What are the primary properties specified in IS 14769?

The standard specifies a minimum reflectivity of 0.95 and a maximum emissivity of 0.05, along with requirements for water vapor transmission and physical strength (Clause 5).

What is the main purpose of this type of insulation?

Its main purpose is to reduce radiant heat transfer across air spaces. It is highly effective in hot climates to block solar heat gain through roofs.

Does this standard define the R-value for reflective insulation?

No, this standard specifies the material properties. The effective R-value is a function of the entire assembly (including the air gap) and must be calculated or tested for the specific application.

IS 14769

: 2000

Reflective insulation materials

CurrentSpecializedSpecificationBIMArchitectural · Insulation Materials

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This standard specifies the requirements, test methods, and classification for reflective insulation materials, such as aluminum foils and metalized plastic films, used for thermal insulation. It focuses on ensuring key properties like high reflectivity and low emissivity to effectively reduce radiant heat transfer in building applications.

Specifies requirements for reflective thermal insulation materials.

Quick Reference Values

Minimum Reflectivity0.95

Maximum Emissivity0.05

Minimum Purity of Aluminum Foil99.0%

Maximum Water Vapour Transmission Rate1.5 g/m² in 24 h

Surface Temperature for Emissivity TestBetween 20°C and 150°C

Practical Notes

For effective performance, an air gap (typically 20-25mm) must be maintained adjacent to the reflective surface. Without an air gap, the material primarily functions as a vapor barrier with negligible thermal resistance.

The thermal performance (R-value) is a property of the 'system' (insulation + air gap) and depends on the direction of heat flow, not an intrinsic property of the material sheet itself.

During installation, keep the reflective surface clean from dust, oil, and moisture, as contamination can significantly increase emissivity and reduce thermal performance.