Flat Roof Live Load Uk

Standard loads for structural calculations in residential properties.

Flat roof live load uk.

The minimum live loads per square meter area for different types of structures are given in is 875 part 2 1987. For ground snow loads greater than 20 pounds per square foot the roof load is equal to. For example using a 25 by 20 metre garden. Estimate the total weight of snow in your garden by multiplying the size of the area in square metres by the snow load.

Span configuration and load conditions. Live loads on roofs table 1 3 gives lives loads on flat roofs sloping roofs and curved roofs. Use this same calculation to find the total weight of snow on a flat roof. The roof should be tied down to the structure to stop it from lifting in times of strong winds.

Flat roofs shall be designed to carry all imposed and dead loads acting on the structure of the roof. The loads weights to be supported are from various sources. Standard loads of materials. Flat roof structure.

Live load flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load most areas exceeding 100m but not exceeding 200m excluding parts of scotland pennines north east england refer to bs 6399 3 1 kn m udl 0 9 kn point load. Dead loads from the self weight of the roof construction. Wind snow and rain. The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.

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. 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. Total load psf duration factor live load psf roof type 55 1 15 40 snow shingle 55 1 15 30 snow tile 47 30 snow 40 20 snow 1 25 20 construction or rain not snow load 55 1 15 40 snow. Roof snow load calculation.

A person needing to access the roof in order to repair items. Is 875 part ii 1987 specifies the live loads for following occupancy conditions. 500 times 1 25 yields 625 kg 1 378 lb of snow. 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.

Live loads should be suitably calculated or assumed by the designer based on occupancy levels. Step 4 determine the flat roof snow load. 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. It is one of the major loads in structural design.