3 No Brick

🧱 3 No. Brick (Third-Class Brick) – Description

✅ General Description:

• Name: 3 No. Brick (Third-Class Brick)

• Type: Sun-dried or poorly kiln-burnt clay brick

• Color: Dull red, dark brown, or patchy; may have blackened or under-burnt areas

• Shape: Irregular; often misshapen with broken edges and rough surfaces

• Size (Highly Variable):

  • No fixed standard; may vary significantly from brick to brick

• Weight: ~2.0–2.8 kg (less dense than higher-grade bricks)

• Compressive Strength: < 3.5 N/mm²

• Water Absorption: > 20% (can be as high as 25–30%)

• Firing: Under-burnt or unevenly fired in traditional clamps or low-efficiency kilns

• Use: Temporary structures, non-structural uses, fill material

✅ Properties:

❌ Not Suitable For:

• Load-bearing walls

• Water-exposed areas

• Permanent or high-quality structures

• Places requiring precise alignment and finish

✅ Typical Uses:

• Temporary sheds or site offices

• Internal fill in composite walls

• Garden edging (if plastered or hidden)

• Low-cost or rural structures where durability isn't critical

⚠️ Important Notes:

• Must be plastered or rendered if used in walls, to prevent water damage

• Not recommended in regions with heavy rainfall or seismic activity

• Should be avoided in modern construction unless budget constraints are extreme