Special-surface decorative clay wall bricks should be specified through a complete geometric definition. Face relief, orientation, repeat, colour, thickness, rear profile, edges and manufacturing tolerances all affect appearance, installation and evidence; a photograph and two plan dimensions are not enough.
Close the missing-thickness information gap
Do not carry “60 × 242 mm” into a specification as if it were complete. Request a current product code and revision-controlled drawing with length, height, actual and nominal thickness, tolerance, unit mass, rear profile, edges and available corner or special pieces.
Thickness affects the installed plane, support or bonding, joint depth, corner returns, interfaces, mass and compatibility with evidence. Confirm whether thickness varies across the relief and identify the reference points used to measure it. Tie every sample, report and quotation to the completed drawing.
If more than one thickness or backing option exists, assign separate codes and compare them explicitly. Do not let a finish name conceal a different body. Record maximum and minimum overall depth so adjacent construction and setting-out allow for the true product envelope.
Translate the surface idea into geometry
Describe what makes the surface special: grooves, ridges, pits, waves, projections, carving, random relief or another controlled form. Define depth, spacing, orientation, edge termination and permitted variation where design-critical. A poetic texture name can accompany the drawing but cannot replace it.
Ask whether faces are intentionally unique, selected from a repeat set or produced with continuous variation. Establish how distinctive marks, high points and flat areas should be distributed. Retain labelled current samples that show the centre and limits of the approved geometry and colour range.
Where a family contains several moulds or texture codes, photograph and label each approved face. State the intended proportions or mixing rule and identify prohibited combinations. This makes the design reproducible without pretending that intentionally varied units must be identical.
Design orientation, repeat and transitions
Orientation
Mark any preferred top, bottom or direction on elevations and packing information so units are not rotated unintentionally.
Repeat
Study the elevation at scale and set mixing rules that prevent obvious clusters or unintended repeated motifs.
Edges
Decide how texture terminates at joints, cuts, corners, openings and adjacent materials without awkward partial features.
Light
Review close, oblique and distant views under representative daylight and artificial lighting because relief changes with angle.
Use enlarged drawings and full-size samples to coordinate texture with the unit module and joint grid. If several surface types share an elevation, assign each one a code and distribution rule rather than depending on an installer’s memory.
Set measurable manufacturing tolerances
Define how length, height, thickness, squareness, warpage, edge condition and relief are checked, including datum points and measuring method. Separate functional tolerances from intentional surface variation. The inspection plan should state sampling frequency, acceptance, retained references and response to nonconformance.
Hold a preproduction review using the approved drawing and samples. Agree whether tooling, clay blend, forming, firing or finishing changes require resubmittal. A “handmade look” or “special surface” label should not become permission for uncontrolled geometry that compromises joints or the installed plane.
Inspect early production before the full order is complete. Compare measurements, surface distribution and colour against the approved package and retain reference units from the accepted run. Define how out-of-range pieces are isolated, recorded and replaced rather than blended into deliveries.
Coordinate the complete wall system
Identify whether the current unit uses a bonded, mechanical or other installation route. Coordinate substrate, preparation, support or adhesion, joints, movement, corners, openings, flashings, drainage paths, sealants and replacement access. Use current instructions for the exact unit and system.
Map water from copings, sills, roofs, ledges and adjacent materials. Projecting texture can influence wetting and dirt collection but does not act as a complete water-control strategy. Show where water is collected, directed and discharged through the designed wall layers.
Resolve clearances at windows, flashings, frames, trims, corners and movement joints using the maximum product depth, not an assumed average. Check construction sequence and replacement access. A special projection should not obstruct drainage, seals or the engagement required by the approved support system.
Match evidence and mock-up to the geometry
Create a matrix for dimensions, absorption, strength, freeze–thaw, chemical exposure, reaction to fire and other relevant product criteria, plus assembly support, adhesion or fixings and water management. Check that reports identify the tested thickness and surface, not a smoother or thinner relative.
Build a representative wall area with the intended substrate and system, surface mix, orientation, joints, corner, opening edge, flashing, sealant and cleaning sequence. Review shadows, lippage, cuts, residue and replacement. A visual mock-up does not replace required technical evidence.
Release a traceable texture package
Before production, align code, complete drawing, approved geometry and colour ranges, mixing rules, evidence, quantities, specials, spares, quality plan, packing and programme. Record product and batch labels so delivered pallets can be reconciled with inspections and installed locations.
Review the current terracotta brick range and relevant project references for initial design context only. At handover, retain as-built details, control samples, inspection and cleaning guidance, repair principles and labelled spares.
Store approved samples and spares so projecting faces are not chipped or abraded. Keep their labels connected to batch and installed locations. Future replacement is more reliable when the complete geometry, orientation and mixing rule remain available with the physical units.