The methods mentioned above for attaching shade cloth to the top of your pergola would still be valid for canvas materials making it suitable for heavier rain as long as there is enough slope to ensure they drain.
Reverse slope arbor roof.
I found three different methods for attaching the cloth that if the whole roof structure of the pergola has a slope would still work.
They also come in 12 lengths if you have a bigger roof to cover.
The roof structure is considerably slanted downward to create a slope towards the end of a pergola.
Horizontal plastic closure strips these attach to the top of the pergola to hold the roofing panels on since they should be installed every 2 feet you will need about 5 for every 8 length of paneling.
Clear roofing panels i used the suntuf 26 x 8 panels.
The gentle slope of a hip roof with its trapezoidal sides and pyramid like elegance is a graceful traditional design that pleases the eyes and can be constructed in a combination of various unique styles.
A gable roof is shaped like an upside down v and is sometimes referred to as a dual pitched saddle saddleback or peaked roof.
And being able to see the sky through the roof is so beautiful.
I seriously cannot wait for a rain storm so we can sit under the roof and watch the rain drops dance on it.
The clear pergola roof still blocks some of the sun about 10 so the patio still feels cooler than the non covered area.