Minimum Roof Dead Load

The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.

Minimum roof dead load.

Dead load of roof of wood shingle construction 10 lbs. Dead load of attic floor when floored 20 lbs. Minimum roof live load is 30psf. The minimum recommended camber for roofs is an amount equal to 1 5 times the dead load deflection.

Dead loads are due to self weight of the structure. Dead loads are the permanent loads which are always present. County amendment d snow loads. Used but they typically defined the load cases or combination stress or strength limits and deflection limits.

Live load on attic floor local requirements. Dead loads includes the self weight of walls floors beams columns etc. Design stresses and deflection should be increased by a magnification factor for wood members that are not cambered such as sawn lumber and timbers. A clay tiled roof may have a dead load.

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Load types loads used in design load equations are given letters by type. V earthquake loads dead loads. And also the permanent fixtures present in the structure.

Minimum roof dead load per ibc cbc jayrod12 structural 6 jul 16 19 24 personally i don t go lower than 15 psf for any roof unless i have accurate information regarding the existing roof construction and i need to sharpen my pencil to get an existing condition to work. Where uniform roof live loads are reduced to less than 20 psf 0 96 kn m 2 in accordance with section 1607 13 2 1 and are applied to the design of structural members arranged so as to create continuity the reduced roof live load shall be applied to adjacent spans or to alternate spans whichever produces the most unfavorable load effect. B any special additional superimposed dead load if applicable. Section 1603 1 3 ground snow load pg minimum ground snow load shall be 30 psf county amendment minimum flat roof snow load pf if applicable.

When used for storage only dead load of attic floor not floored 10 lbs. D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load. The load increases with the use of heavier roofing material. The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot.

The values for dead loads in table 3 2 are for commonly used materials and constructions in light frame residential buildings.