Sloped Roof Snow Load Chart

To do this i use conservative too heavy dead loads and full snow loads regardless of pitch.

Sloped roof snow load chart.

It is determined based. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. If your roof is flat it is more likely to have snow load problems than if it is pitched. R802 10 2 and designed according to the minimum requirements of asce 7 10.

Discount that actual snow loads may exceed them only that the risk of snow load induced failure is reduced to an acceptably low level. The sloped roof snow load p s shall be obtained by multiplying the flat roof snow load p f by the roof slope factor c s. Consult local building codes for snow load capacity and reference the span tables for joists and rafters published by the american wood council awc as a general rule roofs that have a high human occupancy rate should be framed with rafters every 16. First figure out how deep the snow is piled up there.

Technically you should use the actual rafter length when adding up the weight of roofing materials. Roofs of steeper pitches will likely. However in my practice i typically use the horizontal run of the roof for both types of load. The flat roof snow load is calculated using formula 7 3 1.

For locations where 0 pg 20 psf all roofs with a slope w 50 with w in ft shall have a 5 psf rain on snow surcharge. Ground snow load value. I ignore the slope. Roof snow load is defined as the weight of snow on the roof surface used in design of the building structure ibc 2012.

You need to use a snow load formula for flat roofs. The easiest way is to push a yardstick into the snow on the roof selecting an area that looks typical of the overall snow depth. In our case let s assume that our structure has a flat roof roof slope 5. P s c s p f.

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. Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. On multiple factors including. For dead loads you are correct.

There are also factors such as deflection elasticity and wood species that come in to play. For the design of an actual structure a registered and licensed professional should be consulted as per irc 2012 sec.