Nice looking new tunnel your building. Sure will be something to see when you finish it. : )
Besides the bracing, how do you plan to keep the snow load off. I know you said you would have your step dad go out and clean it, good idea, but I tend to agree with Helmann's that as that snow melts and refreezes that it will stick and not slide down. 17' that is along way up and a whole lot of room in a gh that size to try and heat.
Just out of curiosity, have you figured about what it would cost to cover your new tunnel yet?
What do you call them braces on the one pic that have the flat ends to them?
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