What is the allowable percentage of perforations?

The total area of perforations should be between 20% and 45% of the gross area of the brick face (Clause 5.1).

What is the minimum compressive strength required for perforated bricks?

The minimum compressive strength should not be less than 7.0 N/mm² (Clause 6.1).

What is the maximum allowed water absorption?

The water absorption shall not exceed 15 percent by weight after 24 hours of cold water immersion (Clause 6.2).

Which code is used for testing the compressive strength and water absorption?

Testing procedures are strictly specified in IS 3495 (Parts 1 to 4).

IS 2222

: 1991

Specification for burnt clay perforated building bricks

CurrentSpecializedSpecificationMaterials Science · Clay and Stabilized Soil Products

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This standard lays down the specifications for dimensions, quality requirements, and testing of burnt clay perforated building bricks. It covers parameters like compressive strength, water absorption, efflorescence, and the specific geometry of perforations to ensure structural adequacy and thermal efficiency.

Specification for burnt clay perforated building bricks

Quick Reference Values

minimum compressive strength7.0 N/mm²

total perforation area20% to 45% of gross area

max area of single perforation500 mm²

minimum web thickness15 mm

maximum water absorption15% by weight

maximum efflorescenceSlight

Practical Notes

Perforated bricks should generally be laid with their perforations vertical to maximize load-bearing capacity.

They offer better thermal insulation and reduced dead weight compared to solid bricks but require careful handling to prevent edge breakages.

Ensure mortar does not completely fill the perforations during masonry construction, as it defeats the insulation and weight reduction purposes.