No, the overall design is not up to the engineer. The owner who is paying for a building (constructed legally) has to conform to local buiding codes. Those codes give minimum requirements.
The owner can then opt to only use minimum, or pay some extra bucks for something that is stronger and safer. Right now, the minimum is 60 lbs. per foot in my town, and 80 lbs. per foot at my Adirondacks property. That being said, I've never built with less then 100 lbs. The cabin I just built in the Adirondacks it 140 lbs. per foot. I did that because I don't go there all winter and won't be there to check snow on the roof.
So, at the outset the design choice is up to the person paying for the building - and NOT the engineer.
The engineer is simply given the task of - designing a building to handle X amount of wind load, and roof weight load. That's all. The engineer can decide what design to use only withing the demands that are asked for.
Subsquently the engineer is blameless - unless he designs an 80 lb. roof and it comes down with 60 lbs.
Back to codes, they usually do not take snow-buildup over time into account. Just worst-case scenario for one storm at a time. Now, a code-officer CAN take those factor into account. Officers are given a lot of lee-way to change code when needed.
On the same suject, I have to laugh when people build in "100 year flood-plains. Then get flooded out 2 years later and complain. They don't seem to understand that "100 years" means it can occur anytime - not just 100 years from "now."
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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