Because the garage door is often feel, many builders prefer to upgrade to an insulated door even where energy efficiency isn’t an important consideration. Inexpensive insulated doors often make use of the “laid in place” method, in which sheets of polystyrene foam are placed in the hollow steel pans and backed with a vinyl liner. Better-quality insulated steel doors use what’s sometimes called “sandwich construction”: Both the inner and outer faces of the door are steel, and the EPS panels between them — which are molded to conform closely to the shape of the steel skin — are bonded to the steel with adhesive. In addition to providing better thermal and sound insulation, the bonded foam also dampens
