Tin Roof Condensation

13 days ago

I installed a lean to on the side of my garage last fall. I used treated 6x6 for the posts. Everything else is standard construction pine (not green treat). Now that the snow is melting, I noticed some condensation underneath the tin panels. Is this common? Do I need to worry about rot long term due to the boards not being green treat? Should I take the tin off and paint the non-treated boards? The first photo shows the condensation under the tin. The second photo shows where the snow is on the roof when the condensation is present. Thanks!

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