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If you are unsure check with the BBB. your state licensing board, and go look at several references where they have done instalations. Talk to the owners if you can and see how they were treated. These three things should tell you a lot about who you are dealing with. also have them give you the name of the brand of cement board and have them describe exactly what they propose to do. also look to see if one is prefinished and one is not. Prefinished are more expensive Good Luck.
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