52 hyperbolic paraboid concrete umbrellas form the roof of a 105,000 square foot warehouse recently completed for Goodrich Chemicals in West Virginia. Even though many construction days were lost due to a late spring time was saved and made up due to the original design concept, cooperation among developers and ingenuity and know how on the part of the concrete contractor. The warehouse was designed by Triggs and Mellett. Multiple 45 foot square hyperbolic paraboloid umbrellas were selected by the engineers for roofing this structure for two reasons. One, experience led them to anticipate construction and material economies through the use of the warped, thin shell surface, and two, the use of centrally supported umbrellas would allow greater clear span between supports and thus afford greater flexibility and more usable floor space.