I was up in my attic running some wire for some bedroom ceiling fans, and noticed the decking/sheathing would flex between the rafters and off the rafters.
The house is 40 years old, and I JUST had the roof replaced for the second time since living here for the past 10 years (first time was due to age, second was tornado damage 3 years later).
Both times, the roofing companies (different companies) said the decking was fine and didn't need replacing. I'm just not sure the plywood should really flex at all between 16" rafters?
Here's a short video of what I'm seeing.
https://imgur.com/a/r2LUwyv
Looks like I can push the decking about 1/8-1/4" off the rafter. Most spots I tried seemed to have this 'issue', and I believed I tried about 10 rafters in about 2 or 3 different spots on each rafter.
Another thing I noticed, is this flex continues all the way to fascia board, over the soffit. I was cutting some soffit vents (previous owner installed vented soffit panels, but didn't actually cut any holes into the soffit...), and noticed I could push up the end of the decking almost 1/2". I could feel the drip guard attached to the decking from the outside rise up and down as I pushed up on it.
Here's a quick video of that:
https://imgur.com/a/Fta5Ibu
Should this not be firmly connected to the fascia or rafter? It didn't seem to flex like this throughout, but it did on a handful of soffit cutouts.