Tip
If the structure is not sloped, you can use this installation to create the necessary slope. Run rubber bands from above in one side and from below in the opposite side. The slope will allow proper runoff and thus avoid the formation of annoying water stagnation.
You can attach buttons to the top or side of the perimeter beams and run a bungee cord between buttons and eyelets, creating a zigzag effect that provides strength and tension. Pay attention to the tension applied to the elastic cord so that it is even and sufficient to keep the sheet firmly attached to the button even in windy conditions.
In the case of metal pergolas or those with beams that are not particularly bulky, you can use bungee cord to be passed around the beam and through each grommet. While this solution may be more aesthetically pleasing, it is less practical if you need to remove the eyelet sheet.
In the case of pergolas with tubular frames or particularly thin beams, you can use common electrician's ties to be passed around the pergola tube and into each eyelet.
All of these types of applications are suitable for wooden or metal arbors.