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IS 3548:1988 is the Indian Standard (BIS) for glazing in buildings. This code provides guidelines for the selection, cutting, and installation of glass in building facades, windows, and doors. It specifies minimum clearances, glazing materials, and setting practices to safely accommodate wind loads and thermal movements without causing glass breakage.
Code of Practice for Glazing in Buildings
Overview
Status
Current
Usage level
Specialized
Domain
Architectural — Building Construction Practices incl. Painting, Varnishing
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Always use setting blocks made of non-absorbent, durable material (like neoprene or lead) to support glass weight and prevent glass-to-metal contact.
! Ensure adequate edge clearance is provided to prevent glass breakage due to thermal expansion or frame deflection.
! Weep holes must be provided in the bottom framing of external glazing to drain out any infiltrated moisture.
Comprehensive code covering wind loads, human impact safety, and installation practices for glass in buildings.
BS 6262-1:2017BSI (British Standards Institution), United Kingdom
HighCurrent
Glazing for buildings - Part 1: General methodology for the selection of glazing
Provides the overarching methodology for selecting glazing, referencing other parts for wind, safety, fire, and energy.
ASTM E1300-16ASTM International, USA
MediumCurrent
Standard Practice for Determining Load Resistance of Glass in Buildings
Focuses specifically on the analytical procedure for determining glass resistance to uniform lateral loads, like wind.
NZS 4223.3:2016Standards New Zealand, New Zealand
MediumCurrent
Glazing in buildings - Part 3: Human impact safety requirements
Specifically details requirements for safety glass in locations subject to human impact, similar to IS 3548's Clause 9.
Key Differences
≠IS 3548 uses a single simplified chart (Fig. 1) for a fixed wind pressure of 1.5 kN/m² to determine glass thickness. Modern standards like ASTM E1300 and AS 1288 use complex analytical procedures or detailed charts that account for building-specific wind loads, load duration, and glass type factors.
≠The Indian standard does not provide specific guidance on modern glazing systems like structural silicone glazing (SSG) or bolted glass assemblies, which are extensively covered in contemporary international codes.
≠IS 3548 has minimal requirements regarding energy performance. In contrast, modern international standards are heavily integrated with national energy codes, providing detailed guidance on selecting glazing based on U-value, Solar Heat Gain Coefficient (SHGC), and Visible Light Transmittance (VLT).
≠The criteria for safety glazing in IS 3548 (e.g., critical locations) are less comprehensive than in standards like AS 1288 or BS 6262-4, which define a wider range of hazardous locations (e.g., bathrooms, stairs, balustrades) with greater specificity.
Key Similarities
≈All standards recognize wind as a primary lateral load and provide methodologies, albeit of varying complexity, to determine the necessary glass thickness to resist it.
≈All codes mandate the use of safety glass (typically toughened or laminated) in high-risk areas prone to human impact, such as doors and low-level glazing, to mitigate injury.
≈The fundamental principles of glazing installation, such as providing adequate edge clearance for thermal movement and sufficient edge cover (bite) for support, are common across all standards.
≈The standards categorize and recognize the main types of architectural glass, including annealed, toughened (tempered), laminated, and heat-strengthened, and define their appropriate applications.
Parameter Comparison
Parameter
IS Value
International
Source
Safety Glazing Requirement in Doors
Required for all glass panels in doors (Clause 9.2.1).
Required for all glass in doors. Must be Grade A safety glass (toughened or laminated).
AS 1288:2021
Safety Glazing Height Threshold (Low-Level)
Required if the lowest sight line is less than 800 mm from the finished floor level (Clause 9.2.2).
Required if the bottom edge is within 500 mm of the floor, or for panes starting below 1200 mm in 'restricted' risk areas.
BS 6262-4:2018
Minimum Edge Cover (Bite)
Generally 6 mm, but can be more depending on pane size and putty type (Clause 10.3.3).
Varies by pane size and frame type, typically 6 mm to 15 mm. For a 1-2 m² pane, 10 mm is common.
AS 1288:2021 (Table 5.2)
Minimum Edge Clearance
3 mm for panes up to 1m, 5 mm for larger panes (Clause 10.3.2).
Generally 3 mm for smaller panes, increasing with pane size. A 5 mm clearance is common for larger residential/commercial panes.
AS 1288:2021 (Clause 5.5.3)
Glass Thickness Determination Method
Graphical chart based on glass area for a fixed wind pressure of 1.5 kN/m².
Analytical procedure using non-factored load charts, glass type factors (GTF), and load duration factors.
ASTM E1300-16
Toughened Glass Min. Surface Compression
Not less than 100 MPa (as per IS 2553 Part 1).
Greater than or equal to 69 MPa (10,000 psi).
ASTM C1048
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Minimum edge clearance for glass up to 6mm thickness3 mm
Minimum edge cover (bite) for glass up to 6mm thickness5 mm
Minimum face clearance3 mm
Setting block length25 mm to 75 mm
Setting block placementL/4 from corners (quarter points)
Tables & Referenced Sections
Key Tables
Table 1 - Minimum Edge Clearance, Face Clearance and Edge Cover
Table 2 - Recommended Thickness of Sheet Glass for Wind Loads
Key Clauses
Clause 4 - Selection of Glass based on wind pressure
How do you determine the required glass thickness?+
Glass thickness is selected based on the design wind pressure and the maximum unsupported area of the glass pane.
Where should setting blocks be placed?+
At the bottom edge of the glass, typically located at quarter points (L/4) from the bottom corners to distribute weight evenly.
What is edge cover (bite)?+
It is the distance the glass extends into the frame or glazing channel, ensuring it does not pop out under wind load (typically minimum 5mm for standard glass).