Willch are discussed in Unit 17) are used for the joists, they would most likely span the full width of the floor and rest on top of the girder, because I-joists are available in greater lengths than dimensional lumber. Assignment Questions 1 through 5 refer to Figure 16-8. Questions 6 through 9 refer to Figure 16-9. 1. What is the length of the girder? 6. What is the length of the girder? 2. Describe the material used to build the girder, 7. Describe the material used to build the girder, including the size of the material. including the size of the material. 3. What supports the span of the girder? (Include 8. What supports the span of the girder? (Include material and cross-sectional size.) material and cross-sectional size.) 4. How many posts, columns, or piers support the 9. How many posts, columns, or piers support the girder? girder? 5. What is the height of the columns or piers support- 10. What is the dimension from the top of the footing ing the girder, including bearing plates? under the pier to the top of the steel beam? Columns, Piers, and Girders 113