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 the requirement is presented in asce 7 05 4 9.
Roof live load reductino.
What is the weight of the snow covering my house.
Use of live load reduction in accordance with section 1607 11 shall be indicated for each type of live load used in the design.
Where l r shall not be less than 12 psf and not more than 20 psf.
The equation in the ibc is lr lor1r2.
R1 is for tributary area above 200 sq.
Roof live load may be reduced by the following equation.
Find the answers to these questions with our snow load calculator.
Commentary in asce 7 05 c4 about roof live load reductions explains the anticipated difference in use of roof areas vs.
R2 is a reduction factor for roof slope above 4 12.
Roof live load reduction.
When should i shovel snow off my roof.
Snow load is different than roof live load.
1603 1 3 roof snow load data.
Likewise roof live loads in the hong kong building regulation can be reduced as a function of the slope.
The live load on a roof is the weight of any temporary objects on the roof.
Where snow isn t a problem the live load can come from people working on the roof and any equipment they.
The building codes allow for a roof live load reduction for tributary area and roof slope.
1603 1 2 roof live load the roof live load used in the design shall be indicated for roof areas section 1607 13.
L r l o r 1 r 2.
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.