A grey clay floor brick can support a restrained paving palette, but colour and the word “fireproof” do not define technical suitability. The exact unit, fire question, traffic, moisture, slip criteria, floor build-up and current evidence must be resolved for the project and jurisdiction.
Separate grey appearance from performance
Specify the visual intent in measurable project terms: target tone, permitted warm or cool variation, surface texture, edge character, joint colour and the lighting in which approval occurs. Fired clay can vary among samples and production batches. “Grey” is therefore a palette brief, not an exact digital colour value and not proof of any physical property.
Request several current samples and identify their product and batch references. Review them dry and, where the installation will be wet or treated, under representative conditions. Record whether sealers, cleaners or joint residues change the appearance. Keep signed control samples that show both the centre and acceptable limits of the approved range.
Ask the correct fire question
Product response
Determine what reaction-to-fire classification or other product evidence the project actually requires for the exact clay unit.
Complete assembly
Review bedding, adhesive, membranes, insulation, joints and supporting construction; a unit description cannot establish whole-floor performance.
Special exposure
Do not confuse an ordinary floor paver with refractory material intended for kilns, fireplaces or sustained high-temperature service.
Approval route
Use the locally applicable code, test method, classification, documentation and responsible fire professional or authority.
The archived word “fireproof” is too broad to use in a specification. Ask for a current report or declaration with product identity, specimen build-up, method, result, date and scope. Where a rated floor or compartment boundary is required, the design team must evaluate the complete tested or assessed construction.
Verify the current grey brick identity
Request a current product code and drawing showing nominal and actual length, width and thickness, tolerances, rear profile, edges, unit mass and intended installation method. Confirm whether 100 × 200 × 50 mm remains available or is only a legacy size. Identify whether the unit is a bonded tile, a bedded paver or another category.
If the project must match existing work, measure retained units and photograph colour, surface, edge and rear details. Compare them with current samples. A similar grey can be visually convincing while differing in thickness, absorption, geometry or installation needs, so record substitutions openly.
Define traffic, water and slip criteria
State whether the location is interior or exterior, covered or exposed, pedestrian or subject to trolleys, service equipment or vehicles. Record slopes, drains, thresholds, expected contaminants, cleaning regime and freeze–thaw exposure where relevant. The generic label “floor paving” does not answer these questions.
Replace “non-slip” with the project’s applicable test method, condition and acceptance value or class for the exact surface. Wet entrances, ramps and food-service zones can need different analysis from dry internal areas. Define wear and chemical resistance through actual traffic and substances rather than unqualified archive adjectives.
Design the complete floor build-up
Coordinate structure, screed or setting bed, waterproofing when required, drainage, adhesive or mortar, joint materials, movement joints, perimeters and transitions. Confirm compatibility with the current unit and exposure. Establish substrate flatness, slope, strength, moisture and curing criteria before installation.
Place movement and construction joints on the drawings and carry them through the finish as designed. Resolve door clearances, access covers, stair edges and interfaces with other materials. Where heat sources or underfloor heating are present, use the engineered system documents and qualified project team; do not infer insulation or heat resistance from the archived product wording.
Approve a representative grey mock-up
Build a sample area large enough to show shade blending, bond, joint width and colour, lippage, cuts, transitions and cleaning. Evaluate it under representative natural and artificial light. If treatment is proposed, compare treated and untreated areas after the intended curing period.
Photograph the accepted range beside labelled control samples, but keep the physical samples as the governing reference. Record who approved the mock-up, its location and any agreed qualifications so later deliveries are judged against a traceable decision rather than memory.
Use the approved mock-up as the workmanship benchmark. Define factory and site checks for dimensions, warpage, edge damage, shade distribution, substrate acceptance and installed tolerances. Keep delivery and batch records so any variation can be traced and managed before large areas are installed.
Build a defensible order and handover
Map requirements to current drawings, test reports, declarations, samples and trials. A quality-management certificate does not prove reaction to fire, slip, wear, absorption, freeze–thaw or chemical performance. Check that each document applies to the ordered product, thickness and surface, and note any limits or open actions.
Align code, finish range, quantities, cutting and wastage assumptions, specials, spares, packing, delivery sequence and programme before release. Consult the current terracotta floor tile range and relevant project references for initial context, subject to current evidence. At handover, retain as-built areas, batches, cleaning method, maintenance plan and labelled spares.