Chapter 9. Construction and Building Basics

Stages of a building project: design and permits, site preparation, foundations, structure, services (water, drainage, electrical), finishing and handover [16].

Foundations and concrete. Foundations transfer a building’s weight to the ground. Concrete is a mixture of cement, sand, aggregate (gravel or crushed stone) and water. It gains strength by curing, a chemical process that needs moisture, so keep concrete damp and protected during its early days. Reinforced concrete uses steel bars to resist tension [16].

Masonry. Bricks and blocks are laid in courses with mortar, using a line and level to keep walls straight and plumb, and bonded so that joints do not line up vertically.

Structure and carpentry. Walls, floors and roofs are framed in timber, steel or concrete. Roof trusses and beams carry loads to walls and columns. Check that frames are square, level and plumb.

Plumbing basics. Supply pipes carry water under pressure; drainage works by gravity and needs a slope and traps to block odours. Common pipe materials include copper, PVC, polyethylene and galvanized steel. Test joints for leaks before closing walls [16].

Electrical in buildings. Circuits are protected by breakers and earthed, and installation must follow codes and be done by qualified electricians.

Finishes: plastering, tiling, painting, ceilings, doors and windows.

Site safety. Hard hats, safety boots and high-visibility clothing; safe scaffolding and ladders; protection against falls; trench support; safe handling of tools and materials [5][16].

Estimating materials. For a rectangular floor, area = length × width. Add an allowance (often about 5–10%) for cutting waste.

Review: How many 0.5 m × 0.5 m tiles are needed for a 4 m × 5 m floor, with 10% waste? (Answer: 20 m² ÷ 0.25 m² = 80 tiles; 80 × 1.10 = 88 tiles.)