Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
How far apart are studs in a flat roof.
How to find a ceiling joist.
If the roof is not completely square you can decrease the space between joists but never increase the space.
The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the roof.
When starting to space out the roof joists always start at the end of the roof.
Ceiling joists are usually installed either 16 or 24 inches on center which means roughly 16 or 24 inches apart.
Measure from the ends.
Once you ve located the first one the others are.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.