Don't Let Your Roof Collapse on Your Head!
by Stephanie Relfe B.Sc. (Sydney) & Robert Felix (www.IceAgeNow.com)
Dec 30 2008
A NORMAL ROOF LOAD IS 40 LBS/Sq. Ft.
1" of snow is 1 Lb/Sq.Ft.
THAT MEANS ANY ROOF CAN COLLAPSE AFTER JUST 40" OF SNOW!
And that’s dry snow. Most will collapse before 40” of wet snow.
Important Note from Robert Felix: I agree with Stephanie. Snow can weigh as little as 7 pounds per cubic foot, but a more average snowfall can easily weigh 15 lbs./cu. Ft.
Compacted snow can weigh 20 pounds or more.
And if it should rain, snow can act like a sponge and get heavier … fast.
So be ready to brace up your roof or have it cleared.
Source: http://wiki.answers.com/Q/How_much_does_a_cubic_foot_of_snow_weigh
Remember, snow is water. And water is heavy.
COMMENTS
*** A friend of ours had to move out of his house because the roof collapsed due to snow, about 2003. He lived in Minnesota. He was a scientist and so not a dummy. So it does happen, even with ‘normal’ snow.Stephanie Relfe.
*** Hi, Robert (www.iceagenow.com), I don't mean to pile on about roof structural limitations vis a vis snow
loads but the worst situation is a series of freeze/thaw cycles with on & off heavy snow fall. hat happened to me a few years ago. My roof is
designed specifically for harvesting rain and now melt so it's
relatively flat. In spite of the fact that the roof is as strong as
some small bridges, I got worried and went up to check on things. I
spent the rest of the day breaking up 4 - 5 inch thick ice under about
two feet of very dense, wet snow. Scary! Aram Paquin
MORE INFORMATION
Snow causing roofs to collapse all over Washington. 12/26/08 http://www.nwcn.com/statenews/washington/stories/NW_122608WAB_roof_collapse_KS.cfa6f16.html
Spokane Roofs Collapse Under Snow 12/30/08
www.weather.com has posted a number of videos lately, showing commercial buildings that collapsed from snow (12/30/08).
More Vital Infomration at WWW.ICEAGENOW.COM
PLEASE get Robert's brilliant book, "Not by Fire, but By Ice", to understand the crazy weather we are having.
Source: http://www.iceagenow.com/Do_not_let_your_roof_collapse.htm
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