The Rain Guard is a good solution for keeping some sunlight coming through your pergola roof while also making the pergola rainproof. The thick polycarbonate is long lasting and can be adopted to any size and shaped pergola. Here are some example photos of flat and arched pergolas with rain guard.:
Rain Guard for Arched Pergola
Rain Guard for Arched Pergola
Rain Guard for Arched Pergola with Lattice Panels
Rain Guard for Arched Pergola
Rain Guard for Modern Louvered Pergola
