Roof Live Load Requirements

The roof structure should be assessed and verified to determine if.

Roof live load requirements.

1 2d 1 0w l 0 5 l r or s or r 5. Victor staley a building official in the town of brewster mass responds. Snow typically applied to exposed roofs or decks ground snow load commonly 10 psf usually roof live load governs unless snow drifts are considered frost heave condition where soil under footing freezes and exerts upward movement on the foundation bottom of footings must be below frost depth to avoid this issue commonly 12 inches in the charlotte and surrounding areas refer to ibc for exact values. 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.

Roof connection details roof live load engineered framing specs details for fired rated structural elements flood hazard requirements base flood elevation certification flood proofing damp proofing. This issue of live load vs. 1 2d 1 0e l 0 2s when h loads are present they shall have 6. The addition of an extra layer of roof cover or the change of a light weight roof cover to a heavier one will result in an increase in the dead load on the roof structure.

Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states. The roof must be able to support the sum of its dead load and any anticipated live load so the roof has to be designed with a load limit that takes into account both of these loads. 0 9d 1 0e effect or 0 9 when resisting the load when permanent. Or s or r included with the same load factor as 3.

Where uniform roof live loads are reduced to less than 20 psf 0 96 kn m2 in accordance with section 1607 12 2 1 and are applied to the design of structural members arranged so as to create continulty the reduced roof live load shall be applied to adjacent spans or to alternate spans whichever produces the most unfavorable load effect. 1 1 3 dead load live load. The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated. Minimum requirements for roof assemblies are found in chapter 15 of the ibc.

1 2d 1 6 l r or s or r l or 0 5w dead load d in 1 through 5 and 7. The nature of roof live load is different from that of floor live load so the approach to reducing roof live load is different from that used for floor live load.