One of the most demanding (and realistic, actually!) assessments of a roof is related to its behavior in snowy conditions, because in this context all the problems that may occur during the cold season, from the weight of the deposited snow layer, to snow storms, low temperatures, ice formation etc. are taken into consideration. Also, these critical conditions reveal the vulnerable areas of the roof, which are prone to damage.
The most important factors to consider when assessing snow load on the roof are:
- The shape of the roof (the number of slopes and roof openings)
- Local weather conditions
- The thermal characteristics of the roof and the amount of heat generated under the roof
- The roughness of the roof surface, which influences the way snow slides down
The freshly fallen snow has a density ranging from 70 kg/ m3 to 150 kg/ m3, while “old” snow reaches from 200 kg/ m3 to 400 kg/ m3. There is also a phenomenon called "transparent snow", whereby the snowflakes move indefinitely, under the action of air currents, entering any space, slot or joint it finds, causing considerable damage to improperly maintained roofs.
In any case, it is recommended to take preventive measures, to avoid situations of increased snow load on both the residential and commercial roof that may clog the drainage system or destroy the roof structure. For commercial roof inspections, look to http://ultimateroofcoaters.com/chicago-commercial-roofing/.
First Seen on: Your Roof and the Weight of Winter Snow
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