Rafter spacing is the shortest distance between two parallel rafters measured “on-center.” Alternatively, you can determine the rafter spacing by measuring the distance between two ceiling joists on-center. Many roofers join rafter feet with ceiling joists for a more rigid structure. But more importantly, they distribute the roof load down to the walls and the foundation for a structurally sound home. First, they provide a platform for decking installation. It’s eco-friendly, energy efficient, beautiful, and easy to install. They are laid side by side in a series to provide base support for roof decks.Īlthough steel is preferred in industrial construction, dimensional lumber is the best rafter material for residential homes. Rafters are roof framing members that run from the ridge or hip of the roof to the wall plate, eave, or downslope perimeter. Generally, the smaller the rafters, the closer the spacing. The exact figure depends on many factors, including the type of roof structure, roof design (style), etc. However, you can also space your rafters 12 inches or 19.2 inches on-center. The standard rafter spacing for metal roofs is 16 or 24 inches on-center. We also briefly explain rafter spacing requirements for various structures, including porches, pergolas, and sheds. Indeed, you can be penalized if a home inspection reveals improper rafter spacing.įor this reason, we’ve developed this guide to explain rafter spacing requirements for metal roofs on residential homes. However, the opposite is true, especially for the main home. Did you know that there are standard guidelines for roof rafter spacing? Unfortunately, many DIYers think you can space them as you wish.
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