I cannot say enough at how much a difference it was when we thinsulated my roof. Was huge for this super cold, curious as to how it will do with the very hot days. I can make it almost all the way to work and there will be frost still on the top because most of the heat from the cabin did not make it up. Did insulating the roof help with road noise or just help trap the sound in the car? I believe my next step is going to be filling the a-pillar base with expanding foam. I think there is alot of road noise traveling up from the front fender through the open camber inside that area of the car body. It did help, yes, but there is also 12 CLD tiles up there too. This is my first non-sunroof car I have owned, so a long un-interrupted surface on the roof can act as a source in a way. From a semi-psychological stand point, all the work done on the car with SDS that caused such good isolation from the outside, really makes the inside feel more cozy and welcoming. Not sure how else to explain it. It is all totally hidden, but when there is so much less presence from what is around you, there is a feeling of being wrapped up in the car. Kind of like a really warm winter jacket. Similar, but different in a mental way from the sled, as it was a big heavy vault like sleeping giant. Background noise is cold I called up Don no less then 48 hours later and told him I have yet to have to turn my heat up past, wait for it.... 1.