Cladding

Castellated Cladding

Aluminium Castellated Cladding

Features

Overview

Castellated is Knotwood's boldest profiled cladding board, a ridged three-dimensional profile fixed with a secure tab-lock system for a seamless finish. Each board carries a repeating pattern of ridges that throws strong shadow lines across the wall, giving a facade real texture and architectural presence rather than a flat, uniform surface.

Where It Fits

Built to Perform

Sizes & Options

Take a Closer Look

Horizontal Install

Each 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

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

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

Country of Origin

Australia
Manufactured in Australia and supplied to the UK market.

Length

6500mm

Finish

Traditional solid powder coated colours or a sublimated timber grain surface

Availability

Lead times can vary between 2–4 weeks, depending on the time of year. Contact us for an accurate estimate.
Made to Order - 8-20 weeks.

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

Certified A2-s1,d0 to BS EN 13501-1

Testing Design Standards

CWCT Standards

Performance Standards

BS EN 755 Aluminium Alloy Extrusions.

BS EN 12206 Powder Organic Coatings.

FAQs

What is castellated aluminium cladding?

Castellated is a profiled cladding board in extruded aluminium, shaped so the face steps in and out rather than sitting flat. Profiled cladding is the trade term for any board with a three-dimensional face, and castellated is the squared, notched version of it. Knotwood’s is a 150mm tab-lock board available in solid colours or a timber grain finish.

How is castellated cladding different from Knotwood's other cladding profiles?

Shadow Line, V Line and Weatherboards all sit close to flat, with the detail in the joint between boards. Castellated puts the detail in the board itself, so the texture is much stronger and reads from further away.

Where does castellated cladding work best?

On elevations meant to be noticed. It carries large commercial facades and apartment schemes well because the shadow pattern gives scale to a big flat area. It also works as a feature section against a flatter profile like Shadow Line elsewhere on the same building, using identical fixings underneath.

Is castellated cladding the same as corrugated cladding?

No. Corrugated cladding is a wavy, ridged sheet, usually rolled from thin metal and associated with agricultural and industrial buildings. Castellated is a notched, squared profiled cladding board with defined flat faces between each ridge, extruded rather than rolled, which is what gives it a harder shadow line and a more architectural read. The two get confused because both add texture to a wall, but they are different products at different ends of the market.

How is castellated cladding installed?

Boards hook into a tab-lock starter and swing back onto the sub-structure, then a concealed cladding clip fixes each board into the sub-frame. Every board locks into the one before it, so no fixings show on the finished face. Boards run horizontally or vertically using the same components.

Does castellated cladding need repainting or sealing?

No. The finish is baked onto the aluminium rather than applied on site, so there is no repainting cycle and no annual sealing.

How does it compare to timber or composite 3D cladding?

The look is achievable in all three. The difference is what happens over time. Timber battens and composite boards move, cup and need refinishing, and the sharp edges that create the shadow line are the first thing to weather. An extruded aluminium profile holds the same edge, and the same shadow, for the life of the finish.

What is the reaction to fire classification of castellated cladding?

Castellated boards are extruded aluminium, classified A2-s1,d0 to BS EN 13501-1. Under Approved Document B, A2-s1,d0 is a material of limited combustibility, which is the classification required for external wall construction on relevant buildings under Regulation 7(2). Because compliance is assessed on the whole external wall build-up rather than the cladding alone, send us the building height and the wall construction and we will provide the classification report reference for your specification.

Can castellated cladding run vertically as well as horizontally?

Yes, and it changes the effect more than it does on a flat board. Run horizontally, the ridges throw shadow that shifts through the day as the sun moves across the elevation. Run vertically, the shadow stays more constant and the wall reads taller. The substructure changes with the orientation since battens run perpendicular to the boards, so the direction needs deciding before the framing goes up.

How deep is the profile?

The ridge depth is what separates castellated cladding from a flat board, and it’s what creates the shadow. On a south-facing elevation in strong sun the pattern reads hard and graphic; on a north-facing wall in flat UK light it’s subtler and reads more as texture than as line. Worth thinking about which elevation it’s going on, because the same board looks like two different products depending on the light it gets.

Does the profile collect dirt or water?

Yes, and it’s how the profile is most often used. Castellated cladding on a feature elevation or an entrance, with Shadow Line or V Line running across the rest, gives a building a hierarchy without introducing a second material. All Knotwood cladding profiles share the same finish range, so the boards match exactly even where the profiles don’t.

What are the trims and corners like on a profiled board?

More considered than on a flat board, because a ridged profile meeting a corner or a window reveal has to resolve the pattern as well as close the edge. Trims are matched to the profile and finish, and the setout matters: where the ridges land relative to an opening is the difference between a facade that looks designed and one that looks cut to fit. Send us the elevations and we’ll work it through before manufacture.

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Features

Take a Closer Look

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Specification

Product Details

Performance Requirements

FAQs

What is castellated aluminium cladding?

How is castellated cladding different from Knotwood's other cladding profiles?

Where does castellated cladding work best?

Is castellated cladding the same as corrugated cladding?

How is castellated cladding installed?

Does castellated cladding need repainting or sealing?

How does it compare to timber or composite 3D cladding?

What is the reaction to fire classification of castellated cladding?

Can castellated cladding run vertically as well as horizontally?

How deep is the profile?

Does the profile collect dirt or water?

What are the trims and corners like on a profiled board?

Why Knotwood?

Free Estimations & Support

Huge Range of Woodgrain Finishes

CPDs & Educational Support

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Need More Help?

Want some samples?

Speak with a Knotwood Expert

Need more technical info?

More Cladding Solutions

Shadow Line

V Line

Weatherboards

Castellated

Fixed Gap

Free Estimations
& Support

Huge Range of
Woodgrain Finishes

Want some
samples?

Need more
technical info?