Snow Weight On Flat Roof

Ice and snow will typically accumulate more quickly on low slope and flat roofs.

Snow weight on flat roof.

Two feet of old snow and two feet of new snow could weigh as much as 60 lbs. Length and width of your roof. The roof deck collects the snow load and transfers the weight to the rafters. Per square foot of roof space so anything more than 2 feet of snow could be too much for your roof to handle.

You can enter these values in any units you d like including meters and feet. As snow falls it can accumulate on your flat roof putting unnecessary weight on the structure. You need to supply the following information. For any rafter the portion of the roof deck that transfers this load is the tributary area.

Per square foot of roof space which is beyond the typical snow load capacity of most roofs. Flat roofs may be especially vulnerable to roof collapse depending on its engineered design load. This down bearing pressure can cause the roof to bow and result in ponding under the roof structure. Local building codes dictate the snow load required for residential roofs.

Estimate the weight of snow on your roof. What s the weight of snow on a roof. If your roof is pitched enter the length and width of the flat area covered by the roof. Estimate how much weight your roof can support.

House roofs should support 20 lbs square foot of snow before they become stressed. Damages snow causes to flat roofs ponding bowing. Contact your local building code department to determine the snow load requirements for your area. Snow won t slide off.

Since snow falls at slow steady speeds large quantities of snow can fall on the roof resulting in bowing. That s more than 22 tons.