Residential Metal Roof Roof Snow Load Chart

Length of roof upwind of the snow drift.

Residential metal roof roof snow load chart.

Ground snow load value. 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. Length of high roof lu. Therefore the sloped roof snow load p s would most often be equal to the flat roof snow load p f.

P s c s p f the thermal factor c t from table e 3 determines if a roof is cold or warm slippery surface values shall be used only where the roof s surface is unobstructed and sufficient space is. Consult local building codes for snow load capacity and reference the span tables for joists and rafters published by the american wood council awc as a general rule roofs that have a high human occupancy rate should be framed with rafters every 16. Drifting snow can strain one section of roof while a heavy wet snow can create pressure on the entire. From eave to ridge w.

Depending on the region of the us you can expect snow loads of zero to 100 pounds per square foot. Exceeds a 7 on 12 pitch pursuant to figure 7 2 of asce 7. Horizontal distance from eave to ridge. In most cases for residential buildings the design snow load is substantially less than the prescriptive gsl determined from rcnys table r301 2 1.

On multiple factors including. Loads increase on roofs as fresh snow becomes packed and new snow falls. Figure 7 1 pages 84 85 and table 7 1 page 92. Metal buildings are sturdy durable structures designed to withstand wind loads and other extreme weather events but you must pay special attention to potential snow loads that could accumulate.

Ground snow load pg. Roof snow load is defined as the weight of snow on the roof surface used in design of the building structure ibc 2012. Length of low roof ll. It is determined based.

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. Your roof may be supporting 60 pounds per square foot of roof when snow and ice accumulate on the surface. There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12. Length of roof downwind of the snow drift.

There are also factors such as deflection elasticity and wood species that come in to play. Discount that actual snow loads may exceed them only that the risk of snow load induced failure is reduced to an acceptably low level. You could also opt for a pvc flat roofing membrane. 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.

So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum.