Why not just bring your own ladder to get up to the roofs? If your ladder is long enough you can usually be at the top of the ladder before anyone has a chance to attack it, as long as you start walking up it as it is deploying.
It would be cool if there was a new item like reinforced metal ladders implemented that can only be destroyed from the ground. I imagine you could just reskin the ladder and make it only destructible at the bottom.
Another, idea more consistent with history and immersion is having stand-alone ladders (german origins, I think) that dont have to be propped on the side of buildings.
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loginIf properly placed, archers won't be able to destroy these as they would be out of reach.