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IS 7956:1975 is the Indian Standard (BIS) for recommendations for selection of dairy floor finishes. This standard provides recommendations for the selection of suitable floor finishes for different areas within a dairy plant. It covers essential performance requirements like imperмеability, hygiene, slip resistance, and resistance to chemicals and thermal shock. The code guides users in choosing appropriate materials like tiles, stone, or resinous systems for specific zones such as milk processing halls, cold storage, and laboratories.
Recommendations for selection of dairy floor finishes
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Flooring, Wall Finishing and Roofing
! Proper surface preparation of the concrete sub-base is critical for the long-term performance of any floor finish, especially resinous coatings.
! Joint design and sealing are common failure points. Using appropriate chemical-resistant, flexible sealants is essential to prevent contamination and corrosion.
! Consider the entire cleaning regimen, including hot water, steam, and chemical agents (acids/alkalis), when selecting a floor, not just resistance to milk products.
Provides comprehensive requirements for food premises construction, with a detailed section on floors directly applicable to dairies.
Campden BRI Guideline No. 21Campden BRI, United Kingdom
HighCurrent
Flooring in the Food Industry: A Guide to Selection and Installation
A highly respected industry guide focused entirely on the selection, installation, and maintenance of hygienic flooring, including for dairies.
General Specifications for Dairy Plants Approved for USDA InspectionUnited States Department of Agriculture (USDA), USA
MediumCurrent
General Specifications for Dairy Plants Approved for USDA Inspection
A regulatory document outlining performance requirements for dairy plant construction, including floors, to ensure sanitation and safety.
ISO/TS 22002-1:2009International Organization for Standardization (ISO), International
LowCurrent
Prerequisite programmes on food safety — Part 1: Food manufacturing
Specifies requirements for buildings and utilities, stating floors must be durable and easy to clean, but does not detail material selection.
Key Differences
≠IS 7956 primarily recommends traditional materials like acid-resisting bricks, tiles, and flagstones. International standards heavily feature modern synthetic resin systems like polyurethane (PU) concrete, epoxies, and methyl methacrylate (MMA).
≠The Indian standard is largely prescriptive, suggesting specific materials for specific areas. Modern equivalents like AS 4674 are more performance-based, defining characteristics such as 'impervious', 'cleanable', and chemical resistance, allowing for material innovation.
≠International standards provide much greater detail on critical junctions, such as specifying minimum radii for coving (floor-to-wall joints) and advanced designs for hygienic drainage channels, which are only generally mentioned in IS 7956.
≠Modern standards often incorporate principles of hygienic zoning (e.g., high/medium/low risk areas), dictating flooring specifications based on process risk. This concept is absent in the 1975 Indian standard.
Key Similarities
≈All standards universally require that dairy floors be impervious to liquids like milk, water, and cleaning solutions to prevent contamination and microbial growth.
≈The fundamental need for adequate floor slopes (falls) to drains to prevent water pooling and ensure effective drainage is a core principle in both IS 7956 and its international counterparts.
≈Both the Indian and international standards emphasize the importance of chemical resistance, specifically against lactic acid from milk products and the various acids and alkalis used in cleaning agents.
≈Providing a slip-resistant surface to ensure worker safety is a common requirement across all relevant standards, acknowledging the wet and often greasy conditions in a dairy.
≈All standards recognize the need for seamless, coved, or rounded junctions between floors and walls to eliminate corners that are difficult to clean and can harbor bacteria.
Parameter Comparison
Parameter
IS Value
International
Source
Recommended Floor Slope (General)
1 in 40 to 1 in 60 (1.67% to 2.5%)
Minimum 1:100 (1%), with 1:80 (1.25%) preferred in wet areas.
AS 4674:2023
Coving (Floor-to-Wall Joint)
Specifies 'rounded corners' but no mandatory radius dimension.
Must be coved with an internal radius of not less than 25 mm.
AS 4674:2023
Recommended Finish for Milk Reception/Processing
Acid-resisting bricks or tiles.
Heavy-duty (6-9 mm) polyurethane (PU) concrete screed for superior thermal shock and chemical resistance.
Campden BRI Guideline No. 21
Water Absorption (Vitreous Tiles)
Refers to IS 4457, which specifies a maximum of 2.0%.
Performance requirement: Floors shall be 'unable to absorb grease, food particles or water'. Material standard for tiles (ISO 13006 / EN 14411 Group BIa) is ≤ 0.5%.
AS 4674:2023
Drainage Channel Material
Recommends cast iron or glazed stoneware.
Primarily stainless steel (Grade 304 or 316) for hygienic design and durability.
Campden BRI Guideline No. 21
Joints in Tiled Floors
Recommends cement mortar or special acid-resisting cement for jointing.
Recommends high-performance, low-absorption grouts like epoxy or polyurethane grout; cementitious grouts are generally discouraged in wet process areas.
Campden BRI Guideline No. 21
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Recommended minimum slope for drainage1 in 80
Typical epoxy resin screed thickness5 to 6 mm
Lactic acid concentration considered for resistanceUp to 10 percent
Maximum water absorption for floor tiles0.5 percent
Minimum curing period for concrete sub-floor28 days
Tables & Referenced Sections
Key Tables
Table 1 - Selection of Floor Finishes for Different Areas in a Dairy Plant
Key Clauses
Clause 3 - Essential Requirements of a Dairy Floor Finish
Clause 4 - Types of Floor Finishes
Clause 5 - Selection of Floor Finishes for Different Areas
What flooring is recommended for a milk processing hall?+
Heavy-duty acid-resistant tiles or a heavy-duty cast-in-situ floor like polyurethane (PU) concrete or epoxy screed are recommended for their durability and hygiene (Table 1).
What are the most important requirements for a dairy floor?+
The floor must be impervious, non-toxic, non-slip, durable, easy to clean, and resistant to lactic acid, cleaning chemicals, and thermal shock from hot water or steam (Clause 3).
What is the recommended slope for a dairy floor?+
A minimum slope of 1 in 80 is recommended to ensure effective drainage of liquids, preventing ponding and bacterial growth (Clause 3.1.2).