![]() ![]() I = inches of ice buildup on the roof (depth) How to Calculate Snow Loadįiguring out how much weight snow is adding to your roof may seem tricky, but there is a calculation that allows you to accurately estimate snow load: If you have an older roof but aren’t ready to replace it, be sure to pay attention to the condition and keep up with repairs in the warmer months. Along with the deterioration of an older roof, the weight of snow that can be sustained will decrease. Freshly fallen dry snow will weigh less than old, wet snow, so it’s important to keep an eye on when snow is collecting on your roof. When temperatures drop and rain falls on top of the snow, the load becomes heavier from the added ice. Thawing and freezing can cause snow to become heavier as it gathers ice. ![]() ![]() The exception to this is on a flat roof which doesn’t allow for snow to shed and has a higher chance of ice dams forming. Metal roofs conduct heat better than asphalt roofs and allow for snow to fall off more easily. To understand the exact amount of snow that your roof can handle, contact the manufacturer or roofing company that installed the roof. The best way to estimate how much weight snow is adding to your roof is to calculate the Snow Load. Not all snow is created equal snow weight depends on the age and temperature of the snow. The amount of snow a roof can hold varies between roofing material manufacturers, but most residential roofs that are in good condition can sustain about 20 pounds per square foot of snow. Thus, if you do need to remove snow from your roof, do not remove all of the snow leave a thin layer to protect your roof from losing heat in the winter. This can protect your roof from subzero temperatures. A light layer of snow provides insulation for your house as long as it is not heavy enough to cause damage. In certain conditions, leaving snow on your roof may be a good idea. This kind of damage does not always occur when there is snow on the roof, so it is a good idea to understand how to gauge the amount of snow on your roof and whether or not it is harmful to your home. The most serious damage that can occur is a roof collapse due to too much snow accumulating on a weak or older roof. Small holes and tears in the roof can form, creating interior damage from a leaking roof and poor heat retention in the attic. Most roofing materials are designed to withstand a moderate to high amount of snow, but if the snow load exceeds the normal weight, it can cause damage. How and When to Remove Snow From Your Roof How Snow Damages Your RoofĪ heavy load of snow can cause damage to your roof and the interior of your home. ![]()
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