The greater the space between rafters, the shorter the distance they can span. Rafter joist spacing is only one aspect of roof design and building that affects the span, along with load variables, wood species, and grade. The typical on-center spacing, according to the International Residential Building Code (IRC), is 12”, 16”, 19.2”, and 24”, which means the actual space between the rafters is 10.5”, 14.5”, 17.7”, and 22.5”. It is measured from the center of one rafter to the center of the next, also known as ‘on-center’, which makes it easier to determine the number of rafters based on the building’s length. ![]() Rafter spacing is the distance between parallel rafters or roof joists.
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