In Pennsylvania the following items are required by state law. A certified mitigation individual must either visit the home, typically as part of the estimate, or must be present at the initiation of the mitigation installation. A mitigation certified individual must inspect the completed system if the original mitigation system designed by the certified individual is changed. At least every fifth unchanged mitigation job in PA must be inspected by a mitigation certified individual. A homeowner however can always install his own mitigation system. I recommend you visit Infiltec to obtain your mitigation supplies and general installation information if you wish to tackle the job yourself.