Flat Roof Live Load Uk

Standard loads for structural calculations in residential properties.

Flat roof live load uk. Step 4 determine the flat roof snow load. Estimate the total weight of snow in your garden by multiplying the size of the area in square metres by the snow load. The roof should be tied down to the structure to stop it from lifting in times of strong winds. 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.

Environmental loads such as snow water and wind loads should be calculated in accordance with bs en 1991. Dead loads from the self weight of the roof construction. The minimum live loads per square meter area for different types of structures are given in is 875 part 2 1987. 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.

The loads weights to be supported are from various sources. Live loads should be suitably calculated or assumed by the designer based on occupancy levels. 500 times 1 25 yields 625 kg 1 378 lb of snow. 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.

For ground snow loads greater than 20 pounds per square foot the roof load is equal to. Schedule of permanent loads commonly found in residential properties. It is one of the major loads in structural design. A person needing to access the roof in order to repair items.

Use this same calculation to find the total weight of snow on a flat roof. Roof snow load calculation. 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 example using a 25 by 20 metre garden.

Flat roofs shall be designed to carry all imposed and dead loads acting on the structure of the roof. Flat roof structure. Span configuration and load conditions. 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.

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. Wind snow and rain. Standard loads of materials. This would include tiles battens felt insulation etc.