Roof Live Load Reductino

When should i shovel snow off my roof.

Roof live load reductino.

Where snow isn t a problem the live load can come from people working on the roof and any equipment they. 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. L r l o r 1 r 2. 1603 1 2 roof live load the roof live load used in the design shall be indicated for roof areas section 1607 13.

Use of live load reduction in accordance with section 1607 11 shall be indicated for each type of live load used in the design. R 1 1 for a t less than or equal to 200 psf r 1 1 2 0 001 a t for between 200 psf and 600 psf. Roof live load reduction. What is the weight of the snow covering my house.

The building codes allow for a roof live load reduction for tributary area and roof slope. The live load on a roof is the weight of any temporary objects on the roof. 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. Where l r shall not be less than 12 psf and not more than 20 psf.

Roof live load may be reduced by the following equation. R 1 0 6. Hence the magnitude of the roof live loads should be specified as for a flat roof and the program allowed to make the reduction based on the slope of the framing. Likewise roof live loads in the hong kong building regulation can be reduced as a function of the slope.

The equation in the ibc is lr lor1r2. Find the answers to these questions with our snow load calculator. R1 is for tributary area above 200 sq. Snow load is different than roof live load.