The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated.
Snow load roof giude lines.
Check for loads due to snow sliding from an upper roof.
The building code identifies the ground snow load which building designers use as the starting point to calculate the uniform design snow load on a building roof.
If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow.
Check for ice dams and icicle loads.
20 s 20 where s is the spacing in feet.
Done calculate drift surcharge load.
Snow load safet guide.
This allows the snow to stay on while venting the roof system.
Superpose the drift load on the base snow load.
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.
20 ft of the roof multiply the drift load by the factor.
Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states.
P s c s p f the thermal factor c t from table e 3 determines if a roof is cold or warm slippery surface values shall be used only where the roof s surface is unobstructed and sufficient space is.
The purpose of this web site is to provide ground snow load analysis information and data gathered from all 50 states.
Each state has a listing of building code and applicable guidelines for snow loads as well as details about where the snow load information may be found or purchased.
Victor staley a building official in the town of brewster mass responds.
Roof snow loads for the following counties in pounds per square foot ground snow load will give you some idea of the wide range of specifications across the u s.
States and or local jurisdictions may amend or supplement the ibc or.
To complete this roof system snow stops or snow brackets are used to stop all snow movement.
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.
When we design homes in the mountains we pay careful attention to all the details of the building envelope to insure that the finished product will perform.
They then have the option of putting dormers on the roof without damage to the valleys penetrations lower roofs and property below due to sliding snow and ice.
See section 7 4 5 asce 7.
Purpose of this web site.
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.
Ground snow load is defined as the weight of snow on the ground.
Keep in mind that specific locations within these counties may have snow loads modified by local authorities.
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.
This issue of live load vs.
Adopt their own code.
