Sizes of Cover Block Used Nepal

​1. Raft foundation bottoms/ sides : 50-75mm

2. Strap Beam: 35mm

3. Slab:15mm

4. Column: 40 mm

5. Shear wall:25mm

6. Flat slab: 20mm

7. Stair case : 15 mm

8. Retaining wall: 20/25 mm on earth

9. Water retaining structure: 20/30 mm

Types of cover Block

1. Steel cover block

2. PVC block

3. Cement masonry 

4. Aluminium cover

5. Stone