Overweight Of Snow Roofing

On roof slopes between 4 12 and 6 12 rough textured roofing materials work best.

Overweight of snow roofing.

On average two feet of snow can equal up to 19 tons of weight on your roof which can significantly weaken the structure. Snow loads are influenced by elevation general weather and moisture patterns slope direction exposure roof or trail bridge configuration and wind direction and severity. 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. 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.

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. An overweight puts the structure of your roof in jeopardy and this can cause in the worst cases a complete collapse of the roof. 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. Your equation for determining snow load s x 1 25 p is fairly straightforward math.

Per square foot of roof space so anything more than 2 feet of snow could be too much for your roof to handle. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. Consider removing accumulated snow from your roof to avoid collapse. When the snow melts it creates layers of ice so this overweight of snow and ice can have serious repercussions on the condition of your roof.

Overestimation of snow loads can unnecessarily increase the cost of construction. Two feet of old snow and two feet of new snow could weigh as much as 60 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. 3 5 inches of old snow is equal to one inch of water or about 5 lbs.

They hold the snow in place and keep it from accumulating and then sliding off in large slabs that can be dangerous. People have been killed by snow avalanches sliding off roofs during big snow winters. 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.