Make an accurate estimate of the number and length of joists and headers required to construct the floor frame for a single-story rectangular building 12' wide and 32' long. Use 2 x 8 lumber spaced 16 in O.C. Assume the joists span the short dimension (12').
a) Joists: 10, Length: 12 feet, Headers: 0
b) Joists: 8, Length: 12 feet, Headers: 0
c) Joists: 12, Length: 12 feet, Headers: 1
d) Joists: 10, Length: 12 feet, Headers: 1