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.
Live load roof deck chapter 16.
If a balcony over 100 sf can be designed for residential live 40 psf and a balcony 100 sf is designed for 60 psf it follows the roof deck should be the same i e.
A load factor of 1 0 is used to determine the maximum effects.
A smaller area is liable to have a higher live load than the regular residential floor live 40 psf.
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 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.
1603 1 3 roof snow load.
For roofs this exception only applies when the metal sheets have no roof covering.
Roof live load l r is defined as roof live load of 20 psf or less.
Earthquake and wind load effects are an exception to this.
Ibc provides a different definition for live load and roof live load in chapter 16 compared to that given in asce 7 chapter 4.
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.
1603 1 2 roof live load.
The roof and snow live loads used in the design shall be indicated for roof areas section 1607 12 and 1608.
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.
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.
Live load reduction of the uniformly distributed floor live loads if used in the design shall be indicated.
The ground snow load pg shall be indicated.
Roof snow load data.
1603 1 3 roof snow load data.
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 ground snow load p g shall be indicated.
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.
The roof live load used in the design shall be indicated for roof areas 1607 11.
