Butt Gaps: Not good for any of us.
The more I inspect, the more I respect the challenge of constructing a home. Products, codes and best practices are constantly changing. Each system requires that the installer understand how it works. The slightest error gets compounded when it's repeated with a thousand parts. Partial knowledge is always dangerous, thus I always try to remain humble and ready to learn more. Cement fiber board is a wonderful invention developed in Australia were wood is dissolved readily