Some Typical Loads, in Pounds per Square Foot (PSF)

Note: this is the dead load. With conventional (non­earth) roofing, the dead load is included in the rafter span tables. Thus, if you are looking at a table for rafters for a zone of 70-pound snow load, the

20 PSF 30 PSF 40 PSF 10 to 100 PSF 10 PSF per inch 10 PSF per inch 7-10 PSF* About 15 PSF*

dead load is also factored into the table. With heavy frames, such as for earth roof construction, it is better to add the dead load to everything else.