A successful custom terracotta component starts with a disciplined brief, not an unlimited promise about colour, shape or size. The design team needs to connect architectural intent with a feasible forming route, fired behaviour, support strategy, approvals and programme. This guide turns an early facade idea into information a manufacturer can evaluate and prototype.
Define the design problem before the object
State where the terracotta will be used: ventilated cladding, a louver or baguette, a screen, a wall lining, a corner or a local feature. Identify whether it is exterior or interior, accessible to occupants, exposed to impact, repeated across a large elevation or limited to a few signature locations. Give the project location and applicable code route; a shape cannot be assessed without its environment and duty.
Then describe the visual purpose in plain language. Is the component meant to cast shade, produce a deep shadow, wrap a corner, carry relief artwork or establish a fine horizontal rhythm? Add elevations, sections, reference images and normal viewing distances. A clear purpose lets the fabricator suggest adjustments without erasing what matters.
Separate requirements from preferences
Mark each input as fixed, preferred or open for development. That simple hierarchy prevents the team from spending time perfecting a profile that cannot move while overlooking a joint or finish that could solve a production problem.
| Brief topic | Information to provide | Decision to obtain |
|---|---|---|
| Geometry | Face dimensions, depth, curvature, returns, relief, holes, cut-outs and orientation | Forming route, feasible section, tolerances and unit families |
| Appearance | Colour intent, gloss, texture scale, directional grain and acceptable variation | Clay or glaze route and fired approval range |
| Interfaces | Joints, corners, openings, support zones, flashings, adjacent materials and access | Coordinated edges, clearances, fixings and replacement sequence |
| Performance | Loads, exposure, fire, impact, moisture, durability and other project criteria | Applicable evidence, tests and responsibilities for the complete assembly |
| Delivery | Quantities, coding, packaging, installation sequence, spares and site constraints | Production batches, inspection points and logistics plan |
Choose a manufacturable concept
Different forms suit different production methods. A long unit with a constant cross-section may suggest extrusion; deeper sculptural relief or changing geometry may call for a moulded or pressed approach. Cutting or secondary machining can create local features, but it may also affect exposed edges and tolerances. These are starting questions, not guarantees of capability.
Ask the proposed manufacturer to mark the section with material thicknesses, internal webs, radii, support zones, firing orientation and no-go areas for drilling or cutting. Confirm maximum and minimum dimensions for the exact profile, not for a broad product family. Simplifying one concealed return or rationalising mirrored pieces can reduce unique tooling while preserving the visible design.
Prototype in four deliberate stages
Digital review
Exchange dimensioned drawings or models, identify tolerances and interfaces, and resolve how the shape repeats at corners and openings.
Material trial
Use small fired samples to compare colour, texture, gloss and relief depth. Label the recipe, finish and firing reference for every option.
Full-size unit
Produce the proposed section at real scale. Measure it, inspect edges and surfaces, and test the intended clip, bracket or attachment zone.
Assembly mock-up
Combine several units with real joints, supports, corners, membranes and adjacent materials. Review appearance, installation sequence and replacement.
Retain the accepted samples and mock-up as quality references. Record precisely what approval means: visual range, dimensions, workmanship and interfaces. Approval of one attractive unit should not silently waive project tolerances or required evidence.
Develop the support and joints at the same time
Custom terracotta is one part of a wall or screen assembly. Coordinate dead load, wind and other actions through the units, clips, rails, brackets and supporting structure with the responsible engineer. Allow for production and construction tolerances, movement, drainage and installation access. Do not assume a ventilated cavity automatically provides waterproofing, pressure equalisation, insulation or energy savings; those outcomes depend on the designed and tested assembly.
Model the difficult zones first: base and head, window jambs, parapets, inside and outside corners, transitions to standard panels and locations where installers cannot reach behind the unit. A component that looks elegant in isolation may need a different edge to remain replaceable and safely restrained.
Require evidence tied to the proposed product
List the project’s acceptance criteria and ask which current reports apply to the exact clay body, finish, dimensions and support route. Depending on use and jurisdiction, the review may cover dimensional tolerance, water absorption, strength, frost exposure, fire behaviour, impact, anchors, corrosion compatibility or other system tests. The project team should confirm the applicable standards; an unrelated test on a different profile is not automatic evidence.
Handle environmental claims the same way. Request a current, scoped environmental product declaration or other recognised project evidence where required. Natural raw material alone does not quantify embodied impacts, service life or whole-building performance. The broad “highest standards,” energy-saving and limitless-customisation language on the 2015 page is therefore not carried forward as fact.
Freeze the design and control production
At design freeze, issue approved drawings, unit codes, orientation, colour and texture limits, control samples, test requirements, packing sequence and inspection plan. Define how nonconforming pieces are handled and how many matching spares are retained. For a large facade, consider a first-production review before releasing every batch.
Explore terracotta rainscreen panels and terracotta baguettes and louvers, then compare applications in the project gallery.