The seam cracking in lanai's is caused from movement. It happens in the garage too. All the screws and drywall compound in the world won't stop it. My in laws lanai has vinyl and I think it looks lots better than my cracked ceiling lanai plus you can pressure wash it.
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"I am a great believer in luck, and I find that the harder I work, the more I have of it." -Thomas Jefferson
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