When is a lintel band mandatory?

It is mandatory for all load-bearing masonry buildings in seismic zones III, IV, and V, categorized under Building Categories B, C, D, and E (Table 1).

What is the recommended mortar for masonry in high seismic zones?

For Category D and E buildings (high seismic zones), richer mortar mixes like M2 (1:4 cement-sand) or equivalent are required (Table 4).

How much vertical steel is required at corners?

It varies based on building category and the number of storeys, typically ranging from a single 10 mm to 16 mm diameter high-strength deformed bar (Table 7).

IS 4326

: 1996

Code of Practice for Earthquake Resistant Design and Construction of Buildings - Requirements for Masonry Buildings

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This code establishes guidelines for the earthquake-resistant design and construction of buildings, with a primary focus on unreinforced and reinforced masonry structures. It provides essential prescriptive detailing requirements, such as seismic bands and vertical corner reinforcements, to ensure buildings exhibit box-like action and avoid brittle failure during seismic events.

Lays down requirements for earthquake resistant design and construction of masonry buildings.

Quick Reference Values

minimum thickness of rcc band75 mm

minimum width of separation joint15 mm

minimum longitudinal steel in bands2 bars of 8 mm dia (high strength) or 10 mm dia (mild steel)

minimum clear cover for band reinforcement15 mm

maximum height of flat roof masonry building3 storeys (depending on building category)

Practical Notes

Continuous lintel and roof bands are the most critical elements in tying masonry walls together to act as a single unit.

Avoid large asymmetric window and door openings, and maintain minimum specified masonry distances from corners to the nearest opening.

Ensure separation joints between adjacent structurally independent units are kept clear of debris to prevent pounding during earthquakes.