45° wouldn't work well with any overhangs which are not facing south - not when the goals is to put solar panels on them. And I, every winter, see snow clingin

45° wouldn't work well with any overhangs which are not facing south - not when the goals is to put solar panels on them. And I, every winter, see snow clinging to 45° roofs quite often. Slightly wet snow (also the heaviest snow) can even stick to vertical surfaces. 45° would also make an overhang more susceptible to wind forces, acting like a sail.