This will give you the kilogram per square metre psf or pounds per square foot snow load for your 3 12 pitch roof.
Weight of snow on pitched roof.
Expressing this in ratio form our sample roof has a 3 12 pitch.
Generally speaking steep and smooth roofs shed snow more easily than flat or only slightly pitched roofs.
Choose a strong durable set of shingles like asphalt or slate.
Intuitively this is the number of inches of snow on your roof in the place where the cover is the thickest.
You can enter this value either as a ratio x 12 or as an angle whichever suits you better.
On average two feet of snow can equal up to 19 tons of weight on your roof which can significantly weaken the structure.
The roof pitch affects weight distribution allowing it to hold a little more snowpack safely.
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.
Go to a snow load calculator and enter the information requested.
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 includes the ground snow load for your area terrain exposure roof type pitch and run.
So a risky roof is flat or slightly pitched and in a location that is exposed to the wind.
Shallow roofs adjacent to or below taller steeper ones are especially vulnerable to a load of snow.
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.
If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow.
Snow which is just frozen ice crystals varies in weight by its volume and density.
You may need to create a new login account to use the new calculator.
A steep roof does a much better job of handling snow than a flat roof does.
S 5 has updated the snow retention calculator to incorporate many new features including side by side comparisons for colorgard dualgard x gard 1 0 and x gard 2 0.
In addition the slope of the roof helps to dump some of that snow back on the ground removing more stress.
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.
Calculating the weight of snow is useful when you need to know the total weight it adds for example to calculate the weight on a roof.
If your roof is pitched enter the length and width of the flat area covered by the roof.
