Crackle glaze is a controlled visual finish only when its approved appearance, product body and project evidence are clearly defined.
A green crackle/crazed-glaze network can reference celadon and add fine-scale variation to a facade, but it must not be confused with a crack through the ceramic body, a damaged edge, an installation fracture or movement in the support. This guide connects finish samples and batch control with edges, cleaning, exposure evidence and complete-system responsibility.
What the 2020 archive can—and cannot—establish
The old page names “Sichuan Songci Museum”; a separate April 2020 LOPO project record identifies the application more precisely as the Museum of Song Porcelain in District D of the Song Porcelain Culture Center, Suining, Sichuan. The photographs show the completed green/celadon-colour envelope, layered wave-like bands and a close crackle-glaze reference.
| Finish description | Green/celadon crackle glaze on a wave/corrugated terracotta face; retain as historical project description |
|---|---|
| Item/model number | Not recorded in the WXR, live post, captions or readable image content; do not invent one |
| Size | This post says 500 × 800 mm; the later LOPO record instead describes eight custom widths from 300 to 750 mm and seventeen heights. Neither is a current standard range without schedule confirmation. |
| Facade quantity | The same old body first says 20,000 m² and later 2,000 m²; the later LOPO record says nearly 6,000 m². No controlling area is republished. |
| Geometry/system | The later supplier record describes custom wave panels on curved building geometry and a vertical support concept. These are dated project statements, not a universal detail. |
| Current selection | Confirm current sample code, clay body, glaze, profile, full dimensions/tolerances, weight, edge/back geometry, batch plan, support route and applicable evidence |
Define crackle glaze separately from structural cracking
Use precise project language. An intentional crackle or crazed-glaze finish is an approved visual network associated with the glaze surface and represented by accepted samples. A ceramic-body crack, chipped support zone, fractured corner, displaced unit or line that changes after installation is a different condition and must not be accepted merely because the finish is called “cracked.”
Approved visual network
Compare density, line width, continuity, contrast and distribution against the signed master and agreed range. Record which face/return areas are intended to carry glaze.
Edge or body damage
Quarantine pieces with cracks through the body, support/back profile, drilled/cut zone or edge unless the responsible technical parties assess and formally disposition them.
Post-installation change
Map new lines, displacement, chips, staining or joint change; record date/location/exposure and investigate product, handling, support, movement, impact and moisture rather than assuming decoration.
Build an approval range, not one perfect sample
Glazed architectural ceramics should be selected through a hierarchy of physical references. Start with a design-intent sample, then review a full unit with actual wave/relief, edges and back geometry. Establish signed range samples showing acceptable light/dark colour, gloss, crackle density/contrast, surface character and permitted variation. Confirm representative production-batch samples and a facade mock-up under project lighting and viewing distances.
Record sample code, date, batch/lot, firing or production reference where supplied, dimensions, orientation and approval status. Photograph samples for tracking but keep the physical masters; screen calibration and image compression can change green hue, crackle contrast and sheen.
Coordinate batches, orientation and field mapping
Define how approved variation is distributed over elevations. Random mixing, deliberate gradients and zone-specific batches create different results. Issue package-to-elevation and unit maps, keep batch labels through storage/installation, dry-lay representative groups where practical and set hold points before large areas are fixed. Keep agreed attic/spare stock labelled by batch and unit code for future replacement.
For wave or curved modules, record orientation, handedness, relief phase, lap/overlap where applicable, starting datums, special returns and boundary pieces. Check how glaze appears on top/bottom edges and at cut or exposed returns. A small colour chip does not reveal alignment, shadow bands, joint network or accumulated tolerance.
Resolve cutting, edges and penetrations before release
Confirm whether each unit is moulded/extruded to final geometry, factory cut or permitted to be site cut. Cutting can expose a different body colour, alter the visual crackle termination, create chipping or affect the back/support zone. Define permitted tools, support during cutting, minimum residual geometry, edge finish and inspection through current manufacturer instructions and project engineering—never by copying a photograph.
Schedule factory specials for corners, returns, soffits, openings, bases, parapets and penetrations where needed. Coordinate joint widths, movement zones, flashings, drainage, sealants and adjacent metals/membranes. Do not apply an unapproved sealer, paint or field glaze to hide an edge or crack.
Ask for exposure and system evidence explicitly
Water absorption and moisture
Review current product results under the specified, applicable method and specimen condition. A glazed face does not by itself define absorption through the body, edges, back or cut zones, and it does not prove wall-system water control.
Freeze-thaw and weathering
Where exposure requires it, confirm project-relevant test method, conditioning, cycles/criteria, exact body/glaze/profile and edge configuration. Do not infer resistance from colour, firing language or a completed-project photograph.
Glaze and surface behaviour
Define required evidence for glaze adhesion/integrity, staining, chemical/cleaning resistance, colour/gloss change or other exposure relevant to the project. Confirm whether intentional crazing changes the selected test interpretation.
Structure, support and movement
Trace self-weight, wind, seismic and applicable impact/maintenance actions through each unit, retention, rail/bracket, anchor and substrate. Coordinate relief eccentricity, tolerances, deflection, drift and thermal/moisture movement.
Fire and enclosure
Verify complete-assembly fire strategy, cavity barriers/fire stopping, insulation, membranes, openings and interfaces under applicable rules. Product finish data cannot approve an altered wall build-up.
Traceable configuration
Match reports/calculations to the proposed item, body, glaze, dimensions, thickness/profile, orientation, support and production status. Record deviations and obtain responsible-party acceptance before release.
Trial cleaning and plan long-term inspection
Identify likely dust, runoff, salts, biological growth, sealant residue, oils and construction contamination. Test the least aggressive proposed method on an approved spare or inconspicuous mock-up: water quality, temperature, cleaner concentration/pH, dwell time, brush/pad, pressure, rinse and drying can all affect appearance. Obtain current manufacturer acceptance and project approval before facade-wide use; avoid assuming an abrasive, acid, solvent, coating or pressure-washing regime is safe.
- approved master/range and production-batch samples with codes, dates and photographs;
- current product, finish, dimension/tolerance, edge/back and support documentation;
- configuration-matched calculations, tests, approvals and mock-up records;
- as-built unit/batch maps, concealed-work inspections and nonconformance dispositions;
- approved cleaning trial, routine method, prohibited methods and stain-response pathway;
- inspection triggers distinguishing finish variation from chips, body cracks, displacement or joint movement; and
- labelled spare units stored in suitable conditions with replacement instructions.
Review current system context on Terracotta Rainscreen and built visual references in the Architectural Terracotta Gallery. Finish approval never replaces complete-system engineering, testing, installation QA or code review.
Request a traceable crackle-glaze review
Share the project location/use, exposure, elevations, target colour/crackle/relief, unit geometry and quantities, edges/cuts, substrate and support route, applicable performance criteria, sample/mock-up plan, cleaning expectations and programme. Current feasibility and evidence must be confirmed for the proposed configuration.