Flat Roof Live Load Uk

The standard guide in the u s the asce 7 05 lists weights and stresses for all building materials expressed in pounds per square foot.

Flat roof live load uk.

Flat roof construction for residential. 0 9d 1 0e effect or 0 9 when resisting the load when permanent. The live load on a roof is the weight of any temporary objects on the roof. A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal.

A flat roof usually consists of the following. Minimum uniformly distributed live loads adapted from sei asce 7 10. Waterproof membrane to prevent water penetrating the structure and interior of the. Ordinary flat pitched and curved roofs and awnings and canopies other than of fabric construction supported by a skeleton structure are permitted to be designed for a reduced uniformly distributed roof live load l r as specified in the following equations or other controlling combinations of loads as specified in section 1605 whichever produces the greater load effect.

0 9d 1 0w a load factor of 1 6 when adding to load 7. Where snow isn t a problem the live load can come from people working on the roof and any equipment they take on to the. 1 2d 1 0e l 0 2s when h loads are present they shall have 6. 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.

Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. Roofs of buildings used for promenade or incidental assembly purposes shall be designed for a minimum load of 400 kg m2 4 kn m2 or heavier it required. Standard loads for structural calculations in residential properties. Live loads on roofs table 1 3 gives lives loads on flat roofs sloping roofs and curved roofs.

Calculating the load on a flat roof is a challenging task for the layperson that involves knowledge of building materials their weights and local building codes. Standard loads of materials. Step 4 determine the flat roof snow load.