What materials can subflooring be made of?

Subflooring is a crucial component in building construction, providing a stable foundation for the finished flooring above. It needs to be durable, capable of supporting loads, and resistant to moisture. The correct answer identifies concrete, plywood, and steel as suitable materials for subflooring because they meet these essential criteria.

Concrete is frequently used for subfloors in areas where moisture is a concern, such as basements or in situations where a strong, solid base is needed. Plywood is a common choice due to its excellent strength-to-weight ratio, versatility, and ability to be easily cut and shaped to fit various layouts. Steel may be employed in renovation or commercial projects where additional support is required or where creating a fire-resistant structure is particularly important.

The other options present materials that either lack the necessary strength or durability for effective subflooring or are not commonly used in this capacity. For instance, glass and vinyl do not provide the structural integrity needed, while brick, tile, and fabric are not practical or standard materials for subflooring. Lastly, concrete, cardboard, and foam includes cardboard, which does not possess the required strength or moisture resistance for subfloor applications.