How much does snow weigh on a roof.
Snow on roof weight.
Rain sleet and ice add to the.
For in depth information on this topic please see the links available on our page snow issues and roofs.
All numbers are approximate.
The critical factor with the roof collapsing and damaging is the weight of the snow and not the depth of the snow on your roof.
On average two feet of snow can equal up to 19 tons of weight on your roof which can significantly weaken the structure.
Roof collapse due to overloading by snow is a primary concern of people looking up the weight 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.
But usually the buildings that are collapsing from snow are usually outbuildings with flat roofs and collapse due to.
Psf pounds per square foot.
Here are a few examples of the weight of snow on a roof.
Fresh light and fluffy snow will weight much less than the dense packed or wet variety.
For any rafter the portion of the roof deck that transfers this load is the tributary area.
1 foot of snow on the roof 8 000 lbs 4 tons 7 psf 2 feet of snow on the roof 16 000 lbs 8 tons 14 psf 3 feet of snow on the roof 24 000 lbs 12 tons 21 psf.
Snow which is just frozen ice crystals varies in weight by its volume and density.
Snow loading is the downward force exerted on structures by the weight of accumulated snow.
A roof in an older building may be underbuilt and therefore more vulnerable to structural problems.
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.
The roof of any building is the area subject to the greatest weight temperature and moisture extremes.
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.
Consider removing accumulated snow from your roof to avoid collapse.
28 40 light fluffy snow.