Posted by paul on February 14, 2011 at 12:12:21 from (76.77.197.242):
In Reply to: How's this work? posted by rrlund on February 14, 2011 at 09:56:48:
In addition to raw weight, time is a factor in roof colapse.
A roof truss will stress over time, bending, deflecting, stretching. It can hold the weight for a day or a week, but in 2 months, it slowly rips joints and knotty wood areas apart.
As snow melts, it moves the weight concentrating it in different places.
Put together, the same weight will bring down a roof that held it the day or week before.
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