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Re: Re: Re: Re: Re: Snow on the Pole Barn Roof ?
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Posted by jdemaris on February 04, 2004 at 19:04:11 from (209.23.31.124):
In Reply to: Re: Re: Re: Re: Snow on the Pole Barn Roof ? posted by Dave Ritenburgh on February 04, 2004 at 15:29:37:
Well, part of the reason for shoveling roofs, it's to prevent water damage from ice dams forming on the eaves. That can happen with four inches or four feet of snow. As to annual snowfall and designed roof strengh . . . rain can add to the weight, and so can drifting, so can wind loading. I've got couple of barns with gable roofs with one side facing the prevailing wind and the other on the lee side. Subsequently, much of the snow from one side drifts onto the other. Very often, one 16" snowstorm can result in almost three of snow on the roof. In additon to that is the common situation of one roof's eave ending over another lower roof. I've got six roofs like that on my farm. Do the math. All these things should be calulated variables but don't necessariy show up in the building codes. Thus the reason why modern buildings can and do come down that were built to code. Seems part of code should include maintenence, i.e. snow removal and other displays of common sense. Sometimes code seems to eradicate commons sense, since some people assume it makes buildings 100% safe in all conditions.
Highway overpasses also come down when hit in the right spot by the right truck, and houses built in 100 year flood plains sometimes get flooded two years after they're built. Codes don't prevent everything.
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