I'm planning to build a relatively large wooden pergola of about 4 meters or 13 feet wide per 7.5 meters or 25 feet long.
I'm not planning to add a roof or extra crazy load to it.
On one end I'd like to attach the pergola to the wall of the house, on the other end wooden posts.
Because I would be using 4 meter / 13 feet long rafters, do I need some intermediate support between the wall and the beams? What would be the recommended dimensions for the rafters section? I would prefer not to angle them.
How many posts should I use and with which section? What would be a safe beam(s) size?