Snow load thickness density.
Snow on roof weight distribution.
Once you know these values our snow load calculator automatically finds the total weight of snow on your roof.
S 1 25 p where s is the number of inches of snow on your roof and p is the pounds per square foot of that snow.
Additionally if snow falls unevenly on the roof then of course the weight distribution of the accumulation is going to be uneven which poses and even greater risk.
Per square foot of roof space so anything more than 2 feet of snow could be too much for your roof to handle.
Step 4 determine 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.
Two feet of snow on a roof with a footprint of say 28 40 feet could weigh 45 000 pounds.
3 5 inches of old snow is equal to one inch of water or about 5 lbs.
Wind exposure of roof.
When designing and building a new roof you should give consideration to any face of the of the home that s going to be sheltered from the wind or precipitation as this can impact the distribution of roof snow load as it accumulates.
The live load on a roof is the weight of any temporary objects on the roof.
If you want to calculate these values by hand use the following formulas.
It is determined based.
Importance occupancy and use of the building.
One inch of snow may weigh anywhere from one quarter pound per square foot to one and three quarter pounds per square foot.
Consider removing accumulated snow from your roof to avoid collapse.
Only one inch of ice weighs in at just under five pounds per square foot almost five times an average snow s weight.
Per square foot of roof space which is beyond the typical snow load capacity of most roofs.
How much snow can a roof hold.
Where snow isn t a problem the live load can come from people working on the roof and any equipment they take on to the.
A cubic foot of snow can weigh about 7 pounds if it s dry and fluffy.
It could weigh over 20 pounds if it s wet and compacted.
That s more than 22 tons.
On multiple factors including.
All these variants create a challenge for determining safe snow loads.
Wet snow can be nearly three times heavier than dry fluffy snow.
On average two feet of snow can equal up to 19 tons of weight on your roof which can significantly weaken the structure.
You can also find the load per square meter or square foot of roofing by opening the advanced mode.
Ground snow load value.
For ground snow loads greater than 20 pounds per square foot the roof load is equal to.
