16 x 16 cabin. 45 degree roof pitch. 5/8 plywood roof sheathing, tar paper then horizontal 1″ x 4″ x 8′ boards 16″ OC, then metal roofing screwed on top. The 1 x 4″ boards will overhang 11″, and the metal roofing exactly 1″ beyond this (acting as a drop edge) – so total overhang is 1ft.
Im mostly using the 1 x 4 boards to simplify the overhang, without creating a complicated fascia board / ladder overhang with me awkwardly laying 16′ in the air hanging over the roof edge.
Instead im considering just scrapping the 1″ x 4 boards and just overhanging the plywood 11″.
Would this work? Or would it be too flappy? Considering it would be an entire plywood section im assuming it would be stronger then 1 x 4 boards 16″ OC. Actual 1 x 4 boards are 3/4″ thick.
I originally got the 1 x 4 overhang idea from this video: https://www.youtube.com/watch?v=RexXz8JVGnA
Thoughts?
Replies
Try not to get your building advice from U tube videos.
Details matter, so start with the roofing you want, and check requirements for that roofing. some requires a solid deck underneath, some let you install on purlins.
Last time I checked, 2x4 were less expensive than 1x4.
Considerations for overhang structure include not only stability without any loads, but how they stand up over time when snow builds up, or when someone has to get on top of the roof. How this detail reacts with wind loading is another concern. Last thing you want is a high wind that peels off the roof decking.
One other thing to consider is paint adheres to 1x4 better than plywood and if there is checking of paint, you can sand 1x4s for new paint better than plywood.
Omit the plywood and expose the under side of the metal. Much more interesting.
Thanks for the suggestion, I will keep it in my mind.
Plywood on the overhang needs to be CCX or better