Did you ever notice how fast things get off track here. Ia Gary's got it right. Been contracting for 25 yrs and grew up as a farm kid. There's more than one way to skin a cat. If you are over laying your purlins there is really no need to go 2x4 if your existing substraight is good. Space those at 2' centers or less if you like. More will promote kinking of the tin even as you are working on it. It was never clear as to what snow load, if any you have. A facia board is an easy add depending on what you want, but not necesary. You mentioned rake trim above and your facia could be as simple as that in itself. Caulking the lap joints is a good idea. Steel ridge with closer strips is probably your best option. As far as fasteners, screws are probably the most common but there are good r/s neo nails on the market. I've had suppliers figure short screws all around. Make sure you're comfortable with the fastener length. Generally the tin hangs over the facia by 2"-3". More will lead to kinking when those February icicles come 'round.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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