Building Construction Methods and Components
Building Construction Methods and Components tests how a building is assembled from foundation to roof, and why each component is detailed the way it is.
Substructure
- Foundation: shallow footings suit good soil; deep foundations such as piles suit weak soil. The foundation transfers load to the ground below weather action.
- Plinth and DPC: the plinth raises the floor above ground; the damp-proof course at plinth level stops rising moisture. DPC must be continuous and overlap at junctions.
- Excavation and backfill: keep trenches dry and compact backfill in layers.
Superstructure
- Walls: load-bearing or non-load-bearing; 230 mm external and 115 mm internal walls are common. Openings need lintels or beams.
- Columns, beams and slabs: an RCC frame carries loads; slab thickness and reinforcement follow design.
- Roof, staircase and parapet: roof slope aids drainage; riser and tread should be comfortable; the parapet provides safety.
Worked example
A 5 m long, 3 m high, 230 mm thick brick wall. Volume = 5 × 3 × 0.23 = 3.45 m³. With a 10 mm mortar joint, each brick module = 0.20 × 0.10 × 0.10 = 0.002 m³. Bricks = 3.45 ÷ 0.002 = 1,725. Add 5% breakage ≈ 1,811, so order about 1,800–1,850. The trap is using the actual brick size 190 × 90 × 90 without the mortar joint.
Traps
Confusing plinth with foundation; omitting DPC continuity; using a 115 mm wall where 230 mm is required; forgetting lintel bearing; and calculating bricks without mortar.