The unit for wind pressure is pounds per square foot psf.
Wind load lb square foot on roof.
In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant.
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.
This is highly regional as weights of snow for example range from 10 to 300 pounds per square foot based on moisture and volume of the snow.
This is all of the natural stresses imposed upon a roof such as snow loads rain loads and wind loads.
The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot.
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.
Load type span in feet 1 span 2 span 1 span 2 span 3 span 4 span 4 span load type allowable uniform loads in pounds per square foot span in feet 1 span 2 span 3 span the engineering data contained herein is for the expressed use of customers and design professionals.
The north zone design live load equates to 40 pounds per square foot the middle zone equates to 30 pounds per square foot and the south zone equates to 20 pounds per square foot.
Negative wind load 93 75 52 73 33 75 23 44 17 22 13 18 10 42.
All loads are listed as pounds per square foot of horizontal projection footprint area.
If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow.
Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched.
This edit box is used to define the wind load for the building or shape.
See figure 1 headers.
A clay tiled roof may have a dead.
An alternative to calculating wind pressure at a particular wind speed is to use the standard for various wind zones.
For example if the wind speed is 70 mph the wind pressure is 0 00256 x 70 2 12 5 psf.
Determine the transient load of the roof.
The load increases with the use of heavier roofing material.
This load can be measured in miles per hour english speed or velocity or pounds per square foot english pressure based on the corresponding radio button selected.
Snow load thickness density.
You can also find the load per square meter or square foot of roofing by opening the advanced mode.
If you want to calculate these values by hand use the following formulas.
When building a structure it is important to calculate wind load to ensure that the structure can withstand high winds especially if the building is located in an area known for inclement weather.
