Final answer:
The wooden floor truss is the most common type used in residential construction due to its cost-effectiveness, versatility, and ease of installation.
Step-by-step explanation:
The most common type of floor truss used in residential construction is the wooden floor truss. Wooden floor trusses are preferred due to their cost-effectiveness, versatility in design, and ease of installation compared to other materials like steel, concrete, or aluminium.
They allow for a broad range of customizations and are suitable for various spans and loading conditions typical in residential buildings.
Additionally, wooden trusses can accommodate mechanical, electrical, and plumbing services within their design, making them highly functional for modern construction needs.
The other types of floor trusses mentioned—steel, concrete, and aluminium—are less common in residential construction due to higher costs, more complex installation processes, and in the case of concrete, the requirement of a different construction method altogether.