Composite board containing glass fiber mat

A composite board comprising:

• at least one glass fiber mat having an upper surface and a lower surface;
• a foam layer attached to the glass fiber mat;
• and
• a first binding composition applied to the upper surface of the at least one glass fiber mat which penetrates into the glass fiber mat beyond the upper surface, and a second binding composition applied to the lower surface of the at least one glass fiber mat which penetrates into the glass fiber mat beyond the lower surface, the first and second binding compositions being the same or different compositions, and the air permeability of the at least one glass fiber mat on which the first and second compositions have been applied is such that it takes at least 300 seconds for 300 cubic centimeters of air to pass through 1 square inch of the glass fiber mat.