With the Dynamat installation complete, I moved onto installing the Dynaliner. This is an ultra-lightweight insulator designed to be used on top of Dynamat, with high heat blocking properties. It is available in 1/8-, 1/4-, and 1/2-inch thicknesses. I used the 1/4 inch on the underside of the roof, as recommended in the instructions. For a foam-type material, Dynaliner is easy to cut with a razor knife.