Metal carports

[timwinters]

8" -41 lbs PSF... snow load...

Ummm...8" of water = 41#...not 8" of snow.

Snow is anywhere from 5#/CF for light fluffy snow to 20#/CF for a wet, heavy, saturated snow that's been on the roof for a while and gone through numerous thermal cycles.

But that wet, heavy, saturated snow started out being a larger volume.

Fresh fallen snow, ranges from 6" to 12" per inch of rain. That's 5 to 10 lb/cf.

6" being an extremely wet, heavy snow.

Back East it can get down to one in three.....

Not unless it's mixed with sleet/freezing rain.

 

[N801BH]

Ummm...8" of water = 41#...not 8" of snow.

Snow is anywhere from 5#/CF for light fluffy snow to 20#/CF for a wet, heavy, saturated snow that's been on the roof for a while and gone through numerous thermal cycles.

But that wet, heavy, saturated snow started out being a larger volume.

Fresh fallen snow, ranges from 6" to 12" per inch of rain. That's 5 to 10 lb/cf.

6" being an extremely wet, heavy snow.



Not unless it's mixed with sleet/freezing rain.

Explain this...

http://www.pilotsofamerica.com/forum/showthread.php?t=89739


...........

 

[timwinters]

What's there to explain? An old hanger, maybe not properly maintained, maybe some rotting wood, maybe some unauthorized and/or unwise changes to the structure over the years. Who knows? ( maybe the locals do by now.)

Everything I quoted was simple data that you can easily find on the internet or in structural design books.

 

[N801BH]

What's there to explain? An old hanger, maybe not properly maintained, maybe some rotting wood, maybe some unauthorized and/or unwise changes to the structure over the years. Who knows? ( maybe the locals do by now.)

Everything I quoted was simple data that you can easily find on the internet or in structural design books.

Your figures show CUBIC feet... Not Square feet...

 

[N801BH]

What's there to explain? An old hanger, maybe not properly maintained, maybe some rotting wood, maybe some unauthorized and/or unwise changes to the structure over the years. Who knows? ( maybe the locals do by now.)

Everything I quoted was simple data that you can easily find on the internet or in structural design books.

So.. In your expert estimation.....

How much snow was on that roof that collapsed?

 

[dtuuri]

Here where I contemplate placing the carport the experts used .15 gram per cu cm for snow density. They figure 30 psf for my site "ground snow load" (see fig 5). Apparently the local codes are for 30 psf roof load, which is overbuilt compared to climate data (the same as a nominal 42 psf ground load). Interesting calculator, btw:

http://www.had2know.com/househome/roof-snow-load-calculator.html​

dtuuri

 

[timwinters]

Your figures show CUBIC feet... Not Square feet...

Okay, then, tell me how to weigh a square foot of water that has no depth. It's kind of hard to weigh something that has no volume!

 

[JB1842]

Boy howdy!

I spent a few years working in the Clevelnd area and I was amazed at the difference in average annual snowfall from Sandusky to Ashtabula!

I grew up in the city directly east of Sandusky. We are on the southern most point of Lake Erie. If the winds are blowing from the west, we don't get the moisture accumulation that causes the lake effect snow.

 

[dtuuri]

I grew up in the city directly east of Sandusky. We are on the southern most point of Lake Erie. If the winds are blowing from the west, we don't get the moisture accumulation that causes the lake effect snow.

Site of potential carport right now:

Not snowing in Sandusky.

dtuuri

 

[timwinters]

I grew up in the city directly east of Sandusky. We are on the southern most point of Lake Erie. If the winds are blowing from the west, we don't get the moisture accumulation that causes the lake effect snow.

Exactly! It's all about the direction of the winds producing those lake effect snows. The average annual snowfall amounts get deeper the farther east you go, culminating at Erie & Buffalo.