Then screw in the screws with rubberized washers using the socket bit. For the closure strips that are in the middle of your pergola roof, put a screw in every third raised section.
You can put them down right over the top of your pergola like a roof.
How to waterproof a pergola roof. And if you don’t need the shade but still want to stay dry, you can even install clear ones, like i did over my outdoor bar. Like the tin panels, installing it on a bit of an angle will help the water run off. The washer should be resting firmly on the plastic roofing panel, but not tight enough to cause a dimple in the panel.