Posted by Jerry/MT on February 28, 2008 at 18:58:45 from (206.183.116.129):
In Reply to: Snow loading posted by bill mart on February 28, 2008 at 14:32:32:
Realistically, walking on your roof puts a very high load on the roof. I weigh near 200 pounds and I doubt the area of my shod feet is greater than 1 sq ft total. So I reckon my load standing on the roof is close to 200 lbs/sq ft. I think a properly designed roof has more strength then the rating number implies. My roof is designed for 80 lbs/sq ft snow load and it feels very solid when I walk on it. I think these ratings are "deflection limited" ratings not ultimate strength of the roof. By that I mean that that if you take all the loads including the snow load, the maximum deflection of any structural element is no greater than say 0.25 inches.
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