IS 1237:2015 is the Indian Standard (BIS) for cement concrete flooring tiles - specification. This standard specifies the requirements for the manufacture, dimensions, physical properties, and testing procedures for cement concrete flooring tiles, categorizing them into general purpose and heavy-duty tiles.
Specifies requirements for cement concrete tiles used for flooring, including dimensions, physical properties, and testing methods.
Key reference values — verify against the current code edition / project specification.
| Reference | Value | Clause |
|---|---|---|
| Subject | Cement-concrete flooring tiles | Scope |
| Wet transverse strength | Minimum per the spec (general/heavy duty) | Acceptance |
| Water absorption | Limited (≤ ~10 % typical) | Acceptance |
| Wearing | Abrasion / wear-depth limit | Acceptance |
| Dimensions | Size & thickness tolerances | Acceptance |
| Read with | IS 1443 (laying) / IS 13801 (chequered tiles) | Cross-ref |
IS 1237:2015 is the Indian Standard for Cement Concrete Flooring Tiles — Specification. It covers precast cement-concrete tiles used for:
Key distinction from related codes: - IS 1237 = precast tiles (laid like vitrified tiles, in mortar bed) - IS 1199 = sampling of fresh concrete (also for cast-in-situ flooring) - IS 9197 = paving block specifications (interlocking concrete blocks for outdoor pavements) - IS 13801 = chequered concrete tiles for non-slip applications (similar to IS 1237 with mandatory pattern)
The code covers tile types: plain, coloured, terrazzo, mosaic, chequered, decorative. Sizes typically 200 × 200 mm, 250 × 250 mm, 300 × 300 mm, 400 × 400 mm; thickness 20-40 mm.
Six types covered (Clause 4):
Two structural classes (Clause 5) based on intended use: - General Purpose (Class GP): residential, light commercial, internal - Heavy Duty (Class HD): industrial, vehicular, public outdoor
Acceptance criteria (Clause 6):
| Property | GP class | HD class | Test method | |---|---|---|---| | Min compressive strength (MPa) | 25 | 35 | IS 1237 Annex C | | Min flexural strength (MPa) | 4.5 | 5.5 | IS 1237 Annex D | | Min water absorption (% by mass) | ≤ 8 | ≤ 7 | IS 1237 Annex E | | Min wear (mm, after 50 m of abrasion) | ≤ 3.5 | ≤ 2.5 | IS 1237 Annex F | | Dimensional tolerance | ± 2 mm | ± 1.5 mm | Annex B | | Surface flatness | ≤ 0.5 mm/m | ≤ 0.3 mm/m | Annex B | | Soundness — Le Chatelier | ≤ 10 mm | ≤ 10 mm | IS 4031 Part 3 |
Wearing layer (Clause 4.3): - For plain / decorative tiles: 1:2 cement-sand mix with rich aggregate (M25 grade); thickness ≥ 8 mm - For terrazzo: 1:2 cement + marble/granite chips (6 mm) with white cement for matrix, ground+polished after curing - For chequered: 1:2.5 cement-sand with deformed top surface; total thickness ≥ 25 mm
Backing layer: 1:5 cement-sand-stone-dust mix for cost reduction; total tile thickness 20-40 mm depending on class.
Curing: tiles must be cured minimum 14 days before despatch; 28 days before installation in heavy-traffic areas.
Selection guide:
| Application | Type | Class | Tile size | |---|---|---|---| | Residential bedroom flooring | A (Plain) | GP | 300 × 300 mm | | Residential kitchen / bathroom | A or E (Anti-slip) | GP | 200 × 200 mm | | Office corridor / commercial | A or B (Terrazzo) | GP | 400 × 400 mm | | Industrial workshop | F (Industrial) | HD | 300 × 300 × 30 mm | | Warehouse with forklift traffic | F | HD | 400 × 400 × 40 mm | | External plaza / public footpath | F or E (Anti-slip) | HD | 250 × 250 × 30 mm | | Swimming pool surround | E (Chequered anti-slip) | HD | 300 × 300 × 30 mm |
Installation (IS 1443:1972, Code of Practice for Laying):
1. Substrate: clean, level, structurally sound. Cement-sand screed (1:4, 25 mm minimum) over RCC slab for indoor; lean concrete base (M15, 75 mm) for outdoor on prepared soil.
2. Bedding mortar: 1:4 cement-sand mortar, 25-40 mm thick. Apply on small section (~2-3 m²) at a time.
3. Tile laying: place tile firmly on mortar bed; tap with rubber mallet to set; use spirit level to verify horizontal alignment. Maintain 2-3 mm gap between tiles (filled with neat cement grout later).
4. Grouting: after 24-48 hours, fill joints with neat cement grout (or coloured grout for decorative tiles). Clean excess from surface immediately.
5. Curing: light moist curing for 7 days minimum. Avoid heavy traffic for 14-21 days.
6. Finishing: for terrazzo tiles, post-installation grinding + polishing using emery stones and final crystallisation with oxalic / chemicals — produces the smooth glossy 'mosaic flooring' surface.
Wear performance: well-installed IS 1237 HD-class tiles in industrial / public use have a service life of 15-25 years before significant wear. GP-class indoor tiles typically last the building lifetime (50+ years) unless damaged by impact.
1. Inadequate substrate — cracked or uneven RCC slab causes tile failure within 2-3 years. Resurface the slab before tile installation if cracking visible.
2. Wrong class for use — using GP-class tiles in industrial corridor; visible wear within 6-12 months. Specify HD for any commercial vehicular or heavy-pedestrian traffic.
3. No expansion joints — long stretches of tiled flooring without expansion joints crack from thermal/moisture movement. Provide control joints every 6-8 m, filled with elastomeric sealant.
4. Insufficient curing before installation — tiles cured only 7 days at the manufacturer's yard then installed continue to shrink in place, causing hairline cracks at joints. Mandate 28-day curing certificate from manufacturer.
5. Skipping bedding mortar level check — uneven bedding makes tiles 'hollow' (gap between tile and mortar), audible when tapped. Hollow tiles fracture under point loads. Verify by tapping each tile after placement.
6. Wrong grout colour or material — using ordinary cement grout in decorative areas creates contrast that ruins the aesthetic. Match grout to tile colour. For wet areas (bathrooms, kitchens), use water-resistant grout (cementitious + polymer additive, not pure cement).
7. Acid washing terrazzo too soon — terrazzo polishing with oxalic acid before adequate cure (< 14 days) damages the cement matrix. Wait 14-21 days minimum before final polishing.
8. Hexagonal / triangular custom shapes without supplier confirmation — IS 1237 specifies rectangular tiles. Custom shapes require special manufacturing; quality variability is high. Pre-qualify the supplier and inspect each batch.
IS 1237:2015 is the current revision (replacing IS 1237:1980). The 2015 revision updated: - Wear-resistance test methodology (from earlier Bohme abrasion to modern wider-wheel methods) - Surface flatness and dimensional tolerances - Inclusion of decorative tile categories (Types C, D) - Eco-friendly admixture provisions
Market reality: cement-concrete tiles are losing market share to: - Vitrified tiles (IS 13753, IS 15622) — denser, less porous, more colourful; cost 2-3× more but visually superior - Ceramic tiles — for wet areas (bathrooms, kitchens) where the tile choice is governed by aesthetics - Natural stone tiles (granite, marble, kota stone) — for premium interiors - Engineered stone / quartz — for high-end commercial
Where IS 1237 cement-concrete tiles still dominate: - Industrial flooring — workshops, garages, factories — wear-resistance + cost-effectiveness - Outdoor public spaces — plazas, parking, school grounds — durability + cost - Affordable housing — government schemes (PMAY, etc.) where total flooring cost matters - Restoration of vintage 1950s-70s buildings — original mosaic / chequered tile work to be matched
For budget-conscious residential: IS 1237 GP-class plain tiles in utility areas (servant rooms, storage, balcony) are still cost-effective at ₹40-80/sq ft installed (vs ₹150-300/sq ft for premium vitrified). For visible main areas, vitrified is the standard choice.
For industrial / institutional: IS 1237 HD-class remains the workhorse — durable, low-maintenance, easily replaced if damaged. Specify HD class with documented wear and compressive strength testing per batch.
Procurement tip: BIS-licensed manufacturers (NITCO, JK Tiles, RAK Tiles, ASIAN Granito for premium; numerous local for budget) deliver IS 1237 reliably. Non-licensed local manufacturers vary in quality. Mandate batch-wise strength + wear test certificates for any order > 5,000 sq ft.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Water Absorption (by mass) | ≤ 10% (for an individual tile) | ≤ 6% (for Class 1, internal use tiles) | EN 13748-1:2004 |
| Flexural Strength (Transverse Strength) | ≥ 3.0 MPa (average, Heavy Duty) | ≥ 4.0 MPa (characteristic strength for external use) | EN 13748-2:2004 |
| Abrasion Resistance (Heavy/Normal Use) | ≤ 2.0 mm average wear depth | ≤ 25 mm groove length (Class 2, Normal use) | EN 13748-1:2004 |
| Wearing Layer Thickness | ≥ 5 mm (for 20-25 mm thick tiles) | ≥ 8 mm (for double layer tiles) | EN 13748-1:2004 |
| Thickness Tolerance | ± 2.0 mm | ± 2.0 mm (for nominal thickness ≤ 40 mm) | EN 13748-1:2004 |
| Length/Width Tolerance | ± 1.0 mm | ± 0.3% of nominal dimension (max ± 2.0 mm) | EN 13748-1:2004 |