Final answer:
When installing lumber joists, use 16d common nails, spaced 16 inches on center for toe nailing rim joists to sill plates. Studs spaced at 16 inches apart are equivalent to 40.64 cm. If a spring stretches from 50 cm to 30 cm over the course of a day, 40% of the nails have been used.
Step-by-step explanation:
When installing lumber joists, the recommended practice is to toenail the rim joists to the sill plates using 16d common nails, spaced 16 inches on center. This method safeguards the structure by providing adequate support and stability for the floor system. It's important to follow proper building codes and regulations specific to your area when performing this task.
To answer the question related to measurement conversion, when vertical studs are placed 16.0 inches apart, that distance in centimeters is 40.64 cm (since 1 inch is equal to 2.54 centimeters).
In the scenario where a box of nails suspended from a spring indicates different stretches at the beginning and end of the day, to calculate what fraction or percentage of the nails have been used, you would subtract the end-of-day spring stretch from the start-of-day stretch, then divide by the original stretch. If the spring stretches 50 cm at the start and 30 cm at the end, the fraction of nails used is (50 - 30) / 50 = 20/50 or 40% of the nails.