Unglazed describes a declared surface state; it does not automatically mean untreated, through-coloured, weatherproof, low-maintenance or environmentally preferable. Confirm whether the exposed face has no fired glaze and whether any slip, engobe, wash, stain, sealer, impregnation or site-applied treatment is present.
The eight archive photographs show one unidentified interior whose pale narrow rectangular units appear on floors, counters and a stair-side wall. They do not identify a current product, full brick versus tile/slip, rear geometry, exact surface treatment, installation system, project team or LOPO role. This guide turns that visual reference into an exact-product finish, batch, exposure and maintenance brief.
- Archive date
- June 2022 article record, not a product or project date
- Visual sequence
- Eight photographs of one unidentified interior
- Visible units
- Pale pink and cream narrow rectangular pieces in several interior zones
- Featured
- Attachment 9593 is also the first body image
- Unverified
- Project, product type, surface route, dimensions, system and supplier
- Current status
- Availability, sample range and evidence require confirmation
Describe five product surfaces separately
Exposed face
Declare the forming and finish route, colour/texture range, sheen, directional marks, pores, permitted marks and whether any post-firing or site treatment is present.
Body and cut core
Confirm material/body identity, colour through the section, chambers or solid form, cut appearance and whether face-to-core differences are intended.
Factory edges
Approve colour, texture, arris, dimensional variation and the edge visibility at joints, corners, steps, shelves or returns.
Back or bonding face
Record rear profile, keying, dimensional tolerances, dust/treatment and compatibility requirements for the selected support or bonding route.
Joints and setting materials
Coordinate grout/mortar/adhesive colour, width/depth, staining risk, cleanup limits, movement joints and interfaces as part of the finished appearance.
Applied treatment
If a sealer, impregnation or coating is proposed, declare its product, coverage, finish change, vapour/water behaviour, compatibility, renewal and cleaning implications.
“Natural” or “original texture” is a visual brief, not a technical classification. A sample schedule should use the supplier’s current language and identify every surface process. Do not assume that unglazed means raw, unsealed, uniform, full-body colour or the absence of all additives and treatments.
Approve a colour and texture range, not one sample
Fired-clay appearance can vary, but the source and acceptable limits must be defined for the exact item. Request labelled boundary samples representing the lightest/darkest and least/most textured acceptable units, including edges and cuts. Review multiple production lots where the project risk warrants it; record which lots each sample represents.
Build a representative area with the proposed joint and substrate/background. Set rules for pack/pallet mixing, directional orientation, concentrated colour patches, unacceptable marks, chips, bow, dimensional variation and substitutions. Inspect under agreed daylight and artificial light, dry and—where relevant—temporarily wet, because moisture can change apparent colour without proving permanent staining or performance.
Identify the unit and use
Link the item, plant, full/thin identity, dimensions, tolerances, body, face, edges, back and intended wall/floor/interior/exterior zone to controlled documents.
Approve boundary samples
Keep labelled limits for face/edge/core colour, texture, sheen, pores, marks, chips, bow and any applied treatment.
Build an assembly mock-up
Use actual substrate/support, setting materials, joints, cuts, corners, edges, transitions and cleaning process at representative scale.
Trial likely contaminants
Where appropriate, test construction residue, water/minerals, food/oil or project-relevant soiling and the least aggressive approved removal method.
Control lots and installation
Record samples, batches, pallets, mixing rules, locations, inspections, rejected units, substitutions and retained spares.
Retain the maintenance baseline
Photograph approved dry/wet appearance, document treatments and cleaning trials, and define triggers for investigation, repair or replacement.
Separate efflorescence, residue and ordinary soiling
A pale deposit is not automatically efflorescence. First distinguish soluble-salt crystallisation from lime deposits, grout or mortar haze, construction dust, hard-water marks, sealant migration, food/oil, atmospheric dirt or biological growth. Record when and where it appeared, wetting/drying history, water and salt sources, adjacent materials, drainage and cleaning attempts.
Efflorescence requires a moisture-and-salt pathway; treating only the visible deposit may leave the cause. Review substrate, mortar/grout/adhesive, joints, backing layers, drainage, rising or penetrating moisture and adjacent materials. Use the separate efflorescence diagnosis guide for a conservative investigation sequence.
Approve cleaning through a controlled trial on retained samples and the mock-up. Start with the least aggressive manufacturer-approved method and inspect after drying for colour/texture change, residue, surface loss, edge attack and joint effects. Do not assume acid, alkali, solvent, abrasive, pressure washing or a sealer is universally safe. A treatment that darkens or enriches colour is a design change and must be recorded.
Match evidence to exposure and system route
| Use or exposure | Project questions | Evidence boundary |
|---|---|---|
| Interior wall | Substrate/support, joints, movement, edges, impact, cleaning, indoor emissions where required and replacement access. | Exact unit and installed assembly; “unglazed” alone proves none of these outcomes. |
| Interior floor or step | Traffic, slip under expected conditions, wear, point/rolling loads, edges, setting bed, joints, moisture and maintenance. | Floor/paving classification and representative assembly evidence; do not transfer a wall-tile result. |
| Wet or service area | Waterproofing/drainage, standing water, contaminants, stains, cleaning chemicals, sealers, joints and transitions. | Exact exposure and compatibility trials; face appearance is not water or hygiene approval. |
| Exterior wall | Wetting/drying, freeze-thaw where relevant, salts/pollution, colour/weathering, support/adhesion, drainage, movement and falling-object risk. | Current product/system reports and project design; no universal weatherability or low-maintenance claim. |
| Exterior horizontal | Traffic, slip, wear, pooling, frost/salts, bedding/drainage, movement, cleaning and replacement. | Exact paving-use product and assembly evidence; a facade or interior image cannot approve it. |
| Environmental claim | Manufacturer/plant/product, declared unit, life-cycle modules, data period, verification, transport, service/maintenance and end-of-life assumptions. | Current scoped declaration or project-accepted study; unglazed/natural appearance is not proof. |
- current product code, manufacturer/plant, intended use, forming/firing and surface-treatment declaration;
- face, edge, back and cut-section drawings or samples, dimensions, tolerances, mass and packaging/batch identity;
- project-relevant dimensional, absorption, strength, freeze-thaw, slip/wear, stain/chemical, colour/weathering and cleaning evidence as applicable;
- substrate/support or setting system, joints, movement, drainage/waterproofing, interfaces, fire/structural/safety scope and responsible design;
- boundary samples, mock-ups, installation/cleanup trials, inspection criteria, batch traceability and spare/replacement strategy; and
- environmental or health documents only when their exact product, plant, scope, method, issue date and validity can be checked.
This page does not publish a current SKU, dimension, absorption value, test threshold, adhesive, mortar/grout, sealer, cleaning recipe, service life or environmental result. Project documents must establish whether the proposed unit and complete system suit the intended wall, floor, wet, exterior or traffic condition.
Turn an unglazed appearance into a controlled finish brief
Share the intended use and exposure, exact product family, face/body/edge intent, colour/texture range, substrate/system route, joints, contaminants, cleaning/maintenance plan, applicable standards, quantity and programme. Request current samples, drawings and evidence tied to the quoted item.