Roof Snow Load Chart

It is determined based.

Roof snow load chart.

Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. Wind exposure of roof. On multiple factors including. If you want to calculate these values by hand use the following formulas.

You can also find the load per square meter or square foot of roofing by opening the advanced mode. Ground snow load value. 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. 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.

There are also factors such as deflection elasticity and wood species that come in to play. Find the volume of the snow on the roof the volume of snow on the roof directly relates to how much it will. The result snow load or the pressure exerted by the snow has the units of kn m or lbs ft. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load.

Roof snow load is defined as the weight of snow on the roof surface used in design of the building structure ibc 2012. Once the ground snow load at the building site is determined it must then be converted to roof snow loads according to asce 7 with appropriate treatment of exposure to wind thermal properties of the roof roof slope unbalanced snow loads drifting and risk exposure. How to calculate snow load step one. For the design of an actual structure a registered and licensed professional should be consulted as per irc 2012 sec.

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. Online snow load calculator for buildings with flat or low slope roofs for balanced snow drift and rain on snow surcharge loadings calculator asce 7 05 for structural engineers construction professionals and building planners. In our case let s assume that our structure has a flat roof roof slope 5. Once you know these values our snow load calculator automatically finds the total weight of snow on your roof.

If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. All of the load cases required to fully design an actual structure are not provided by this calculator. The flat roof snow load is calculated using formula 7 3 1. R802 10 2 and designed according to the minimum requirements of asce 7 10.

Table r301 2 1 climatic and geographic design criteria ground snow load. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. Snow load thickness density.