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What are these roof pieces?

R

Royse

Well-known Member
New building going up near me. I noticed these pieces standing near the eave.
Looks like they might deter snow from sliding off.

mvphoto68612.jpg
 

Interesting screw down pattern.

Those look as if they are to try keeping the snow from sliding off.I
Are they V shaped?
I have seen shark fin shapes to break the snow and ice before it comes off in one huge hunk.
 
Is it better to keep the snow on the roof until it collapses or to let it slide off as an avalanche that might bury you?
 
"Interesting screw down pattern."

Yes, the difference in screw spacing and straightness of the rows had me wondering a bit too.
 
It's best to build the roof strong enough to support the most snow you might ever get in your area! I built our buildings with a 5/12 pitch thinking the snow would slide off, but it doesn't, it stays there until a warm day in the spring and then all comes off at once. So, then I put a snow bar on to hold the snow from sliding, that is what most people do in our area. You can see the snow bar on our cabin roof, with a tractor in front!
cvphoto71831.jpg
 
Yea, I understand over a door, but seems odd to want to keep all the snow on the roof from all winter until April.

I’d rather use the asphalt and rock covered metal shingles then, so the snow has a better chance of slewing off and melting off over the winter.

Paul
 
I can see a big problem with those. They will keep the snow from sliding off & it
will build up all winter. The roof is built for the snow load. What happens when
you get a couple of inches of rain too? The roof collapses!
 
Snow will melt when the sun shines. I see the roof does not have eave troughs. If the snow slides or creeps down in large pieces it can tear off the eave troughs if installed.
 
I put a shiny new steel roof on the barn probably 30 years ago. 27 foot sheets. First winter after a big snow I walked out a barn door and slammed the door behind me. When I slammed the door I heard a hissing sound and stopped to figure out where it was coming from. Well it didnt take long for me to figure it out. Got walloped with snow off the roof. I did not have my hood over my head so some of it went down my neck. After that incident I noticed the hogs would go running away from the barn when they heard that hiss. LOL
 
I guess some people like to overload there roof.
I have seen a few buildings collapse because they ended up with 10’feet of wet snow on a roof
like that. Only took a 2 day storm and you couldn’t see 100 ft all day.
We ended up with 16 ft tall drifts about 75 ft long on our yard in that storm.
Was the first year we were married and wife and I dug a huge room into it over the next month
I have a 30x 68 house now with tin. I would never build in such a way that I hade to walk or stand
under that part of the building. Saves a lot of problems.
 
"I walked out a barn door and slammed the door behind me."

I have that problem with one of my barns too. Thing is, this new
building that's going up has a small porch type entrance with the
roof running the opposite direction so everything would slide off
the sides and not on the side with or over the door.
The dams are over the rest of the building.
Eave trough/gutters may go up later. I don't know what their plan is.
It's roughly 30 x 50 and the builder has been working on it most
of the summer. My 30 x 40 went up in a week start to finish.
 
Snow / ice layer will collect, then begin to melt and the water will collect underneath. Unpredictable, but the layer will
SUDDENLY slide and crash down, and can kill anyone underneath. Those things are life savers. Extremely important.
 


It appears that most responders in this thread believe that building designers, builders, building inspectors, building code writers have never heard of snow, LOL. I bet that they have. It is my understanding that those pieces, which are on pretty much all metal roofs around here are not to keep the snow or ice from coming down but to keep it from being in large enough sized pieces to hurt someone. They are installed mainly over doors and other places where a heavy fall of snow from the roof could be a problem. It is very rare to see any significant accumulation of snow on a metal roof around here.
 
Roof rotters. They hold the snow on the roof so the water will build up each night till the roof will leak under the seams and joints like under those dams then rot the roof out from water under the roof. I guess if you lived in the Arctic circle or some place like that then it would not be a problem till spring. Here in MI with all the freeze and thaw they would rot the roof out fast. Just like eve troughs will the water can't get away from the roof eave and them soaks in under the roofing and whla the roof is soaked up under the roofing whether steel or other material. We don't have any of that stuff on our roof. It just slides off out roof with a 12 12 slope or close to it. You can't stand on it very well. Your toes need to be in the cracks between the roof boards if you want to stay on it without a set of roof jacks.
 
here we call them snow brakes , made to stop the snow from falling down on a doorway , or garage door
 
(quoted from post at 19:23:18 01/19/21) I can see a big problem with those. They will keep the snow from sliding off & it
will build up all winter. The roof is built for the snow load. What happens when
you get a couple of inches of rain too? The roof collapses!
Click to expand...

So on an asphalt roof, there is ZERO chance of the snow sliding off, and the same thing happens! What's the difference?
 

Have to wonder what the design engineer and the installer were drinking to come up with that screw pattern? Looks like rafters on 8' centers.
 
(quoted from post at 22:23:18 01/19/21) I can see a big problem with those. They will keep the snow from sliding off & it
will build up all winter. The roof is built for the snow load. What happens when
you get a couple of inches of rain too? The roof collapses!
Click to expand...

Only here could folks try to find fault with something that's been used and proven for decades.

Put up a metal roof in snow country without those and see how long your gutters last. And just hope you or your kids are never near it when things start melting. The entire point is to keep the snow and ice from sliding off in one giant slab, which it will without those in place.
 
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