What type of construction is characterized by walls and structural supports made completely or partially of wood of dimensions less than heavy timber?

Lightweight construction is characterized by the use of wood for walls and structural supports, with dimensions that are smaller than those classified as heavy timber. This type of construction often employs engineered wood products and other materials that are designed to reduce weight while maintaining structural integrity.

One key aspect of lightweight construction is that it typically involves components like I-joists, laminated veneer lumber, and wooden trusses, which all contribute to a lighter overall building framework. These materials allow for more efficient design and can lead to quicker assembly times compared to heavier materials. However, it is essential to consider that while lightweight construction can offer advantages in terms of cost and speed, it also has implications for fire safety. These materials may burn more quickly than heavy timber, leading to rapid failure in the event of a fire.

In contrast, concrete construction utilizes masonry or concrete materials which are significantly heavier and have different fire-resistance characteristics. Heavy timber construction relies on larger wooden components, typically oversize and solid, designed to perform better under fire conditions due to their ability to char on the exterior while maintaining structural integrity. Steel frame construction employs steel beams and columns, which, while strong, do not align with the characteristics defined in the question regarding the use of wood. Thus, lightweight construction