You might look at the http://www.tarei.com/ website. I also recommend you use someone at the professional inspector level.
You can also see info on the TREC website at Paths to an Inspector License - There are three levels of inspector licensure: Apprentice Inspector, Real Estate Inspector, and Professional Inspector. To obtain a Real Estate Inspector or a Professional Real Estate Inspector license you have a choice of two paths: the Three-Tier progression, and the Education/Experience Alternative...see more. http://www.trec.state.tx.us/inspector/