I’ve been successfully hanging drywall for nearly three decades, but when work started slowing down a few years ago I decided to add home-performance contracting to my business. Getting trained and certified felt like a logical step, since drywall work directly involves the building envelope. I also do a lot of insulating (which is common for drywall contractors in my area).Originally, I just wanted to increase the scope of services I could offer my clients, though I also thought that the added knowledge would give me an edge over my competitors when bidding drywall jobs. My hope was to derive...