Been a carpenter/contractor for over 27 years and do many metal roofs on houses every year..The biggest issue with leaving existing roofing on and putting fir strips then metal over is the weight of the roofload..for those that live in snowless areas this may not be a factor..i personally wont put metal over more than 2 layers of shingles due to added weight.
Every manufacture i have installed metal for requires screws on flat as screws on rib will push metal down without hitting resistance from flat surface therefore not allowing solid contact of screw and washer.
I prefer to tear exiting roofing off, but if homeowner is trying to save money, then i use 2x4 with 3 1/2 stainless screws.
Keep in mind that when putting metal on wood sheeting without a 1x or 2x there is no space for the area between metal and roof to breathe. Metal does sweat and causes condinsation and moisture so the space caused by firring strips allows air to circulate.
Good luck..most important ghing is to keep weight in mind.
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