Quote:
Originally Posted by skip0358
Also these cracks appear because the ends are butted up and there is no 2X4 or 2x6 where the end joints butt so it's going to flex a lot more. Mine to were repaired under warranty and they're back yet again. Lanai, Garage and a small section of the living room.
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Drywall is tapered at the edges. This creates a valley so that you don't end up with a bump when you fill in the crack where the sheets butt together. To do a quality job I.E. no bump you need to use a technique called a rock splice to strengthen a non supported seam. Quality builders do this all the time especially with long seams like in a Lanai. The local big box stores sell these splices.