Live Load Roof Deck Chapter 16

Roof snow load data.

Live load roof deck chapter 16.

A smaller area is liable to have a higher live load than the regular residential floor live 40 psf. The ground snow load pg shall be indicated. Earthquake and wind load effects are an exception to this. For roofs this exception only applies when the metal sheets have no roof covering.

The roof and snow live loads used in the design shall be indicated for roof areas section 1607 12 and 1608. Roof live load l r is defined as roof live load of 20 psf or less. A load factor of 1 0 is used to determine the maximum effects. The ground snow load pg shall be indicated.

Ibc provides a different definition for live load and roof live load in chapter 16 compared to that given in asce 7 chapter 4. 1603 1 3 roof snow load data. Ibc 2012 defines live load l as roof live load greater than 20 psf and floor live load. The roof and snow live loads used in the design shall be indicated for roof areas sections 1607 12 and 1608.

So with the roof dance floor example per ibc the live load would not be roof live load but live load assuming the live load magnitude exceeded 20 psf. On a roof with a slope greater than 4 to 12 the live load limit is typically adjusted downward from 20 psf to 15 psf to allow for the relatively greater dead load on the steeper roof. In areas where the ground snow load pg exceeds 10 pounds per square foot psf 0 479 kn m2 the following additional information shall also be provided regardless of whether snow loads govern the design of the roof. In areas where the ground snow load pg exceeds 10 pounds per square foot psf 0 479 kn m2 the following additional information shall also be provided regardless of whether snow loads govern the design of the roof.

The roof live load used in the design shall be indicated for roof areas 1607 11. 1603 1 2 roof live load. Factored loads are determined by multiplying nominal loads that is loads specified in chapter 16 of the ibc by a load factor which is typically greater than or less than 1 0. 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.

For secondary wall members supporting formed metal siding the design wind load deflection shall not exceed l 90. Where uniform roof live loads are reduced to less than 20 psf 0 96 kn m 2 in accordance with section 1607 12 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. The ground snow load p g shall be indicated. Live load reduction of the uniformly distributed floor live loads if used in the design shall be indicated.

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.