How many rafters you need?

The number of rafters needed for a roofing project depends on several factors, including the roof's span, pitch, and the type of materials used. Typically, rafters are spaced 16 to 24 inches apart, so you can calculate the total number by dividing the total length of the roof by the spacing distance. Additionally, local building codes and the specific design of the roof may influence the total number required. It's best to consult with a structural engineer or a roofing professional for precise calculations.