Roof Live Load Reduction Calculator

L r l o r 1 r 2.

Roof live load reduction calculator.

In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing. Loads should be determined in accordance with this chapter. Enter the information requested like the rise and the roof ground snow load for your city exposure roof type etc. The requirement is presented in asce 7 05 4 9.

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. It s quite easy to find one online. Then follow the instructions. The live loads for members supporting two or more floors are permitted to be reduced by a maximum of 20 percent but the live load shall not be less than l as calculated in section 1607 10 1.

Roofs are under a lot of pressure. 2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes. For uses other than storage where approved additional live load reductions shall be permitted where shown by the registered design professional that a rational approach has been used and that such. 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 see section 1607 13 2 for reductions in minimum roof.

After that you ll need to use a snow load calculator. Load limits on the roof of a building. Roof live load reduction. Roof live load reduction.

Online snow load calculator for buildings with flat or low slope roofs for balanced snow drift and rain on snow surcharge loadings calculator asce 7 05 for structural engineers construction professionals and building planners. Where d is floor dead load. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. The calculator will tell you the pounds per square foot of snow.

Roof live load may be reduced by the following equation. Where l r shall not be less than 12 psf and not more than 20 psf.