Envelope and protection · Exterior Cladding
Terracotta Rainscreen Cladding
Explains terracotta rainscreen as fired clay hung on rails, why its colour is inherent rather than applied, and how the open-jointed rainscreen principle it is built around differs from a sealed facade.
Educational reference entry. Suitability depends on the complete assembly, substrate, exposure, installation method, manufacturer documentation, local requirements and qualified professional review.
Overview
What terracotta rainscreen is
Terracotta rainscreen elements are extruded from prepared clay, dried and then fired in a kiln, in much the same family of processes that produces facing brick and clay roof tiles. The extrusion is usually hollow, with internal webs, which keeps the element manageable while giving it a deep face. Some products are left as natural fired clay, others carry a glaze or a slip applied before firing.
The colour is the clay body and the firing, not a coating. That is the single most useful thing to understand about the material: there is no paint film to chalk, flake or need renewing, and a chip exposes the same colour beneath. What it does mean is that shade varies between batches and even within a firing, so elements are normally sorted and dry-laid before fixing so that variation is distributed rather than concentrated.
The system is named for how it works. Elements clip or hook onto horizontal rails carried on brackets, and the joints between them are deliberately left open. Water passes through those joints and is dealt with by the drained and ventilated cavity, the membrane and the detailing behind, while the clay face takes the wind and the majority of the rain. Because each element is independently clipped, a single damaged unit can often be released and replaced without disturbing its neighbours, which is unusual among cladding systems.
Terminology
Common names and aliases
These names describe the same thing. The library keeps one entry per material so that an acronym, a trade name or a regional spelling never becomes a second, thinner page.
- Terracotta cladding
- Clay rainscreen
- Terracotta baguettes
- Fired clay facade panels
Applications
Common applications
Where this material is typically encountered. A typical application is not a statement that it suits your project.
- Full rainscreen elevations where a fired clay surface is wanted with the crisp joint pattern of a hung system.
- Banding and feature zones combined with brickwork, using a related clay material at a different scale.
- Vertical or horizontal baguette screens used in front of glazing to give shading and rhythm.
- Entrance bays, reveals and recessed elevations where a deep, textured face is wanted at close range.
- Refurbishment overcladding on a new support system where a durable, colour-stable face is required.
Consideration
Where it is commonly considered
- Where colour that is inherent to the material rather than applied to it is important to the design.
- Where an open-jointed rainscreen approach has been adopted for the wall as a whole, not just the finish.
- Where the support system, brackets and rails have been designed alongside the cladding rather than after it.
- Where variation of shade across an elevation is welcomed as a characteristic of a fired material.
- Where the ability to replace individual units later is a meaningful consideration.
Professional review
Where additional professional review is especially important
These are the situations where the answer depends on the specific building, and where a qualified professional should be involved before anything is decided.
- Where the cavity behind cannot be drained and ventilated, since the open joints assume that it can be.
- Where the background structure has not been assessed for the brackets and rails the system requires.
- On buildings where local requirements for the external wall have not been confirmed with the relevant authority.
- In positions with regular hard impact, since fired clay chips and breaks rather than deforming.
- Where a completely uniform colour is expected across a large elevation.
Properties
Key properties to discuss
Qualitative topics worth raising. Measured values, classes and grades come from the manufacturer's technical documentation for the specific product, not from a reference page.
- Appearance
- Colour comes from the clay and the firing, so it runs through the element. Batch and kiln variation produce a natural range, which is why sorting and dry-laying before fixing is part of the normal process rather than a refinement.
- Weathering and exposure
- Fired clay does not carry a coating that can chalk or peel, so weathering tends to show as surface soiling and organic growth in the patterns that water and shade create rather than as loss of finish.
- Moisture behaviour
- Joints are open by design, so water reaches the cavity as a matter of course. The membrane, the cavity drainage and the detailing behind the elements are doing the weather management, not the clay face.
- Surface wear
- Fired clay is hard but brittle. Edges and corners are the vulnerable points during handling and in service, and a chip cannot be filled invisibly the way a coated board can be touched in.
- Fire-related questions
- Fire is a property of the complete wall build-up, including the support system, any insulation and the cavity detailing, rather than of the facing alone. Requirements vary by building type, height and location and have changed in several countries, so they must be confirmed with a qualified professional and the relevant authority.
- Repairability
- Individual elements are clipped rather than bonded, so replacing one unit is often possible without dismantling an area, provided a matching unit from a comparable firing can still be obtained.
- Installation dependency
- The rails and brackets are set out first and the elements follow, which means the accuracy of the support system determines whether joints look consistent across the elevation.
Exposure
Exposure and environmental conditions
- How rain runs down the elevation, since soiling patterns follow water paths across open-jointed facades.
- Whether the elevation faces prevailing wind-driven rain, which affects how much water enters the cavity.
- Whether freezing conditions coincide with saturation, a general consideration for any fired clay product.
- How shaded the elevation is, which influences drying and the likelihood of organic growth in joints.
- Whether the location exposes the face to airborne salts, deposits or heavy traffic soiling.
Assembly
Substrate and system dependencies
What this material sits on, is fixed to or depends on. This is usually where performance is won or lost.
- The bracket and rail arrangement, which is what actually carries the cladding back to the structure.
- Whether the cavity is drained and ventilated continuously, since the open joints depend on it entirely.
- How the breather membrane is fixed and lapped, given that it is partly visible through open joints.
- Whether the background can take the bracket fixings across the whole elevation, including at openings.
- How reveals, cills and heads are formed, since the depth of the system changes the geometry at openings.
Appearance
Appearance and finish considerations
- Whether natural fired clay or a glazed surface is intended, as these age and reflect light quite differently.
- How shade variation is to be distributed, which is decided by sorting rather than by ordering.
- How the joint pattern relates to openings and floor levels across the elevation.
- Whether the membrane visible through open joints is acceptable in colour and appearance.
- How the profile depth of the extrusion reads in raking light, since this is a strongly modelled material.
Durability
Durability questions
Questions to raise rather than a service life to expect. No material has a universal lifespan — it depends on the assembly, the exposure and the upkeep.
- How the particular clay body has behaved in comparable exposure according to the manufacturer's information.
- How vulnerable edges and corners are protected during handling and at accessible levels.
- Whether the rails, brackets and clips are compatible with each other and with the background.
- How the fixings and clips behave under wind loading, which is a matter for a qualified professional.
- What happens where the cladding meets the ground, a roof or another material.
Upkeep
Maintenance and repair considerations
- How the elevation will be inspected and cleaned once access equipment has been removed.
- Whether spare elements from the same firing are being retained for future replacement.
- How a broken element in the middle of an elevation would be released and replaced.
- How the cavity and its drainage will be checked for obstruction over time.
- What cleaning methods are appropriate for a fired clay or glazed surface.
Installation
Installation dependencies
What the installation depends on — not how to do it. Method belongs to the manufacturer's instructions and the trades carrying out the work.
- Setting out the rails and brackets accurately, since every joint line follows from them.
- Sorting and dry-laying elements so that colour variation is spread across the elevation.
- Careful handling, because chipped edges caused during installation stay visible afterwards.
- Sequencing with membrane and insulation, which must be complete before the rails are loaded.
- Coordination with window installation so that reveals and flashings are formed in the right order.
Documentation
Documentation to request
Ask for these in writing, for the specific product being proposed, and keep them with the project record.
- Manufacturer's literature for the specific extrusion profile and surface finish being supplied.
- The support system manufacturer's information covering brackets, rails and clips as a set.
- Drawn details for openings, corners, the base of the wall and the roof edge.
- Guidance on handling, storage and acceptable colour variation between batches.
- Cleaning and inspection guidance appropriate to fired clay or glazed surfaces.
Conversations
Questions for qualified professionals
Bring these to the relevant qualified professional, manufacturer or authority. Requirements vary by project and location.
- How is the cavity behind the open joints drained and ventilated across the whole elevation?
- What holds the elements to the building, and has that support system been designed by a qualified professional?
- What are the current local requirements for this type of external wall, and who is confirming them?
- How will shade variation between batches be sorted and distributed before fixing?
- Is the membrane visible through the joints acceptable in appearance as well as in performance?
- How would a single broken element be replaced once the elevation is complete?
- How do the openings, reveals and base of wall details work with the depth of this system?
- Are the brackets, rails, clips and fixings compatible with each other and with the background?
Blind spots
Commonly overlooked points
- The open joints are the design, not a shortcoming, which puts the cavity and membrane at the centre of the wall.
- The membrane is visible through the joints, so its colour and neatness become an appearance issue.
- Colour variation is inherent to firing, and controlling it happens by sorting rather than by specification.
- Edges chip during handling, and damage caused before fixing is often only noticed once the elevation is up.
- Joint consistency across a large elevation is inherited from the accuracy of the rails behind it.
What this page does not do
- This reference describes the system in general terms and does not specify, assess or approve any product for any building.
- External wall build-ups are subject to local requirements that differ by building type, height and location and that have changed over time; they must be confirmed with the relevant authority.
- Fire performance concerns the entire wall build-up and is a matter for a qualified professional, the relevant authority and the manufacturer's documentation.
- Bracket, rail and fixing design is an engineering matter and is not addressed here.
Related entries
Related materials
Materials from the same family, an adjacent role in the assembly, or a shared application.
Inspiration
Related Ideas Library pages
Design directions where this material commonly appears.
Preparation
Related planning checklists
Owner-side preparation before the conversation where this material comes up.
Go deeper
Related Build Design Hub guides
Planning guidance and neutral comparisons behind the decisions on this page.
Exterior Cladding & Render
Reference entries for external wall finishes — fibre cement, timber and composite cladding, vinyl siding, metal and laminate panels, terracotta rainscreens and the render families.
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