To me, Bill Rose has single handily written the most about historical forensic building science and analysis that explains why we build things the way we do. This historical perspective reveals why we have wrongly and myopically focused on class one vapor retarders to stop vapor diffusion when we should be focusing on vapor transport through air leakage, for example. I feel we can’t loose this historic perspective if we want to move forward with making applied building science part of everyday building. Thank you Professor William B. Rose for all that you have brought to light.