Overweight Of Snow Roofing

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.

Overweight of snow roofing.

Per square foot of roof space which is beyond the typical snow load capacity of most roofs. On roof slopes between 4 12 and 6 12 rough textured roofing materials work best. Your equation for determining snow load s x 1 25 p is fairly straightforward math. 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.

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. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. An overweight puts the structure of your roof in jeopardy and this can cause in the worst cases a complete collapse of the roof. Snow loads are influenced by elevation general weather and moisture patterns slope direction exposure roof or trail bridge configuration and wind direction and severity.

3 5 inches of old snow is equal to one inch of water or about 5 lbs. Being attentive to the warning signs and take measures to prevent an accumulation of snow or ice are the best means to avoid the consequences of a roof collapse. In most cases excessive snow accumulation on a roof manifests itself in more subtle ways and causes gradual damage over time instead of a sudden calamity. However many forecasters are predicting that the upcoming winter season will be unusually harsh in many parts of the u s so it s helpful to know how to identify snow damage to a roof and what to do about it.

Overestimation of snow loads can unnecessarily increase the cost of construction. On average relatively dry snow weighs around 5 pounds a foot while wet snow can tip the scales at more than 20 pounds per foot to calculate the snow load on your roof assume that every inch deep of snow equals 1 25 pounds. Consider removing accumulated snow from your roof to avoid collapse. 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.

They hold the snow in place and keep it from accumulating and then sliding off in large slabs that can be dangerous. Two feet of old snow and two feet of new snow could weigh as much as 60 lbs. On average two feet of snow can equal up to 19 tons of weight on your roof which can significantly weaken the structure.