no ... he does not need to put anything under the tin. reason being there better be a vapour barrier in his ceiling to prevent any moist air getting into the attic from the house. Black rafters and purlins is not mold. the difference between a pole shed and a attic is a pole shed has ground moisture coming up and condensing on the tin. if it houses cattle all the moist air they breath and discharge also ads to moisture. if it is a machine shed in winter the hot air from sun shining on tin to cold air coming up from frozen ground makes a high tempt difference and may cause sweating on under side.in a house it only needs a little bit of vent and the outside temp to underside temp is not enough degrees difference to cause condensation. the other thing is where is the moisture going to come from to create condensation if it is dry in the attic.my house has tin and a only partial ridge venting and a few soffits. No moisture problems what so ever. it will probably out last me. NOW THE REASON FOR TARPS. could it be that he had hail ,maybe the original tin was nailed not screwed, or screwed on the rib instead off tight on the flat, maybe not enough screws. you never know. asphalt shingles with only half the nails won't last long either
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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