Things that affect noise volume
A factor that can affect the noise level of an aluminium pergola in the rain is the size of the roof. A larger roof will typically be louder in the rain than a smaller roof. This is because a larger roof will have more surface area to be hit by the rain.
Another factor is the way the louvres are built. Imagine tapping on an empty cardboard box, compared with a full one. It makes more sound. We're pleased to say that each galvanised steel louvre on Proteus pergolas is made from a single piece of profiled metal. This will reduce resonance.
One thing to keep in mind is that, even though aluminium pergolas are generally not loud in the rain, the sound of the rain hitting the roof can be amplified if the pergola is located in an open area. If you have a pergola that is surrounded by soft landscaping—trees and bushes—you may find these muffle the sound of the rain, making it less noticeable.
If you're looking for an aluminium pergola that is both stylish and functional, and won't be too loud in the rain, consider the Proteus Aluminium Pergolas from London Stone.