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IS 8617 : 1994Guide for selection of insulating materials for buildings

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ASHRAE Handbook—Fundamentals (2021) · BS 5250 · EN 13162 to EN 13171
CurrentSpecializedGuidelinesBIMArchitectural · Insulation Materials
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OverviewValues5InternationalTablesFAQ4Related

IS 8617:1994 is the Indian Standard (BIS) for guide for selection of insulating materials for buildings. This guide provides criteria for selecting thermal and acoustic insulating materials for buildings. It outlines key properties like thermal conductivity, fire resistance, and moisture resistance, and presents typical values for common materials to aid designers and engineers in making informed choices.

Provides guidance on selecting appropriate thermal insulating materials for buildings.

Overview

Status
Current
Usage level
Specialized
Domain
Architectural — Insulation Materials
Type
Guidelines
International equivalents
ASHRAE Handbook—Fundamentals (2021) · American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), USABS 5250:2021 · British Standards Institution (BSI), UKEN 13162 to EN 13171 · European Committee for Standardization (CEN), EuropeASTM C1482-23 · American Society for Testing and Materials (ASTM International), USA
Typically used with
IS 3346IS 3144IS 8183IS 12436IS 11239
Also on InfraLens for IS 8617
5Key values1Tables4FAQs

BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.

Practical Notes
! The primary purpose of this standard is to compare materials; for mandatory thermal performance requirements (R-values), refer to the Energy Conservation Building Code (ECBC).
! Always consider moisture management. Many insulation types require a vapour barrier, especially in humid climates or for below-grade applications, to prevent degradation and mold growth.
! Fire properties are as important as thermal properties. Check ratings for flame spread and smoke development, especially for materials used in interiors or exit pathways.
Frequently referenced clauses
Cl. 4Factors Affecting the Selection of Insulating MaterialsCl. 5Properties of Insulating MaterialsCl. 5.2Thermal PropertiesCl. 5.5Fire PerformanceCl. 6Forms of Insulating Materials
Pulled from IS 8617:1994. Browse the full clause & table index below in Tables & Referenced Sections.
mineral woolglass woolexpanded polystyreneextruded polystyrenepolyurethane foamcork

International Equivalents

Similar International Standards
ASHRAE Handbook—Fundamentals (2021)American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), USA
HighCurrent
ASHRAE Handbook—Fundamentals, Chapter 25: Thermal Insulation and Vapor Retarders—Fundamentals & Chapter 26: Applications
Provides comprehensive technical data and guidance on the principles, properties, and application of thermal insulating materials, similar to the IS guide's intent.
BS 5250:2021British Standards Institution (BSI), UK
MediumCurrent
Management of moisture in buildings — Code of practice
Focuses intensely on moisture management, a critical aspect of insulation selection that is also a key consideration in IS 8617.
EN 13162 to EN 13171European Committee for Standardization (CEN), Europe
MediumCurrent
Thermal insulation products for buildings - Factory made products - Specification (A series of standards for different materials, e.g., EN 13163 for EPS)
This series of product-specific standards provides the framework for selecting materials in Europe, though it is not a single comparative guide like IS 8617.
ASTM C1482-23American Society for Testing and Materials (ASTM International), USA
LowCurrent
Standard Guide for Specification of Sustainable Insulation
Offers guidance on selecting insulation, but with a primary focus on sustainability criteria, a more modern and specific lens than the general approach of IS 8617.
Key Differences
≠IS 8617 is a single, descriptive guide providing 'typical' property values, whereas the European approach (EN 13162-13171) uses multiple, separate product standards that require manufacturers to test and declare specific performance levels and classes for their products.
≠IS 8617 provides selection guidance based on broad Indian climatic zones. International standards like the ASHRAE Handbook provide the tools (e.g., psychrometric charts, climate data) for analysis but are not tailored to a specific country's defined zones.
≠Fire performance classification is fundamentally different. IS 8617 uses terms like 'non-combustible' or 'self-extinguishing' based on Indian tests. European standards use the detailed Euroclass system (e.g., A1 to F, with smoke 's' and droplet 'd' ratings from EN 13501-1), which is more granular.
≠The 1994 version of the IS code includes materials like Urea-Formaldehyde (UF) foam with limited health warnings. Modern international guides and standards have much stricter requirements regarding VOCs and harmful substances, and some materials are no longer in common use.
≠Moisture analysis in modern standards like BS 5250 is highly quantitative, involving risk assessment tools like the Glaser method for interstitial condensation. IS 8617 treats moisture resistance as a general property to consider rather than a subject for detailed analysis.
Key Similarities
≈All standards, including IS 8617 and the ASHRAE Handbook, use the same fundamental set of physical properties for material selection: thermal conductivity, density, compressive strength, fire behavior, and moisture resistance.
≈The categorization of insulation materials by form (e.g., fibrous, cellular, granular) is a common framework used in both IS 8617 and international literature like the ASHRAE Handbook to group materials with similar characteristics.
≈The primary importance of thermal conductivity (k-value) or thermal resistance (R-value) as the key performance indicator for insulation is a central, shared principle across all standards.
≈Both the IS guide and its international counterparts provide distinct recommendations based on the building application (e.g., roof, wall, floor), acknowledging that mechanical and moisture-related requirements vary significantly by location.
Parameter Comparison
ParameterIS ValueInternationalSource
Thermal Conductivity (k-value) of Expanded Polystyrene (EPS)0.034 – 0.046 W/m.K (for density 15-35 kg/m³)Declared λ values typically range 0.030 – 0.038 W/m.KEN 13163:2012+A2:2016
Fire Classification ApproachDescriptive terms like 'Self-extinguishing' or 'Non-combustible' based on IS test methods.Euroclass System (A1, A2, B, C, D, E, F) with smoke (s) and droplet (d) subclassifications.EN 13501-1
Maximum Service Temperature of Rock WoolUp to 750 °C> 600 °C, often up to 1000 °C for fibres. Service temp depends on binder.ASHRAE Handbook—Fundamentals
Density Range of Glass Wool10 - 100 kg/m³10 - 120 kg/m³ (depending on product form: rolls, batts, boards)Manufacturer data per EN 13162
Water Vapour Resistance Factor (μ) for Extruded Polystyrene (XPS)Not specified as a μ-value; water vapour permeability is listed as a qualitative factor.Typically 50 – 250 (dimensionless); manufacturers must declare a value (e.g., MU150).EN 13164:2012+A1:2015
Compressive Strength of Corkboard (at 10% deformation)70 - 160 kPa≥100 kPa is a common class, e.g., CS(10\Y)100EN 13170:2012+A1:2015
⚠ Verify details from original standards before use

Key Values5

Quick Reference Values
Thermal Conductivity of Glass Wool (16-96 kg/m³)0.031 - 0.043 W/m.K
Thermal Conductivity of Expanded Polystyrene (EPS) (15-30 kg/m³)0.034 - 0.046 W/m.K
Thermal Conductivity of Extruded Polystyrene (XPS) (28-45 kg/m³)0.029 - 0.036 W/m.K
Service Temperature of Mineral Wool/Rock WoolUp to 750 °C
Service Temperature of Expanded Polystyrene (EPS)Up to 75 °C
Key Formulas
R = d / k — Thermal Resistance (where d is thickness, k is thermal conductivity)
U = 1 / R_total — Overall Heat Transfer Coefficient (where R_total is the sum of all resistances in a building assembly)

Tables & Referenced Sections

Key Tables
Table 1 - Typical Properties of Some Common Building Insulating Materials
Key Clauses
Clause 4 - Factors Affecting the Selection of Insulating Materials
Clause 5 - Properties of Insulating Materials
Clause 5.2 - Thermal Properties
Clause 5.5 - Fire Performance
Clause 6 - Forms of Insulating Materials

Related Resources on InfraLens

Cross-Referenced Codes
IS 3346:2018Thermal Insulation of Buildings - Code of Pra...
→
IS 3144:1992Methods of test for thermal insulating materi...
→
IS 8183:1993Specification for rigid mineral wool thermal ...
→
IS 12436:1988Specification for rigid polyurethane (PU) foa...
→
IS 11239:2007Cellular Concrete Products
→

Frequently Asked Questions4

What is the most important property for a thermal insulator?+
Thermal conductivity (k-value). A lower k-value signifies a better insulating material. (Clause 5.2.1)
Does this code specify the required insulation thickness for a building?+
No, this is a guide for selecting materials. For required thickness or total thermal resistance (R-value), refer to codes like the Energy Conservation Building Code (ECBC) for your climatic zone.
How do I choose between two materials with similar thermal performance?+
Consider other factors listed in the guide, such as fire resistance, moisture resistance, compressive strength (for floors/roofs), cost, and ease of installation. (Clause 4)
What is the main difference between EPS and XPS insulation?+
Both are polystyrene, but XPS (extruded) generally has lower thermal conductivity, higher compressive strength, and superior moisture resistance compared to EPS (expanded) of a similar density. (Table 1)

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