed over an existing wall?

What maintenance does castellated aluminium cladding need?

Why Knotwood?

Locally Made. Reliable Service

Free Estimations & Support

Extensive Range of Wood Grain Finishes

CPDs & Educational Support

More on Cladding

Cladding Profiles Compared

Trusted, Tested, Compliant - Knotwoods CodeMark Certification

Is All Aluminium the Same?

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Speak with a Knotwood Expert

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More Cladding Solutions

Shadow Line

V Line

Weatherboards

Castellated

Fixed Gap

Castellated
Aluminium Cladding

Locally Made.
Reliable Service

Free Estimations
& Support

Extensive Range of
Wood Grain Finishes

Want some
samples?

Speak with a
Knotwood Expert

Need more
technical info?