Understanding Modular Brick Size as per Indian Standards

When we talk about building materials like bricks, their size is standardized to ensure consistency in construction. In India, these standards are set by the Bureau of Indian Standards (BIS). The question asks specifically about the modular size of bricks.

The modular size of bricks refers to the actual dimensions of a single brick without considering any mortar joint. This is the size the brick manufacturer aims for.

According to Indian Standards (IS: 1077 - 1992 Common Burnt Clay Building Bricks), the standard modular size of a common building brick is:

• Length: 19 cm
• Width: 9 cm
• Height: 9 cm

This size allows for standardizing wall construction. It's important to distinguish this from the nominal size, which includes the thickness of the mortar joint. The common thickness of a mortar joint is 1 cm. So, the nominal size becomes 20 cm × 10 cm × 10 cm (including 1 cm mortar all around, except one face).

Let's look at the given options and compare them with the standard modular brick size:

Based on the comparison, the size 19 cm × 9 cm × 9 cm is the correct modular size of bricks as specified by Indian Standards.

Why is Modular Size Important in Construction?

Using standardized modular brick sizes helps in several ways:

• Uniformity: Ensures consistent brick dimensions across different manufacturers.
• Planning: Makes planning and design easier for architects and engineers.
• Construction Speed: Standard sizes and nominal sizes simplify layout and construction on site.
• Material Estimation: Easier to calculate the number of bricks and amount of mortar needed for a wall.

Revision Table: Key Brick Sizes

Additional Information: Brick Types and Standards

Apart from the standard modular size, Indian Standards also classify bricks based on their strength (classes) and other properties. Understanding these classifications is crucial for selecting the right brick for a specific construction purpose.

• Indian Standards (BIS): The primary body for setting standards for construction materials in India, including bricks. IS 1077 is a key standard for common building bricks.
• Classification: Bricks are often classified by compressive strength, affecting their suitability for different structural loads.
• Other Brick Types: Besides common burnt clay bricks, there are fly ash bricks, concrete bricks, etc., which may have slightly different standard sizes or properties. However, the 19x9x9 cm is the widely accepted modular size for standard burnt clay bricks.

Knowing the standard modular size of bricks is a fundamental concept in civil engineering and construction practices in India.