Hi guys, I'm sure your helper Bradley knows about this. But I found out last year and thought I would tell you. The great guys at AceHardware told me about the screws you use for putting on the tin. For a roof or walls, whatever. I don't really remember which type they were but I think they were the green coated screws. They said they had some tin put up on a building they had made. But the contractor was putting on the wrong type of screws, when they checked on his progress they seen his error, the screws were there less than a week and were already coloring. He removed them all and replaced them with the type they told him to use. I wish I could remember what they were called. Anyway, just a heads up, maybe you might give them a call about it. I always take forever on my projects because I double check everything, I want to do it right the first time. Good luck on your projects.

John --- We use roofing screws on metal roofs. They come with a little gasket on each one so that the hole created by the screw doesn't cause leakage down through the roof. For this job, Bradley actually picked up the screws from the same place that cuts the metal, so I'm pretty confident they're right.

I'm not sure about discoloration, though. That reminds me more of the distinction between screws used for treated and untreated wood.

Anna, those screws sound right. It's usually a hex type head with a neoprene washer and the tip is a sheet metal style to drill through the metal. Only difference is if they are short (panel laps) or long (panel to structure screws). Which basically he knows what to use since the short ones wouldn't reach and the long would.

Marco --- I haven't actually seen our screws yet --- they're still in Bradley's car. I'll take a look on Monday when he comes back and starts putting the metal on.