I contacted Mark due to the high rating his company has received on Homestars. Initially the conversation was about a very cold master bedroom that during the winter was about 7 degrees colder then the rest of the house, and a breeze coming from my house bay window. I had read about the wall injection procedure and thought it would be a good idea to resolve the problem. Mark had asked to see my attic where he said additional insulation there may be my best bang for the buck, I had this done in 2007 and didn't expect any issues, but Mark identified that the R value was not as high as it could be, and that the previous contractor hadn't filled along the roof perimeter very well, and in fact was likely missed entirely in places. That was enough to move forward. His employee Charlie arrived promptly at the agreed start time and did prep work until Mark arrived shortly after, the work was done quickly and professionally. In the few days that have passed since the install our home seems to be more uniform in temperature which was not the case before. I am looking forward to a winter without having to use a space heater to make the room temperature tolerable. Thanks Mark I will definitely recommend your company to friends and family.