East walkway cover lasted 20 years.The amount of dirt on the roof is an indication how dirty the air can get. The fabric which provides shade can collect plenty dust.
The main problem with plastic roofing is birds. They seem to peck on plastic as if they were seeing worms. 
Next step is to remove and replace the roofing. I'll be using tin. Expect it will take a few weekends.
สกลนคร Sakon Nakhon
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