We are about to build a custom home in Houston TX. To save money we have decided to use hardy board on the entire exterior instead of brick. I am concerned about mold. On a brick exterior you put weep holes to ensure normal moisture has a way to escape. What does the work of weep holes on a hardy board house. I have asked a couple of installers and the Hardy Board sales tech. and have yet to get the same answer twice or an answer that makes any sense. Thank-you for your time.