Actual load due to snow will depend upon the shape of the roof and its capacity to retain the snow and each case shall be treated on its own merits.
Snow load on roof trusses.
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.
You can enter these values in any units you d like including meters and feet.
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.
Medeek design assumes no liability or loss for any designs presented and does not guarantee fitness for use.
The top chord live load tcll of any roof trusses will be the greater of pr or lr.
Lengthand widthof your roof.
Dol can play a part in some snow areas where the building official bo has made the determination snow will remain upon the roof for extended time periods.
The information provided here is not intended to replace truss drawings.
The snow load calculations provided by this online tool are for educational and illustrative purposes only.
If a roof is subjected to snow load it should be designed for the actual loads due to snow or for the live loads specified above whichever is more severe.
Overestimation of snow loads can unnecessarily increase the cost of construction.
These factors account for variables such as site exposure building importance roof slope and the thermal properties of the roof.
This web based application is made freely available courtesy of the advertisements displayed on this page.
To calculate the weight of snow on a roof use the first two sections of our snow load calculator.
You need to supply the following information.
The current snow load criteria irc 2012 2015 r301 2 3 irc 2012 2015 figure r301 2 5 ibc 2012 2015 1608 begins with a base value i e.
Ground snow load to which several modification factors are applied.
Duration of load dol for snow is typically 1 15.
The truss could be designed based on the assumption that the 25 psf roof snow load is a factored ground snow load in which case a ground snow load is back calculated using asce 7 based on the specified roof snow load pg 25 psf therein lies the problem with specifying only a roof snow load.
Engineered truss drawings should be obtained for specific site locations incorporating specific snow load wind speed eave wall height building length and importance factor use of building.
Live loads include wind precipitation foot traffic and all other weight that comes and goes.
Trusses are designed to carry two types of loads.
Live loads and dead loads.
A live load is a temporary load that puts stress on the structure.
