There are some 2×4s stacked neatly in the big pole barn. Dad put some kind of covering on them - has grit like shingles on one side but on a roll, then he put metal roofing panels on top of that, and then wood has been thrown on top, probably 3’ of boards (every size), fence posts or more. The loose boards on top are often warped, even though they don’t get rained on. I NEED 2 x 4s so I want to get those covered boards out, but it’s impossible without moving the major loose board pile. I don’t know how long the 2 x 4s are either, probably 6’, but 8’ would be nice. Too much more important stuff to do now, but I’ll eventually bite the bullet & start moving wood.
Roll roofing/shingling, comes three foot wide. Not much of a thing anymore but it was fast and cheap and with enough tar, was the only DIY way to do a flat or near flat roof back in the day. Not pretty but worked.
I spent my youth shoveling snow off our flat roofed carport up in Massachusetts. The instructions were; don't scrape it down too hard and take the grit off. Start around the edges and work towards the middle.(to get weight off the roof first thing) My dad has me do it because I was lighter and he was worried about the old structure collapsing. Also had to get it done before it was much more than 6 inches of snow. Not sure how many times I did it during the blizzard of '78 when we got 3 foot in 2 days.
And many a shanty has had roll roofing on top of rough sawn oak with gaps as siding. Do what ya gotta do to keep the wind from blowing through I guess.