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IS 1946:1961 is the Indian Standard (BIS) for use of fixing devices in walls, ceilings and floors of solid construction. This standard provides guidelines for the selection, sizing, and installation of fixing devices such as expansion plugs, anchor bolts, and wooden plugs in solid construction materials like walls, ceilings, and floors. It outlines the preparation of holes, embedment techniques, and safety factors to ensure secure attachment of structural and architectural fixtures.
Code of practice for use of fixing devices in walls, ceilings and floors of solid construction
Overview
Status
Current
Usage level
Specialized
Domain
Structural Engineering — 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
! Ensure the drilled hole diameter strictly matches the anchor manufacturer or code recommendations to prevent loss of pull-out strength.
! Avoid using traditional wooden plugs in damp environments or exposed external walls due to the risk of moisture expansion, decay, and subsequent loss of grip.
! When installing expansion anchors near the edge of a concrete or masonry member, strictly maintain minimum edge distances to avoid substrate cracking or edge breakout.
BS 8539:2012BSI - British Standards Institution, UK
HighCurrent
Code of practice for the selection and installation of post-installed anchors in concrete and masonry
Both are 'codes of practice' for using fixings, but BS 8539 covers modern anchors and installation verification.
EN 1992-4:2018CEN - European Committee for Standardization, Europe
MediumCurrent
Eurocode 2: Design of concrete structures - Part 4: Design of fastenings for use in concrete
Provides the detailed engineering design basis for fasteners, which is absent in the prescriptive IS 1946.
ACI 318-19ACI - American Concrete Institute, USA
MediumCurrent
Building Code Requirements for Structural Concrete
Chapter 17, 'Anchoring to Concrete', provides the US equivalent of design rules for modern anchors.
ETAG 001EOTA - European Organisation for Technical Assessment, Europe
LowWithdrawn
Guideline for European Technical Approval of Metal Anchors for Use in Concrete
Defined the testing and qualification framework for modern anchors, a concept not present in IS 1946.
Key Differences
≠IS 1946 covers rudimentary fixings like wooden plugs, fibre plugs, and rag bolts, whereas modern standards cover engineered mechanical and chemical (bonded) anchors.
≠The Indian standard provides simple 'safe working loads' based on prescriptive rules. International standards like EN 1992-4 use limit state design, analyzing multiple complex failure modes (e.g., concrete cone failure, steel failure, pull-out).
≠Modern standards require anchors to be qualified through a rigorous testing and assessment system (e.g., a European Technical Assessment - ETA). IS 1946 has no such requirement for pre-qualification of fixing devices.
≠International codes have extensive provisions for dynamic, fatigue, seismic, and fire loading conditions, which are entirely outside the scope of IS 1946.
≠IS 1946 gives vague guidance on spacing and edge distances ('not too near an edge'). Modern codes provide precise mathematical formulas to calculate capacity reduction based on specific edge distances and anchor spacing.
Key Similarities
≈Both the Indian and international standards share the fundamental purpose of providing guidance to ensure fixings are installed safely and can carry their intended loads.
≈All standards recognize the critical importance of the base material (concrete, masonry), emphasizing that its strength and condition govern the performance of the fixing.
≈All standards stress the importance of correct installation procedures, specifically drilling holes to the correct size and depth and ensuring they are clean of dust and debris before inserting the fixing.
≈Both IS 1946 and modern codes (like BS 8539) recommend on-site proof testing of a sample of installed fixings to verify installation quality, typically applying a load of 1.5 times the working/design load.
Parameter Comparison
Parameter
IS Value
International
Source
Fixing Types Covered
Wooden plugs, fibre plugs, metal expansion bolts ('Rawlbolts'), rag bolts.
Can wooden plugs be used in all building environments?+
No, they should be avoided in damp conditions or areas prone to termite attack to prevent decay and loss of anchor grip.
What factors dictate the pull-out strength of a fixing device?+
The compressive strength of the base material (e.g., concrete vs. masonry), the precision of the drilled hole, and the embedment depth of the fastener.
What is the recommended method for making holes for fixing devices?+
Rotary or rotary-percussion drilling is preferred over manual hand-jumping to maintain strict hole tolerances and prevent internal damage to the base material.