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I assume that when you say 1x6's 4" apart, you're referring to perlans. I would put insulation (foam) between them and the perlans to keep condensation off of them so that they dont rot. I'm sure that it will deaden some of the noise that the rain is going to make as well. 4" apart is pretty close, but they are 1x6's. I have to figure that at that close, is going to be a pretty rugged roof. I've heard some here say that the rubber gromet metal screws to hold the metel down will leak within a few years. I've seen metal roofs on homes from the '50's that are still there and don't leak. Has to be quality metal, and I'll bet a lot noisier during heavy rains. Obviously duarable. I'd go with a screened peak cap the length for ventilation with vents in your soffets. When I did my barn and tool crib, I rolled out 24" wide 1/4" square fencing, galvanized screen over that, then another layer of the fencing before I put the metal down, leaving a 2" gap at the peak, then put peak caps the length of the peaks. I did the same for the soffets, 6" fenced/screen/fenced opening the lengths of the soffets. Birds and bugs don't get in, and both are cool in the summer. And while you have it open is the best time to add or replace the batting lying on top of your ceiling (plenty for heat, cold, noise) - cheaper and easier now than later. Mark.
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