Posted by Billy NY on February 13, 2015 at 05:05:02 from (104.228.35.235):
In Reply to: roofs are collapsing posted by Geo-TH,In on February 13, 2015 at 04:49:54:
There should be redundancy in the snow loading or in the design/construction, if its a possibility, or you had best get some or all of that snow off the roof. Trust me when I tell you, especially with the barn I posted some photos of, this is no fun task, that one you had best stand on the truss top chord, or risk going through, given the old perlins.
I'm not up to date or familiar with the existing snow loading and wood framed structure, but in this area, one would be smart to increase the safety margin on the design/construction of most any structure.
The sad thing about this is that when you get significant accumulations, more than likely you have ample time to remove it or at least lessen the load by removing some of it before it turns granular, hardens up and becomes monolithic.
Our old barns survived snow loads as I recall way back when in the early 70's that exceed any accumulations I have seen since, one was mortise and tenon with thick lumber for roof framing, the other a little more modern with what I believe was actual, not nominal lumber,(modern framing lumber). They knew how to build them way back when.
I can't say I could state how it works engineering wise, but I cannot see any poles supporting a pole barn roof, being further driven into the earth around here, way too much resistance, maybe soft ground ? There would have to be a concentrated point load and if that was so, the roof framing will fail first as I see it.
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