We had a fairly large canvas covering installed about 3 years ago ~900 sq. ft. It's fantastic for shade and light rain, but in heavy rains, the canvas saturates and starts to leak. We also have several areas where we always get a small leak during a constant rain.
When our canvas wears out, I'm going to look at SIP (structural insulated panels) panels to replace the canvas and aluminum structure. I've heard others that have had these installed and have no leaks. It's more money, but worth it to me.
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