The "sheds" pictured above in my post were all originally supposed to be temporary. The blue tarped one truly was - being up and in use on that rented property from 5 November 2014 thru 19 January 2015 - when we brought the last load of ponies from the rented property to our new 21 acre site.
The ones for the boys and for the girls pastures were tied with haystring and tarped and we plan on going back and leveling those walls and bolting them together (as demo'd in the Wood Pallet Shed Project), putting the panels up permanently with staples or u-bolts or ?. Then plan on putting a solid roof on - have been looking at several different materials and haven't decided on which one(s) we may be using at this time. It's now been two 1/2 years! They've withstood up to 3" of heavy, wet snow several times, several freezing rains w/ over 1/2" of solid ice layered on the tarped roofs and the rain deluge (11" w/i 8 hours) and sustained winds from Hurricane Matthew in October 2016...
One of the 3 chicken coops needed a tarp replaced (it was previously used) and the boys shed has been thru 2 tarps - that first green one a well used, but free one from Craig's list and lasted most of 2015. Then 2 went up on it after that (both too small to cover it by themselves) - that doesn't work so well but it did survive Hurricane Matthew only to "die" sometime over the winter. Since we were going to put a roof over the panels, I never re-covered it! I just moved stuff around so that the weather doesn't matter to what's stored (no actual pony equipment or baled hay) ...
The girls' feed room is still using that oversized silver tarp - but the cats have done their work well (they think it 's their personal jungle gym or napping spots) and if you look up you can see a "starry" sky. I'm hoping it holds a bit longer - think we will be putting up this product -
Solexx XP 3.5mm