@MGilcthis might be not accurate to your situation as I dont have time to read all the posts but I thought I share my experience. If you have gable roof and want to offset individual components from all edges then I would definitely go for slab with drainage settings applied. It might sound scary at first but it really works. Here is example of two slabs forming gable roof, one with big openning to accomodate staircase. 119% = 45 degree slope  
    • Love
    • Like