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IS 2571:2002 is the Indian Standard (BIS) for laying in-situ terrazzo floor finish. This standard provides comprehensive guidelines for laying in-situ terrazzo (mosaic) floor finishes. It covers material specifications, mix proportions, sub-base preparation, panel layout using dividing strips, and the multi-stage process of curing, grinding, and polishing.
Provides guidelines for the laying and finishing of in-situ terrazzo floors, including material selection and execution.
! Provide dividing strips (glass, aluminum, or brass) to divide the floor into panels not exceeding 2 sqm to prevent shrinkage cracking.
! Ensure the under-layer is adequately compacted and roughened to provide a mechanical key for the terrazzo topping.
! Perform grinding in three distinct stages using progressively finer carborundum stones (coarse, medium, and fine), carefully filling any pinholes with matching cement grout between stages.
Covered pre-cast terrazzo tiles, not the in-situ application process detailed in IS 2571.
Key Differences
≠IS 2571 primarily describes a single method for bonded cementitious terrazzo. The NTMA guide details multiple distinct systems (e.g., Sand Cushion, Monolithic, Bonded, Epoxy, Polyacrylate), each with specific installation requirements.
≠IS 2571 specifies grinding with carborundum stones. Modern international practice, reflected in NTMA guidelines, predominantly uses diamond abrasives, which offer a faster and more precise grinding process.
≠The specified thickness for the terrazzo topping in IS 2571 is significantly thinner (6 mm) than what is typically recommended by NTMA (13 mm / 0.5") or BS 8204-4 (15 mm) for bonded cementitious systems, which can impact long-term wear and durability.
≠While IS 2571 gives a rigid cement-to-aggregate ratio, international guides like NTMA's allow for more flexibility, often relying on project-specific mock-ups and manufacturer recommendations to achieve the desired aesthetic and performance.
Key Similarities
≈All standards mandate the use of divider strips to control shrinkage cracking and to create aesthetic patterns. The principle of dividing the floor into isolated panels is a fundamental and shared concept.
≈The fundamental construction process of a two-course system (underlayer/screed and a terrazzo topping) is common across IS 2571, BS 8204-4, and NTMA's bonded system.
≈All standards emphasize the critical need for proper, extended wet curing (typically 7 days minimum) to ensure the cementitious matrix achieves adequate hydration, strength, and minimizes cracking.
≈The multi-stage finishing process—starting with rough grinding, followed by grouting to fill voids, and then progressing to finer grinding and polishing/sealing—is a universal procedure in all standards.
Parameter Comparison
Parameter
IS Value
International
Source
Terrazzo Topping Thickness
6 mm
≥15 mm
BS 8204-4:2004
Terrazzo Topping Thickness
6 mm
1/2 inch (~13 mm)
NTMA Technical Information Manual (for Bonded System)
Maximum Panel Area
≤1.25 m²
≤2.25 m² (max bay side 1.5 m)
BS 8204-4:2004
Underlayer Thickness
25 mm to 40 mm
25 mm to 40 mm (for bonded screed)
BS 8204-4:2004
Minimum Wet Curing Duration
7 days
At least 7 days
BS 8204-4:2004
Topping Mix Ratio (Cement:Aggregate by Volume)
1 : 2
1:2 to 1:2.5
BS 8204-4:2004
Divider Strip Depth
At least 25 mm
1 1/4 inch (~32 mm) for bonded systems
NTMA Technical Information Manual
⚠ Verify details from original standards before use