R3.3 rigid foam board insulation.
Just one 4x8 sheet by a ½" thick did the trick. There were some bare spot along the edges . But this wasnt that critical, just a little something compared to the nothing it had before. Helps with stiffening up the whole roof and even a bit with sound.
![](https://uploads.tapatalk-cdn.com/20200328/f90944d4c9e1bf64e7c8275c827a1a1e.jpg)
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