Ask how many houses they have tested according to proper protocols. Experience is more important than length of time in business. E.D.I. was established in order to train and certify inspectors in order to raise the quality and consistency of EIFS inspections in the country. They are the only source of certified third party EIFS inspectors that has been approved by BOCA, which is one of the three code bodies in the United States. Construction knowledge is critical to making successful recommendations.
Some companies refuse to testify in court.
You may well need this service. If your tester is not willing to stand behind his work in court, you may have to re-test using a company that is willing and more importantly, qualified to provide expert witness testimony. Although it is tempting, do not hire companies that offer to repair the problems. They may overstate the amount of work in order to increase their fee. Many installers have branched out into the testing business.