This can be from two causes.
Gable roof no overhang.
Uplift of roof decking at the overhang.
The biggest problems with gable end overhang strength occur if your roof overhang is greater than about 12 inches.
Warming trends in january and again in april cause the roof strate to warm and evidently i had condensation ptoblrms no soffit vents but do have small gable end vents.
With the west east overhangs the main use is siding window protection and keeping rain snow from foundation.
Also note that a new fully adhered membrane is installed on the original roof deck replacing the one installed 17 years ago is folded down to catch the top edge of the wall water control layer.
With our house we are planning minimal east and west overhangs and ample south and north overhangs.
The other common wind related failure at gable ends is uplift of the roof decking at the overhang.
We will protect shade the west windows with cedar awnings grates.
We love the look of the no overhang scottish style roof line as well.
However for larger extensions you ll need to hire a professional to get up there and remove large portions of the roof before extending the overhang.
Over roof insulation the gable overhang has been cut flush with the wall sheathing.
I reshingle this past year and pulled out old r14 insulation and retaped as many as visually possible areas of vapour barrier leaks cuts in material etc.