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Franklinton, LA | I built a little shed for the old pickup in 2004. Based on this experience, I am going to suggest a metal roof. I would suggest removing the old shingles and checking the condition of the plywood. Do you have any rotted spots that need repair? Should you re-nail a few spots? I would then use 2 1/2 or 3" deck screws to install 1 X 4 lathing, 24 or 32" on center over the plywood. The deck screws should be screwed into the rafters. You can then install the 26 gauge metal roofing over the lathing. Like other posters mentioned, install the screws in the flats. You can remove a 5 - 6" wide section of sheathing where the drop shed joins the main roof. The end of the metal drop shed roofing panels can be turned up at least 2" and extended under the more vertical sheets of metal. It will be best if you can caulk this seam from the inside. If you look closely at the attached photos, you can see that a 12" wide transition strip was installed where the two top sections of roofing join. The end of the roofing panels were turned up where the ridge cap was installed. Also, note that a cap was installed over the edges of the roofing.
On August 29, 2005 this barn took over 4 hours of 90+ MPH wind and over 8" of rain during Hurricane Katrina. The barn and roofing were not damaged but I did have water blown in around the windows. Also, I had some water blown in where the sections of roofing join. I have not had any leaks during normal rainfall events.
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anyone done a gambrel style barn roof in metal
