The reason I contacted IAQS is because I had an issue with foam insulation installed in my block walls. We noticed that there was NO foam in the block! After some research I contacted John. His credentials are impressive and his knowledge extensive. He was happy to come out and look at the foam insulation at my house. He made recommendations and educated me about foam insulation. Moving forward with the foam insulation, I was able to talk with my insulation contractor and express my expectations. Knowledge is power! Thank you John!!