Headliner Insulation..???
would dynamat be acceptable to use on the roof?
I dynamated my 70's roof, and then put the double foil sided insulating blanket ( available at Speedway Motors or Aircraft Spruce) on top of that. I use use that aluminum, wax paper backed foil duct tape along the edges and any seams to hold it up there.I have a black perforated headliner, and the foil doesn't really show through the perforations.
I used the same technique to cocoon the entire interior from the windshield to the rear window and up both sides including the doors.
When I get in the car and close the door with the windows closed, it sounds like I'm sitting in a bank vault. The car is quieter than a Bentley going down the road. An added benefit is how much cooler it is in the summer. It also keeps fumes out.
Dynamat or Fat Mat is really only good for stopping the resonation of the panels. It will still transfer hear through, as it just takes more time. It's the foil back jute that really does the heat, sound and fume rejection.
I learned about this technique when researching how to insulate small aircraft. They also recommend only using Dynamat in strips to reduce overall weight. It still does a great job of dampening panel resonation with the surface only half covered using strips of material.
