Gamco Corp.’s new CW250P, the improved version of its 2 1/2-inch sightline aluminum curtain wall system, provides significantly better thermal performance than its predecessor, say officials. Utilizing a state-of-the-art polyamide structural pressure bar that creates an effective thermal break, the new curtain wall delivers 20 percent U-value improvement and, with certain insulating glass packages, is capable of U-values as low as 0.34 or 0.21.