Snow Load On Roof Uk

A person needing to access the roof in order to repair items.

Snow load on roof uk.

The loads weights to be supported are from various sources. And imposed loads on buildings. The uniformly distributed snow loading on the roof is obtained by multiplying the ground snow load by the appropriate snow load shape coefficient see section 5 3 of bs en 1991 1 3 and annex b of bs en1991 1 3. Measure the horizontal distance from eaves to the ridge the point where the roof is tallest and record the result labelled as run for example consider a roof with a run of 12 2 metres 40 feet.

Thus snow weighing 10 pounds per cubic foot and at a depth of 18 inches on a roof is exerting 15 pounds of pressure per square foot. Typically for the uk the average design wind load is 1200 n m2 and the snow load 600n m2 however using the average may cause the glass to be over specified or even worse underspecified for the task. Flat roof snow loads p f. Rain load s r.

Roof snow load nbc 2010 roof snow load nbc 2010 version 0 1 0 september 6 2020. For low rise buildings an abbreviated method is in bs6262 3 2005. This would include tiles battens felt insulation etc. The design wind load can be calculated using bs6399 2.

Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. You can shovel out a cubic foot of snow from the roof place it in a container and quickly weight it on a scale. Importance factor i s. Then measure the depth of snow on the roof and multiply it by the weight of a cubic foot of that snow.

The scope of bs en 1991 1 3 is limited to snow loads only c in accordance with clause 3 3 2 1 of bs en 1991 1 1 roofs of buildings particularly domestic roofs where the allowed imposed loads cover maintenance only imposed loads need not be considered to act simultaneously with snow loads and or wind actions. 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. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. Obtain the recorded snow load the maximum load expected to accumulate on the ground for your area.

Ground snow load s s. For ground snow loads greater than 20 pounds per square foot the roof load is equal to 70 of the product of the exposure thermal and importance factors the ground snow load and 20 pounds. The roof should be tied down to the structure to stop it from lifting in times of strong winds.