Due to some of the manufacturing processes that Titus uses, Titus does not use recycled steel or aluminum. LEED states that mechanical, electrical, and plumbing (MEP) products as well as labor, overhead, and fees are not to be included in calculations for the Regional Material and Recycled Content Credits.
The reason for excluding MEP products is that typically, MEP products are not recycled or reused, which is the focus of the Material & Resources section of LEED. Including MEP products would increase the total material value of a project while not adding value to the total recycled or reused material content, and, therefore, make it more difficult to achieve the 5%, 10%, or 20% necessary to achieve some of the Material & Resource Credits.
Although the Credits state that MEP products should be excluded, they may be included in the calculations if desired. However, the same total material value must be used throughout the LEED credit calculations, so if MEP products are included, they must be in all Credit calculations.
Titus Material Documentation