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IS 14143:1994 is the Indian Standard (BIS) for prefabricated brick panel and partially precast concrete joist for flooring and roofing. This standard specifies the requirements for a composite flooring and roofing system using prefabricated brick panels supported on partially precast reinforced concrete joists. It covers the materials, dimensions, manufacturing, erection, and design criteria for this rapid construction technology, suitable for residential and commercial buildings.
prefabricated brick panel and partially precast concrete joist for flooring and roofing
Overview
Status
Current
Usage level
Specialized
Domain
Structural Engineering — Planning, Housing and Pre-fabricated Construction
EN 15037-1:2006 + EN 15037-3:2006CEN (European Committee for Standardization), Europe
HighCurrent
Precast concrete products - Beam-and-block floor systems - Part 1: Beams / Part 3: Clay blocks
Covers the two key components of the system: precast concrete beams (joists) and fired clay filler blocks (brick panels).
BS 8110-1:1997BSI (British Standards Institution), UK
MediumWithdrawn
Structural use of concrete - Part 1: Code of practice for design and construction
Contained design rules for ribbed slabs with permanent hollow or solid block fillers, a structurally analogous system.
ACI 318-19ACI (American Concrete Institute), USA
LowCurrent
Building Code Requirements for Structural Concrete and Commentary
Provides general design principles for composite concrete flexural members, which is the underlying theory, but is not specific to this product system.
AS 3600:2018Standards Australia, Australia
LowCurrent
Concrete structures
Includes design provisions for composite slabs and precast concrete, but does not specify a beam-and-brick-panel system.
Key Differences
≠IS 14143 specifies prefabricated panels made from multiple burnt clay bricks, whereas European systems (EN 15037) typically use individual clay or concrete blocks placed between joists.
≠The Indian standard is based on a 1994 understanding, permitting Working Stress Method for design, while modern equivalents like the Eurocodes (informing EN 15037) and ACI 318 exclusively use Limit State Design / Ultimate Strength Design.
≠IS 14143 is an integrated standard covering materials, design, and construction of the entire system in one document. The European approach is modular, with separate standards for beams (EN 15037-1), blocks (EN 15037-3), and general concrete design (EN 1992).
≠IS 14143 is prescriptive about joist reinforcement using mild steel stirrups, whereas EN 15037-1 explicitly includes provisions for both reinforced and prestressed concrete beams, allowing for longer spans and more efficient designs.
Key Similarities
≈The fundamental structural concept of using precast joists as permanent shuttering and primary reinforcement, with infill units and a cast-in-situ topping to form a composite T-beam, is identical across all related systems.
≈All standards rely on achieving composite action through the shear connection between the precast joist and the in-situ concrete topping slab for the final structural capacity.
≈The basic construction sequence is analogous: positioning of precast joists, installation of infill units (panels or blocks), placement of top reinforcement mesh, and casting of the structural topping.
≈The infill units (brick panels in IS 14143, clay/concrete blocks in EN 15037) are primarily treated as void-formers and non-structural in the main flexural design, with their weight considered as dead load.
Parameter Comparison
Parameter
IS Value
International
Source
Minimum Concrete Grade for Joists
M20 (Characteristic compressive strength of 20 N/mm²)
C25/30 (Cylinder strength of 25 N/mm²) for reinforced concrete beams
EN 1992-1-1 (referenced by EN 15037-1)
Minimum Compressive Strength of Bricks
7.5 N/mm²
Varies by class; typically ≥ 6 or 10 N/mm² (normalized mean compressive strength)
EN 15037-3 (via EN 771-1)
Minimum Concrete Topping Thickness
40 mm
40 mm above the blocks (can be 50 mm or more depending on design)
EN 1992-1-1 / Common Practice
Nominal Concrete Cover (Joist, mild exposure)
15 mm or bar diameter, whichever is greater
20 mm (for exposure class XC1, equivalent to mild)
EN 1992-1-1
Curing Requirement for Precast Joists
Minimum 7 days before handling
Performance-based: based on achieving a specified handling strength, not a fixed time duration.
EN 13369 (Common rules for precast)
Design Live Load for Testing
1.25 x (Dead Load) + 1.5 x (Live Load) for strength test
1.35 x (Permanent Actions) + 1.5 x (Variable Actions) for ULS design
EN 1990 (Basis of structural design)
Reinforcement Type for Joists
Mild steel or high strength deformed bars
Reinforcing steel (e.g. B500B) or prestressing steel (strands/wires)
EN 15037-1
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Minimum grade of concrete for precast joistsM20
Minimum grade of concrete for in-situ toppingM15
Minimum compressive strength of bricks7.5 N/mm²
Maximum water absorption for bricks20% by weight
Minimum thickness of in-situ structural topping40 mm
Minimum end bearing for joists on support75 mm
Tables & Referenced Sections
Key Tables
Table 1 - Physical Requirements of Burnt Clay Bricks
Table 2 - Permissible Tolerances for Precast Joists
Key Clauses
Clause 4 - Materials
Clause 5 - Dimensions and Tolerances
Clause 6 - Manufacture
Clause 7 - Erection of Floor/Roof
Clause 9 - Design Considerations
Appendix A - Method for Determination of Strength and Stiffness