Snow Loading Flat Roof Uk

Minimum flat roof snow load values.

Snow loading flat roof uk.

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. A person needing to access the roof in order to repair items. Until march 2010 the code of practice for snow loading in the uk was bs 6399 3 but this has since been replaced by bs en 1991 1 3 although the former is still widely used the latter standard is one of the structural eurocodes and is applicable across the european union although each member state has its own national annex that must be used when designing for that country. The flat roof snow load is calculated using formula 7 3 1.

If you live in the us our snow load calculator compares the total weight on your roof with the permissible load calculated according to the standards issued by the american society of civil engineers regarding the minimum design loads for buildings and other structures asce7 16. Estimate the total weight of snow in your garden by multiplying the size of the area in square metres by the snow load. In regions with relatively low snow load values the load from a single event may result in the peak loading. 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.

To figure out the load on your roof take the depth of snow in feet and multiply it by the weight of a cubic foot of snow. As a result equation 7 1 which accounts for loss between events will result in a non conservative value. In our case let s assume that our structure has a flat roof roof slope 5. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load.

A great deal of confusion currently exists among engineers architects recreation specialists and maintenance personnel concerning the proper snow loading to use for the design and maintenance of trail bridges building roofs and other structures in mountainous high snow load areas. If the snow weighs 10 pounds per cubic foot and there are 1 5 feet on the roof each square foot of the roof is getting 15 pounds of pressure. The roof should be tied down to the structure to stop it from lifting in times of strong winds. Why snow load information.

Wind snow and rain. Asce 7 05 equation 7 1 assumes that the snow load results from multiple events. 500 times 1 25 yields 625 kg 1 378 lb of snow. If you have any concerns as you are determining your flat roof snow load consult with a structural engineer or roofing specialist.

For example using a 25 by 20 metre garden. Roof snow load calculation. This would include tiles battens felt insulation etc. The loads weights to be supported are from various sources.