Flexitec is one of the easiest sheets goods on the market to install. Any installer that can install sheet goods can install Flexitec. There is no actual certification program for it so there will be no certified installers. Basically make sure to get a copy of the installation guide with your Flexitec purchase or download it from their website, www.ivcgroup.com and make sure the installer familiarizes himself with the instructions. The major difference is how the glue works.