Cladding

Weatherboard Cladding

Aluminium Weatherboard Cladding

Features

Overview

Aluminium weatherboard cladding is Knotwood's overlapping board profile, engineered to replicate the classic weatherboard look board for board. Each board laps over the one below it, casting the same shadow line a timber weatherboard casts, in a single 150mm width that matches the profile on most existing UK weatherboard houses closely enough for a re-clad to read as a refresh rather than a change of character.

Where It Fits

Built to Perform

Sizes & Options

Take a Closer Look

Horizontal Install

Each Weatherboard 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.

Starter

Trims

Corners

Profiles

Suite

Tab - Lock Weatherboard
150mm

KECT150W

Tab - Lock
Starter

KECTS

Cladding - Clip
45mm

KACC

Base Trim
(F)

KECFF

Cover Trim - Small
(M)

KECFMS

Cover Trim
(M)

KECFMM

Cover Trim - Large
(M)

KECFML

Base Joiner Trim
(F)

KECJF

Cover Joiner Trim
(M)

KECJM

Internal Corner Cover Trim - 25mm
(M)

KECCMS

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

Cover Corner Trim - 135º
45mm - (M)

KECCMA

Reveal Cover Trim
(M)

KECRM

Tab - Lock Weatherboard - 150mm

KECT150W

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PDF

DWG

Customisation

Downloads

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

Fasteners

304 or 316 grade stainless steel. Hot-dip galvanised acceptable in non-marine zones.

Warranty Life

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

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 aluminium weatherboard cladding?

Aluminium weatherboard cladding is an overlapping board system that reproduces the look of traditional timber weatherboarding in extruded aluminium. Knotwood’s version is a 150mm tab-lock board available in solid colours or a timber-grain finish. It gives the same stepped profile and shadow lines without painting, rot or replacement.

How does it compare to timber weatherboarding?

Visually they are close to identical. In service they are not. Timber weatherboarding needs repainting roughly every four to six years, and it rots at the laps and the bottom board where water sits. Aluminium weatherboards will not swell, rot or feed wood-boring beetle, and the finish is baked on rather than brushed on.

Can I use it on a weatherboard house renovation?

Yes. This is one of the strongest cases for it. The 150mm board reproduces the existing profile closely enough that a re-clad reads as a refresh rather than a change of character, which matters on a weatherboard house in a conservation area. It also lets you clad one elevation and leave the rest.

How does aluminium weatherboard cladding compare with composite and uPVC weatherboard cladding?

All three avoid the repainting cycle that timber needs, so the differences are material rather than maintenance. Aluminium is extruded rather than moulded, so the board holds a sharper profile edge and a more consistent lap line across a long run. It is also recyclable at end of life, where composite boards combine a polymer binder with wood flour and are harder to reprocess. Fixings, trims and corner details are the same aluminium system throughout rather than a separate accessory range.

Is aluminium weatherboard cladding non-combustible?

Knotwood’s weatherboard profile is classified A2-s1,d0 to BS EN 13501-1. Under Approved Document B, A2-s1,d0 is a material of limited combustibility rather than non-combustible, which is Class A1. The classification applies to the board as tested, finish included. For a specific building, and particularly for height-related requirements, confirm the classification report reference and the applicable provisions with our team and your fire engineer before specifying.

How is it installed?

Boards hook into a tab-lock starter and swing back onto the sub-structure, then a 45mm cladding clip fixes each board into the sub-frame.

Does it work in coastal and exposed locations?

Aluminium does not rot or rust the way timber and steel do, which makes it a sensible choice on the coast where weatherboarding is a common vernacular anyway. Stainless steel fasteners in 304 or 316 grade suit exposed conditions, and 316 is the grade specified where salt exposure is a factor.

Is this shiplap or weatherboard?

The two get used interchangeably in the UK but they aren’t quite the same thing. A traditional weatherboard is a tapered board that overlaps the one below, throwing water clear of the joint. Shiplap cladding uses a rebated joint so the boards sit flatter against each other, usually with a rounded groove along the top edge. Knotwood’s 150mm tab-lock board gives the lapped horizontal line most people are after from either, in aluminium rather than timber. If you’re matching an existing elevation, send us a photo and we’ll tell you how close the profile reads.

Can the boards be installed vertically?

Yes. Horizontal is the traditional orientation and the one most people picture, but vertical installation works with the same board and trims, and it changes how a building reads: horizontal emphasises width and settles a building down, vertical draws the eye up and suits a narrow frontage or a tall gable. The substructure changes with the orientation, since battens run perpendicular to the boards, so it needs deciding before the framing goes up.

What goes behind the boards?

Boards fix to a supporting framework rather than straight onto the wall, which creates the cavity a rainscreen build-up needs so water that gets past the face can drain and the wall behind can dry. The framework can be aluminium, steel or treated timber depending on the wall and the requirements of the building. Cavity depth, breather membrane and fixing centres are project-specific, so send us a section through the wall and we’ll confirm the detail.

How are corners and window reveals finished?

With trims matched to the profile and finish, so external corners, reveals and the base of the wall close out properly rather than showing a cut board end. Reveals are worth setting out early, because where the boards meet a window frame is one of the first things the eye lands on, and on a lapped profile the lines either align across the opening or they don’t. Send us the elevations and we’ll work the setout through before manufacture.

Can it go over existing timber weatherboarding?

Often, and it’s a common renovation route on a UK house where the boards have gone but the structure hasn’t. What decides it is the condition of what’s underneath: the existing boards and the wall behind need to be sound enough to carry the framework and the loads on it. Rot at the base course, which is where timber goes first, usually means stripping back rather than covering over. Send us photos and we’ll tell you what’s involved.

Do the boards expand and contract?

Aluminium moves with temperature more than timber does, which is why the fixing method is specified rather than left to site judgement. The system allows for that movement, so boards aren’t fixed rigidly at every point in a way that would cause buckling on a hot south-facing elevation. It matters more on long uninterrupted runs and on darker finishes, which run hotter in direct sun.

How long do the boards take to arrive?

Boards are manufactured to order rather than held in every finish, so lead time depends on the profile, the finish and the quantity. Standard powder coated colours and timber grain finishes run faster than a bespoke colour. Cladding usually sits between the roof going on and the scaffold coming down, so if the programme has fixed dates, talk to us early and we’ll confirm what’s achievable.

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Woodgrain Finishes

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Cladding

Weatherboard Cladding

Aluminium Weatherboard Cladding

Features

Take a Closer Look

Profiles

Customisation

Colouring

Orientation

Downloads

Specification

Product Details

Performance Requirements

FAQs

What is aluminium weatherboard cladding?

How does it compare to timber weatherboarding?

Can I use it on a weatherboard house renovation?

How does aluminium weatherboard cladding compare with composite and uPVC weatherboard cladding?

Is aluminium weatherboard cladding non-combustible?

How is it installed?

Does it work in coastal and exposed locations?

Is this shiplap or weatherboard?

Can the boards be installed vertically?

What goes behind the boards?

How are corners and window reveals finished?

Can it go over existing timber weatherboarding?

Do the boards expand and contract?

How long do the boards take to arrive?

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

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Free Estimations
& Support

Huge Range of
Woodgrain Finishes

Want some
samples?

Need more
technical info?