262 Section 2 Foundations and Framing 21. If the joist spacing is 24″ O.C. and there are no floor openings, how many joists are needed? 22. What is the total length of header or rim joist needed for the floor frame? 23. How many sheets of 4′ × 8′ sheathing are needed for the subfloor? (Assume no floor openings and no extra sheathing for waste.) Extending Your Knowledge 1. Obtain a set of architectural plans for a house with a conventional basement. Study the methods of construction specified in the section and detailed drawings. Then, prepare a first-floor framing plan. Start by tracing the foundation walls and supports shown in the basement or foundation plan and then add all joists, headers, and other framing members. Your drawing should be similar to the partial drawing shown in Figure 10-31. 2. Research the advantages and disadvantages of using different types of floor joists for residential construction. Compare solid dimension lumber joists, open-web trusses, and I-joists. Consider ease of installation, material cost, strength-for-size, and other factors such as ease of installing plumbing and heating lines. Academic and STEM Activities 1. Mathematics. Working from a set of architectural plans for a single-story house, develop a list of materials required to frame the floor. Select the type of subflooring (if not specified) and estimate the amount of material needed. Check material prices at several local sources, such as home improvement centers or lumberyards, and prepare a cost estimate. If the prices significantly differ among the sources, prepare a high estimate and a low estimate. 2. Language Arts. From the local building code in your area, find the requirements for floor framing. Prepare a list of the requirements along with sketches to clarify complicated written descriptions. Make an oral report to your class and pass around your sketches. Communicating about Carpentry 1. Speaking and Listening. Divide into groups of four or five students. Using your textbook as a starting point, research your topic and prepare a report on how to install platform floor framing. As a group, deliver your presentation to the rest of the class. Take notes while other students give their reports. Ask questions about any details that you would like clarified. 2. Speaking. Pick a figure in this chapter. Working with a partner, tell and retell the important information being conveyed by that figure. Through your collaboration, develop what you and your partner believe is the most interesting verbal description of the importance of the chosen figure. Present your narration to the class. 3. Speaking. Obtain (or draw) a floor framing assembly. Label the areas on the assembly where these types of components are located: joists, sills, anchor straps, anchor bolts, joists, openings in the framing, and bridging. Be prepared to explain the purpose of each component. Copyright Goodheart-Willcox Co., Inc.