Cladding

Castellated Boards

Q: What warranty does Knotwood offer on Castellated Boards?

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

Aluminum Castellated Cladding Boards

Features

Overview

Castellated Boards bring a striking one-piece profile to Knotwood's cladding range, with a stepped cross-section that creates a strong horizontal shadow pattern across the facade. The three-dimensional profile casts deeper shadows than flatter profiles like Classic Boards or V Line Boards, giving the facade bold, dimensional texture and visual movement as the sun moves across the elevation.

Where It Fits

Built to Perform

Sizes & Options

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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
6"

KECT150C

Tab - Lock
Starter

KECTS

Cladding - Clip
1 3/4"

KACC

Base Trim
(F)

KECFF

Cover Trim
(M)

KECFMM

Base Joiner Trim
(F)

KECJF

Cover Joiner Trim
(M)

KECJM

Base Corner Trim - 135º
1 3/4" - (F)

KECCFA

Reversible Corner Cover Trim - Rounded
(F)

KECCF

Reversible Corner Cover Trim - Square
(F)

KECCF-02

Reversible Corner Base Trim
(M)

KECCML

Castellated Tab - Lock Board - 6"

KECT150C

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Customization

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Specification

Product Details

Material

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

Country of Origin

United States of America. USA sourced and produced from local supply chains, adds to our quality and minimizes disruption with logistics and manufacturing delays.

Length

18.6'

Finish

Traditional Solid Powder Coated Colors or a Sublimated Wood Grain Surface

Availability

Lead times can vary between 2 to 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

Periodic washing with a soft broom and water while also engaging a pH-neutral detergent

Sustainability

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

FAQs

What is castellated cladding?

Castellated cladding is an aluminum 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.

How does castellated cladding differ from other cladding profiles?

Castellated Boards are the most texturally bold of Knotwood’s close-fitted cladding profiles. Where Classic Boards adds a subtle or flush 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 calls for a facade that makes a statement.

What is castellated 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 as a visual counterpoint to simpler adjacent surfaces.

What effect does castellated 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, color 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, keeping the design language of the building coherent.

Can castellated cladding be used with other Knotwood profiles?

Yes. Castellated Boards are commonly used as a feature section alongside flatter Knotwood aluminum siding profiles on the same building. Because all Knotwood cladding shares the same aluminum 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 Classic Boards run is a typical pairing on commercial and residential projects.

What size is Castellated Boards available in, and how is it installed?

Castellated Boards come in a single 6 inch size, supplied in standard 18 foot 6 inch lengths. It uses a tab-lock fixing system: each board hooks onto a Tab-Lock Starter (KECTS) at the base and swings flush against the substructure, secured with a concealed Cladding Clip (KACC). Installation works from the bottom up, with Base Trim (F) and Cover Trim (M) closing the perimeter and Reversible Corner Trims finishing internal and external corners. Unlike Weatherboards, Castellated Boards can also be installed vertically using the same system in a left-to-right sequence.

What finishes are available for Knotwood castellated cladding?

Castellated Boards are available in traditional solid powder coated colors or a sublimated wood grain surface. Because the stepped profile throws its own shadow across every ridge, a mid-tone finish reads considerably darker in the recesses than it does on a flat board, which is worth seeing on a sample before committing. The current U.S. range is set out on our finishes page.

Is castellated aluminum cladding non-combustible?

Aluminum is non-combustible under ASTM E136, so the board does not contribute fuel to a fire. Compliance is never assessed on the cladding alone, though. The complete wall system, including framing, weather barrier, insulation, fasteners and cavity protection, has to be tested or assessed as a code-compliant assembly under the applicable I-Code as adopted by your jurisdiction. Send us the applicable code and the wall build-up and our team will confirm what test evidence is available for this profile.

What warranty does Knotwood offer on Castellated Boards?

Covered by the rewrite above, but note the page treats the product name as singular in places and plural in others. “Castellated Boards come in a single 6 inch size” is plural, “Castellated Boards carries” is singular. Worth one pass for consistency; plural reads better throughout.

What material are Castellated Boards made from?

Castellated Boards are made from 6063 T6 temper extruded aluminum alloy, sourced and produced in the United States.

Why Knotwood?

Locally Made,
Reliable Service

Free Estimations
& Support

Extensive Range of
Wood Grain Finishes

Lunch & Learns
& Educational Support

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Specification

Product Details

FAQs

What is castellated cladding?

How does castellated cladding differ from other cladding profiles?

What is castellated cladding suited to?

What effect does castellated cladding have on a facade?

Can castellated cladding be used with other Knotwood profiles?

What size is Castellated Boards available in, and how is it installed?

What finishes are available for Knotwood castellated cladding?

Is castellated aluminum cladding non-combustible?

What warranty does Knotwood offer on Castellated Boards?

What material are Castellated Boards made from?

Why Knotwood?

Locally Made, Reliable Service

Free Estimations & Support

Extensive Range of Wood Grain Finishes

Lunch & Learns & Educational Support

More on Cladding

Why Aluminum Is Becoming The Preferred Choice for Cladding

Architect-Ready Aluminum Systems with Certified Performance

Crafted Locally, Showcased Globally

Need More Help?

Want some samples?

Speak with a Knotwood Expert

Need more technical info?

More Cladding Solutions

Classic Boards

V Line Boards

Weatherboards