1 metres
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You should normally have three rungs(steps) past the surface you are climbing to from the ladder. They are a foot apart on most ladders so 15 feet would be close. Add a foot since you have to angle the ladder appropriately(scope) so 16 feet or longer is safe. A 20 foot extension ladder would be a good choice.
13.6 feet
It can mean the height from the ground to the roof peak, or the ground elevation above or below sea level.
The frame should be checked prior to the rafters going on. Once the roof is on , you will just have to deal with what you have. The horse is out of the barn...
The rafters carry the dead load of the sheathing and roofing material, and the live loads above