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Over/Under on how many flat top roofs collapse with the snow

Posted on 1/20/25 at 9:02 am
Posted by ThatTahoeOverThere
Member since Nov 2021
4206 posts
Posted on 1/20/25 at 9:02 am
Snow weight ranges are anywhere from .26lbs psf for fluffy snow to 1.74lbs psf for wet snow. That means a 40x20 building will have anywhere 2000lbs to 8300lbs of snow on it. Can these builds hold up?

Snow weight calculator
Posted by Huey Lewis
BR
Member since Oct 2013
4923 posts
Posted on 1/20/25 at 9:05 am to
quote:

2000lbs to 8300lbs


I know most of our bedframes can handle that kind of weight, but roofs? That I don't know.
Posted by Jake88
Member since Apr 2005
75253 posts
Posted on 1/20/25 at 9:05 am to
What about regular pitched roofs in south Louisiana?
Posted by LSUfan4444
Member since Mar 2004
55661 posts
Posted on 1/20/25 at 9:07 am to
I'll set the total at .5, I'll take the over, you have the under.

I'll send you my venmo
This post was edited on 1/20/25 at 9:08 am
Posted by ThatTahoeOverThere
Member since Nov 2021
4206 posts
Posted on 1/20/25 at 9:10 am to
Posted by KRS
Member since Jun 2022
485 posts
Posted on 1/20/25 at 9:12 am to
Snow weighs around 20 pounds per cubic foot, or 1.25 pounds per inch of depth. However, the weight of snow can vary depending on the type of snow and its moisture content.

Light and fluffy snow: Weighs the least, about 4 pounds per square foot

Normal snow: Weighs about 6 pounds per square foot

Wet snow: Weighs the most, about 13 pounds per square foot
Posted by Shexter
Prairieville
Member since Feb 2014
16946 posts
Posted on 1/20/25 at 9:14 am to
quote:

Snow weight ranges are anywhere from .26lbs psf for fluffy snow to 1.74lbs psf for wet snow.


How on earth are they measuring snow per square foot?
At what thickness? Zero?



quote:

A cubic foot of snow weighs around 20 pounds, but the exact weight depends on the moisture content of the snow. The weight of snow can range from 1–21 pounds per cubic foot



Most flat roof are designed to hold some water.

quote:

A cubic foot of water weighs approximately 62.4 pounds
This post was edited on 1/20/25 at 9:16 am
Posted by ThatTahoeOverThere
Member since Nov 2021
4206 posts
Posted on 1/20/25 at 9:16 am to
quote:

Most flat roof are designed to hold some water.

quote:
A cubic foot of water weighs approximately 62.4 pounds


Yeah but those roofs also drain. Snow doesn't drain
Posted by Loup
Ferriday
Member since Apr 2019
14330 posts
Posted on 1/20/25 at 9:18 am to
If it starts piling up just spray it off with the hose
Posted by Shexter
Prairieville
Member since Feb 2014
16946 posts
Posted on 1/20/25 at 9:18 am to
quote:

Yeah but those roofs also drain. Snow doesn't drain


Let's say 3" of standing water

12"/4 = 3"

62.4/4 = 15.6 pounds

Posted by Tr33fiddy
Hog Jaw, Arkansas (it exists)
Member since Aug 2023
1438 posts
Posted on 1/20/25 at 10:26 am to
Your roof won't collapse but your floating swamp house may sink lol

Back in the 80s we got 20 inches of heavy wet snow and the 200 boat floating marina began to sink. A crew of teenagers had to remove the snow in such a way that it wouldn't cause the whole thing to buckle.

Teenagers were way more capable back then. The algebra nerds directed the jocks and got shite done
Posted by Dantheman504
N/A
Member since Jun 2013
4971 posts
Posted on 1/20/25 at 10:32 am to
quote:

1.74lbs psf for wet snow. That means a 40x20 building will have anywhere 2000lbs to 8300lbs


1.74lbs per sqft

40x 20 = 800 sqft

800x 1.74 = maximum of 1,392lbs

Am I stupid or missing something? That's nowhere near 2,000-8,000

Edit: It would essentially go up 1,000lbs per 1" of snow accumulated. So I guess if you have 2"-4" it can be 2,000-4,000lbs but I highly doubt we get 5"-8" on roofs for it to reach that 5,000-8,000lbs mark
This post was edited on 1/20/25 at 10:38 am
Posted by HoustonGumbeauxGuy
Member since Jul 2011
31594 posts
Posted on 1/20/25 at 10:33 am to
Posted by Giantkiller
the internet.
Member since Sep 2007
23452 posts
Posted on 1/20/25 at 10:35 am to
I think this may be the biggest overreaction to any weather event I’ve ever seen.
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