How to stop a creaking roof?

Well Joe--hopefully you don't have a structural problem or more then two layers of roofing up their---Go in your attic with a flashlight--look for gaps between your rafters and sheathing--if you see any and can move the sheathing that can be the cause--a rafter may have shrunk or bowed. You can take the easy way and jam shims in their--or go up top and drive screws under your shingles into the rafter. if you see any thing that split or looks dangerous -get a Pro.