deterioration rate outdoor vs uncovered

[lode]

Crashlanded starts with logs scattered showing deterioration rate being influenced by Outdoors, Uncovered. When I inspect the info panel for a pile of wood, i base 0.50 and current 0.50

When I build some columns and cover the wood piles, it shows deterioration rate being influenced by Outdoors only, and when I look at the info panel it is unchanged.

I understand Outdoors is "bad" (max base det. rate?) and being rained on is "worse" and indoors = no det. rate, and Uncovered is "somewhere between indoors and outdoors" and still "bad, depending on what it is maybe" but for the love of all that is holy and pure is there any definitive explanation for how deterioration is intended to work on *any* quantifiable terms?  I'd like some way to know what det. rate risks i am taking on when using covered instead of indoors.

Thanks to anyone who can help. Also special thanks to Tynan: as a Pirate King, 1600+ hr player who started my knee-high ADVENTURE! in games on an original Pong console and who later was one of a privileged to first play Zork (and rogue!) on dtcs1, to say nothing of the years since, my life as a gamer is replete with OG e-peen bone fides and I say this to you, sir: this game is a beautifully crafted masterpiece and I cannot thank you enough for having made it. Bravo !