Roof Load Width Flat Roof

You can enter this value either as a ratio x 12 or as an angle whichever suits you better.

Roof load width flat roof.

Lo unreduced roof live load per square foot m 2 of horizontal projection supported by the member see table 1607 1. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. If your roof is pitched enter the length and width of the flat area covered by the roof. Flat roofs should be constructed to provide protection from wind uplift this can be achieved by either being sufficient weight to prevent lifting or by fixing the joists to the wall plates and securing the wall plate with vertical holding down straps at least 1m long and 30mm x 2 5mm in cross section at 2 0m centres.

There are several variables to consider when determining the proper rafter size. Calculate the carport roof load using a combination of the dead load and live load measurements. This sizing guide for roof rafters will help determine what you need for your small project. Lr reduced roof live load per square foot m 2 of horizontal projection supported by the member.

Length and width of your roof. 0 58 lr 0 96. Step 4 determine the flat roof snow load. Intuitively this is the number of inches of snow on your roof in the place where the cover is the thickest.

For ground snow loads greater than 20 pounds per square foot the roof load is equal to. For roofs that are flat and with ground snow loads lower than 20 pounds per square foot the roof snow load is equal to 70 of the product of the exposure thermal and importance factors and the ground snow load.