Roof Load Width Flat Roof

You can enter these values in any units you d like including meters and feet.

Roof load width flat roof.

Roof loads are used to determine the size of beams joists and columns that support a roof. 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. You can enter this value either as a ratio x 12 or as an angle whichever suits you better. The dead load consists of the actual weight of materials that comprise the roof plus any fixed equipment that the roof supports.

Lr reduced roof live load per square foot m 2 of horizontal projection supported by the member. Intuitively this is the number of inches of snow on your roof in the place where the cover is the thickest. Step 4 determine the flat roof snow load. Lo unreduced roof live load per square foot m 2 of horizontal projection supported by the member see table 1607 1.

0 58 lr 0 96. 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. This sizing guide for roof rafters will help determine what you need for your small project. Calculate the carport roof load using a combination of the dead load and live load measurements.

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.